JP5362456B2 - Method of measuring litter flow in river, measuring device and measuring program - Google Patents

Description

  The present invention relates to a litter flow amount measuring method, a measuring device, and a measuring program in a river. More specifically, the present invention relates to a technique for measuring the amount of litter that flows by the flow of water in a river.

  Note that litter is a general term for falling leaves, falling branches, etc. falling from trees.

  The Kyoto Protocol adopted by the 3rd Conference of the Parties to the United Nations Framework Convention on Climate Change (COP3) includes the Clean Development Mechanism (CDM) as one of the Kyoto mechanisms. And, it is recognized that the fixed amount of carbon dioxide created by the project to secure carbon dioxide absorption source by afforestation and reforestation in developing countries is incorporated as a greenhouse gas emission reduction amount in developed countries using CDM. Based on this framework, COP9 has determined the rules for implementing CDM projects that increase carbon dioxide fixation through new and reforestation. Furthermore, as a methodology for small-scale CDM targeting afforestation / reforestation that can use simpler procedures compared to normal CDM, “a simplified baseline for small-scale CDM afforestation project activities in wetlands and "Monitoring methodology" has been approved. For example, a mangrove planting small-scale CDM is evaluated according to this methodology.

  Simplified small-scale CDM methodology related to mangrove planting / reforestation includes 1) carbon storage in mangrove trees (onshore and underground), 2) carbon storage in soil or sediment, 3) other warming Reference is made to three carbon storage pools with changes in gas balance changes converted to carbon. The scientific unclear matters related to these predictions and monitoring of mature mangrove forests are as follows: 1) Prediction of carbon storage above and below trees in mature forests, 2) Net production in mature forests and their Whereabouts, 3) Amount of branches and leaves (ie litter) falling into the mangrove flooding area for mangrove trees that are the main carbon dioxide absorption main body, 4) Decomposition rate of these litters in the mangrove flooding area and the amount buried in the sediment, 5) Decomposition rate of litter-decomposed organic matter and sediment organic matter particles in water, 6) Litter outflow and its whereabouts excluding decomposition in mangrove inundation area, 7) Elucidation of contribution of organic inflow from upstream in mangrove inundation area There are seven.

  In relation to 6) of the above seven scientific unexplained matters, mangrove litter transported to the coast outside the mangrove area by the flow of river water due to tides among the fallen leaves falling into the mangrove flooded area is within the flooded area Even if it does not decompose, it will decompose on the coast and eventually return to carbon dioxide, so in order to properly evaluate the amount of carbon dioxide fixed in the mangrove flood area, accurately measure the amount of litter flowing out of the mangrove area It is necessary to.

  Here, as a method for measuring the amount of litter that flows out of the mangrove area due to the flow of water in the river, for example, image processing is performed on image data obtained by photographing the river basin with a video camera (Non-Patent Document 1). ) To count the litter flowing in the river.

Tsutsumi Fujio and Tachida Satoshi: Automatic counting method by image processing of leaves flowing over river, Research Report R07002, 10pp., 2007

  However, when the amount of litter is measured using image data obtained by photographing a river basin with a video camera, the litter floating on the water surface of the river can be counted, but it is submerged in water. Since litter cannot be counted, it cannot be said that the amount of litter flow is measured for all litters flowing by the flow of water in the river, and the amount of litter flow cannot be accurately measured.

  Therefore, an object of the present invention is to provide a litter flow amount measuring method, a measuring apparatus, and a measurement program in a river that can measure litter flow amount for all litters flowing by the flow of water in the river. To do.

  In order to achieve this object, the method for measuring the amount of litter flow in a river according to claim 1 is characterized in that the litter and underwater that attempt to pass through the reference surface position while floating on the water surface of the basin at the reference surface position for counting the flow litter in the river The step of measuring the flow litter amount Lf by counting the litter captured by the litter capturing and collecting means and installing the means for capturing and collecting the litter that passes through the reference surface position while being immersed in the reference plane position. And measuring the total photographing litter amount La by counting the litter passing through the reference plane position while floating the water surface photographed in the image obtained by the photographing means while photographing the basin of the reference plane position. At the same time, it tries to pass the reference plane position while floating on the water surface captured in the image obtained by the photographing means. The step of measuring the partial photographing litter amount Lp by counting the litter captured by the litter capturing and collecting means, and the total litter amount L passing through the water surface of the basin at the reference surface position and underwater by L = Lf × La / Lp. And a step of calculating.

  Further, the litter flow amount measuring device in the river according to claim 2 is installed in the basin of the reference plane position for counting the flow litter in the river and passes through the reference plane position while floating on the water surface of the basin of the reference plane position. And a means for reading the flow retarder Lf, which is the amount of the litter captured by the means for capturing and collecting the litter that is going to pass through the reference surface position while being submerged in the water, from the storage means, and photographing the basin at the reference surface position The water surface captured in the image obtained by the photographing means while reading the entire photographing litter amount La which is the amount of the litter passing through the reference plane position while floating on the water surface photographed in the image obtained by the means The partial photographing litter amount Lp, which is the amount of litter captured by the litter capturing / recovering means trying to pass the reference plane position while floating, is stored. And means for reading al, have to have a means for calculating the total litter weight L passing through the water surface and water in the basin of the reference plane position by L = Lf × La / Lp.

  The program for measuring the amount of litter flow in a river according to claim 3 is installed in the basin of the reference plane position for counting the flow litter in the river when measuring the amount of litter flow in the river. Memorizes the amount of flow litter Lf which is the amount of litter captured by the means for capturing and recovering the litter that passes through the reference surface position while floating on the water surface of the basin and the litter that passes through the reference surface position while immersed in water The total photographing litter amount La, which is the amount of litter that passes through the reference plane position while floating on the water surface captured in the image obtained by the means for reading from the means and the means for photographing the basin at the reference plane position, is read from the storage means. Captured by the litter capture and recovery means trying to pass the reference plane position while floating the water surface captured in the image obtained by the imaging means. The computer functions as means for reading the partial photographing litter amount Lp, which is the amount of litter to be obtained, from the storage means, and means for calculating the total litter amount L passing through the water surface of the basin at the reference plane position and underwater by L = Lf × La / Lp I try to let them.

  Therefore, according to the litter flow amount measuring method, measuring apparatus, and measurement program for rivers according to claims 1 to 3, the water surface and the underwater litter amount in the basin at the reference surface position for counting the flow litter and the water surface litter amount Because the total amount of litter that passes through the basin at the reference plane position is calculated using the ratio, the measurement of the water surface and the amount of litter in the water is part of the basin at the reference plane position, but the The total amount of litter flow that flows through the whole (i.e., across the entire width of the river and including water) is measured.

  According to a fourth aspect of the present invention, there is provided a method for measuring litter flow in a river according to the first aspect, wherein a plurality of litter capture / recovery means are installed and litter is counted by each of the plurality of litter capture / recovery means. Measure the flow litter amount Lf for each means, divide the basin at the reference plane position according to the installation position of the plurality of litter capture and recovery means, and count the litter for each divided basin, thereby measuring the total photographing litter amount for each divided basin The total litter amount L is calculated for each basin divided by measuring La and the partial photographing litter amount Lp. In this case, even if the characteristics of the ratio between the flow retarder amount and the partial photographing litter amount differ depending on the basin portion of the reference plane position, the total litter amount reflecting the characteristics of each basin portion is calculated. .

  According to the litter flow amount measuring method, measuring apparatus, and measurement program of the river of the present invention, the measurement of the water surface and the amount of litter in the water is a part of the basin at the reference plane position, but the entire basin at the reference plane position (that is, The total amount of litter flowing through the entire width of the river and including the water) can be measured. It becomes possible. In addition, when the measurement period is long, particularly, it is possible to accurately measure the total litter flow amount while suppressing the labor and cost for measuring the litter flow amount.

  Further, according to the litter flow amount measuring method, measuring apparatus and measurement program in the river of the present invention, even if the characteristics of the ratio between the flow litter amount and the partial shooting litter amount differ depending on the basin portion of the reference plane position, Since the total litter amount reflecting the characteristics of each portion of the basin can be calculated, the litter flow amount in the entire basin at the reference plane position can be measured more accurately.

It is a flowchart explaining the litter flow amount measuring method in the river of embodiment. It is a functional block diagram of the litter flow amount measuring device when the litter flow amount measuring method in the river of the embodiment is implemented using a program. It is a figure which shows the measurement result of the flow retarder amount of Example 1, and the partial imaging | photography litter amount. (A) is a measurement result of the amount of flow litter in the central region of the measurement target river. (B) is a measurement result of the partial photographing litter amount in the central area of the river to be measured. (C) is a measurement result of the amount of flow litter in the right bank area of the measurement target river. (D) is a measurement result of the partial photographing litter amount in the right bank region of the measurement target river.

  Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings.

  1 and 2 show an example of an embodiment of a litter flow amount measuring method, measuring device, and measuring program in a river of the present invention. As shown in FIG. 1, the method for measuring the amount of litter flow in a river according to the present embodiment includes the litter and the water that are about to pass the reference surface position while floating on the water surface of the basin at the reference surface position for counting the flow litter in the river. A step of measuring a flow litter amount Lf by setting a means for capturing and collecting litter that passes through the reference surface position while being submerged in the basin of the reference surface position and counting the litter captured by the litter capturing and collecting means ( S1), and taking the basin of the reference plane position with the imaging means, and counting the litter passing through the reference plane position while floating the water surface imaged by the imaging means, thereby measuring the total imaging litter amount La While trying to pass the reference plane position while floating the water surface being photographed in the image obtained by the photographing means A step (S2) of measuring the amount Lp of the partial photographing by counting the litter captured by the trap capturing and collecting means, and the total litter passing through the water surface of the basin at the reference surface position and underwater by L = Lf × La / Lp And a step (S3) for calculating the amount L.

  The litter flow amount measuring method in the river is realized as a litter flow amount measuring apparatus in the river of the present invention. The litter flow amount measuring device according to the present embodiment is installed in a basin at a reference surface position for counting flow litter in a river, and passes through the reference surface position while floating on the water surface of the basin at the reference surface position. Obtained by means of reading a flow retarder Lf, which is the amount of litter captured by the means for capturing and recovering litter that attempts to pass through the reference plane position while immersed in the storage means, and means for photographing the basin of the reference plane position. The entire photographing litter amount La, which is the amount of litter that passes through the reference plane position while floating on the water surface photographed in the image, is read from the storage means, and the reference is obtained while floating the water surface photographed in the image obtained by the photographing means. Means for reading from the storage means a partial photographing litter amount Lp, which is the amount of litter captured by the litter capture and recovery means in an attempt to pass the surface position; = And means for calculating the total litter weight L passing through the water surface and water in the basin of the reference plane position by Lf × La / Lp.

  The above-described litter flow amount measuring device in a river can also be realized by executing the litter flow amount measuring program in a river of the present invention on a computer. In the present embodiment, a case where a litter flow amount measurement program in a river is executed on a computer will be described as an example.

  FIG. 2 shows an overall configuration of the litter flow amount measuring apparatus 10 of the present embodiment for executing the litter flow amount measurement program 17 in the river. The litter flow amount measuring device 10 includes a control unit 11, a storage unit 12, an input unit 13, a display unit 14, and a memory 15, and is connected to each other by a signal line such as a bus. A data server 16 is connected to the litter flow amount measuring apparatus 10 through a signal line such as a bus, and signals such as data and control commands are transmitted / received (ie, input / output) to / from each other via the signal line. .

  The control unit 11 performs calculation related to the control of the entire litter flow amount measuring apparatus 10 and the measurement of the litter flow amount by the litter flow amount measurement program 17 in the river stored in the storage unit 12, for example, a CPU (ie Central processing unit). The storage unit 12 is storage means capable of storing at least data and programs, and is, for example, a hard disk. The memory 15 serves as a memory space that is a work area when the control unit 11 executes various controls and calculations, and is, for example, a RAM (abbreviation of Random Access Memory).

  The input unit 13 is an interface for giving at least an operator's command to the control unit 11, and is, for example, a keyboard.

  The display unit 14 performs drawing / display of characters, graphics, and the like under the control of the control unit 11 and is, for example, a display.

  Then, by executing the litter flow amount measurement program 17 in the river, the control unit 11 of the litter flow amount measurement apparatus 10 is installed in the basin at the reference plane position where the flow litter in the river is counted, and the basin at the reference plane position. The memory means stores the flow litter amount Lf which is the amount of litter captured by the means for capturing and recovering the litter that passes through the reference surface position while floating on the water surface and the litter that passes through the reference surface position while immersed in water The amount of litter that is the amount of litter that passes through the reference plane position while floating on the water surface captured in the image obtained by the flow retarder amount reading section 11a as means for reading from and the means for photographing the basin at the reference plane position La is read from the storage means, and the reference plane position is floated on the water surface photographed in the image obtained by the photographing means. An imaging litter amount reading unit 11b serving as means for reading a partial imaging litter amount Lp, which is an amount of litter captured by the litter capturing / recovering means trying to pass from the storage means, and a basin of the reference plane position by L = Lf × La / Lp And a total litter amount calculation unit 11c as means for calculating a total litter amount L that passes through the water surface.

  In the present invention, a river in which the amount of litter flow is measured is called a measurement target river, and a river basin at a position where a reference plane in the river transverse direction for counting flow litter in the measurement target river is set. This is called the observation basin. For example, when measuring the amount of litter flowing out from a mangrove flooded area, the observation basin is set near the boundary of the mangrove flooded area on the measurement target river.

  In carrying out the present invention, a litter capture and recovery means is installed, and the amount of litter passing through the observation basin is measured while floating on the water surface and submerged in water (S1).

  Specifically, the litter capture and recovery means is, for example, a steel pipe or vinyl chloride coated steel pipe frame assembled in a rectangular parallelepiped lattice and a nylon net stretched on five sides of the rectangular parallelepiped. In addition, a flow litter trap that captures and collects litter flowing in water and passing through the observation basin is used.

  The litter capture / recovery means need not be installed over the entire width of the measurement target river, and may be any one having a partial width in the transverse direction of the measurement target river. Further, the litter capture and recovery means may extend over the entire depth from the water surface to the bottom of the river to be measured, or may reach at least the assumed litter submergence depth.

  The installation of the litter capture and recovery means and the measurement of the litter amount in the processing of S1 are performed over a period (hereinafter referred to as a measurement period) in which the measurement of the litter flow amount in the observation basin is required.

  Then, the litter capturing / recovering means is pulled up at predetermined time intervals, and the captured litter is counted. The raising of the litter capturing and collecting means and the counting of the litter may be performed at intervals of about 5 to 20 minutes, for example, or may be performed at intervals of about 30 minutes to 1 hour. Further, the measurement by the litter capture and recovery means may be performed continuously without interruption during the measurement period, for example, a time zone in which measurement is performed at the time interval (time step) and a time zone in which measurement is not performed. May be provided alternately.

  The measurement by the litter capture and recovery means passes through the width of the litter capture and recovery means in the crossing direction of the river in the observation basin (that is, the width of the river to be measured) while floating on the water surface of the observation basin and submerging in the water ( To be precise, the amount of litter (hereinafter referred to as the flow litter amount) to be passed is measured.

  Then, the flow retarder amount data obtained by the process of S1 is stored in the data server 16 as the flow retarder amount database 16a in association with the information of the measurement time (time zone). In the following, the database is referred to as DB.

  In carrying out the present invention, the observation basin is imaged by the imaging means, and the amount of litter passing through the observation basin while floating on the water surface is measured (S2).

  Specifically, for example, a video camera is used as the photographing means. The photographing means is installed so that the litter floating on the water surface can be photographed for the entire observation basin (that is, the entire width of the river to be measured).

  Then, the litter passing through the observation basin photographed in the image obtained by the photographing means is counted. In the present invention, out of the river crossing direction of the observation basin (that is, the width of the river to be measured), the litter passing through that portion is counted only for the width portion of the litter capturing and collecting means (S2-1), and the entire observation basin is counted. The litter that passes through the observation basin with respect to (that is, the entire width of the river to be measured) is counted (S2-2).

  Note that the litter photographed in the image obtained by the photographing means may be counted visually by the operator, or may be automatically counted using a software image processing technique. (For example, Fujio Tsutsumi and Satoshi Tachida: Automatic counting method using image processing of leaves flowing over rivers, Research Report R07002, 10pp., 2007). In addition, when automatically counting using image processing technology, it is possible to capture chlorophyll contained in the leaf, while ignoring dust floating on the water surface and more accurate counting. Therefore, it is desirable to use an infrared camera. When using an infrared camera, it is desirable to avoid a place where sunlight is strongly reflected on the water surface. For example, a place covered with leaves of a standing tree or under a bridge is preferably used as an observation basin.

  The amount of litter that passes while floating on the water surface only for the width of the litter capture and collection means in the crossing direction of the river in the observation basin by the measurement by the imaging means (hereinafter referred to as partial imaging litter amount) The amount of litter that passes while floating on the water surface as a whole (hereinafter referred to as the total photographing litter amount) is measured. Note that the partial photographing litter amount is actually the amount of litter captured by the litter capturing and collecting means in an attempt to pass through the observation basin while floating on the water surface. The overall shooting litter amount includes the partial shooting litter amount. Moreover, the litter that can be measured in the process of S2 can be recognized on the image obtained by the photographing means, and is not limited to that completely floating on the water surface of the river.

  Here, the imaging of the observation basin in the process of S2 is performed over the measurement period, and the measurement in the process of S2 is performed by dividing the measurement time (time zone) in correspondence with the time interval (time step) in the process of S1. . In addition, the measurement of the partial photographing litter amount is performed at least in the time zone in which the litter capturing / recovering means is installed and the litter is counted in the processing of S1. That is, there is always partial shooting litter amount data at a time (time zone) that matches the time (time zone) associated with the flow litter amount data recorded in the flow litter amount DB 16a.

  Then, the data of the partial shooting litter obtained by the process of S2-1 and the data of the total shooting litter obtained by the process of S2-2 are associated with the information of the measurement time (time zone), and the shooting litter amount is obtained. The data is stored in the data server 16 as the DB 16b.

  Then, the total amount of litter passing through the observation basin is calculated using the flow retarder data prepared in the process of S1 and the two shooting retarder data prepared in the process of S2 (S3).

  Specifically, the flow retarder amount reading unit 11a of the control unit 11 reads the value of the flow retarder amount for each time from the flow retarder amount DB 16a stored in the data server 16 as the storage unit, and stores the value in the memory 15. The shooting litter amount reading unit 11b of the control unit 11 reads the value of the partial shooting litter amount for each time and the value of the total shooting litter amount from the shooting litter amount DB 16b stored in the data server 16 as a storage unit. Is stored in the memory 15.

  Then, the total retard amount calculation unit 11 c of the control unit 11 reads from the memory 15 the value of the flow retard amount Lf for each time, the value of the partial shooting retard amount Lp, and the value of the total shooting retard amount La stored in the memory 15. At the same time, the total litter amount L for each time passing through the entire observation basin (in other words, the reference plane over the entire width of the river to be measured) is calculated by Equation 1. Formula 1 is defined in the litter flow amount measurement program 17 in the river.

    (Equation 1) L = Lf × La / Lp

  Note that the partial shooting litter amount and the flow retarder amount associated with the time (time zone) that matches the time (time zone) associated with the data of the total shooting litter amount recorded in the shooting litter amount DB 16b. If there is no such data, the partial shooting litter amount associated with the time (time zone) that overlaps or is closest to the time (time zone) associated with the data of the entire photographing litter amount and Calculation according to Formula 1 is performed using the data of the flow litter amount.

  Then, the total litter amount calculation unit 11c associates the calculated value of the total litter amount L for each time with the information of the measurement time (the time associated with the data of the total photographing litter amount), and the litter flow amount calculation result The data is stored in the data server 16 as the DB 16c.

  When the control unit 11 has processed all the data of the total shooting litter amount in the shooting litter amount DB 16b, the control unit 11 ends the processing for the shooting litter amount DB 16b (END).

  Here, in the above description, the number of litter capturing / recovering means and the number of photographing means are not particularly mentioned, but only one or a plurality of them may be installed.

  When a plurality of litter capture / recovery means are installed, the observation basin is divided in correspondence with the installation positions of the plurality of litter capture / recovery means, and the flow litter amount Lf is measured for each litter capture / recovery means (S1). ), The partial photographing litter amount Lp and the whole photographing litter amount La are measured for each divided observation basin (S2), and the total litter amount L is calculated for each basin using these divided observation basin values (S3). ). Then, the sum of the total litter amounts for each basin is set as the litter flow amount that passes through the entire final observation basin. In this case, when the ratio between the flow litter amount and the partially photographed litter amount differs greatly depending on the portion of the observation basin, the litter flow amount in the entire observation basin can be measured more accurately.

  As for the photographing means, the entire observation basin may be photographed using one photographing means, or a plurality of photographing means may be photographed.

  According to the litter flow amount measuring method, measuring apparatus, and measurement program in the river of the present invention having the above-described configuration, the measurement period includes the litter submerged in water by counting only the litter floating on the water surface. Since the amount of litter flow can be measured, the amount of litter flow for all the litter flowing in the water surface and under the water by the flow of river water is counted for the measurement period, even though it is only counting litter floating on the water surface. It becomes possible to measure.

  In addition, although the above-mentioned form is an example of the suitable form of this invention, it is not limited to this, A various deformation | transformation implementation is possible in the range which does not deviate from the summary of this invention. For example, in the above-described embodiment, the various DBs 16a to 16c are stored in the data server 16. However, the present invention is not limited to this, and the DBs 16a to 16c may be stored in the storage unit 12 as a storage unit.

  Regarding the method for measuring the amount of litter flow in the river of the present invention, in the actual river, measurement of the amount of flow litter by the litter capture and collection means and measurement of the amount of litter by the photographing means and the validity of the measurement method based on these measurement results The studied embodiment will be described with reference to FIG.

  In this example, it is assumed that the amount of litter flowing out from the mangrove area in the Fukitsu River estuary, Ishigaki Island, Okinawa Prefecture is assumed, and the boundary part of the mangrove area above the Fukitsu River is set as the measurement target river. Is the observation basin.

  In this embodiment, a litter trap consisting of a 45 × 45 × 150 cm steel pipe or vinyl chloride coated steel pipe frame and a 3 cm mesh nylon net is used as litter capturing and collecting means twice a day for 3-5 days. The amount of flow litter was measured by counting the number of litters that passed through the observation basin and flowed out of the mangrove area at low tide (S1).

  In this embodiment, 3-5 digital video cameras are installed on the bridge girder on the estuary so that the entire observation basin (that is, the entire width of the Fukitsu River) can be photographed. The amount of photographic litter was measured by counting the litter flowing out (S2).

  In this embodiment, a plurality of flow litter traps are installed, and various measurements are performed separately for the central area and the right bank area of the river.

  As a result of measuring the amount of flow litter by time, the results shown in FIG. 3 (A) for the central area of the river and (C) for the right bank area of the river were obtained. Moreover, as a result of measuring the partial photographing litter amount according to time, the results shown in FIG. 3B for the river central area and the same result (D) for the right bank area of the river were obtained.

  From the comparison between (A) and (B) in FIG. 3 and the comparison between (C) and (D), the amount of flow litter obtained by counting both the litter floating on the water surface and the litter submerged in water. It has been confirmed that there is a proportional relationship between the amount of litter that is obtained by counting the litter floating on the water surface. From this, it was confirmed that the amount of litter flow can be accurately measured for all the litters flowing by the flow of water in the river according to the present invention in which the total amount of litter is calculated by Equation 1.

  From the comparison of the results for the central river area (Figs. 3 (A) and 3 (B)) and the results for the right bank of the river (the same (C) and (D)), It was confirmed that the ratio with the amount of shooting litter may be different. Therefore, by installing multiple litter capture and recovery means, dividing the observation basin, performing various measurements for each of the divided observation basins, and calculating the total litter amount, the litter flow rate in the entire observation basin can be further increased. It was confirmed that it can be measured accurately.

DESCRIPTION OF SYMBOLS 10 Litter flow quantity measuring device 11 Control part 12 Storage part 13 Input part 14 Display part 15 Memory 16 Data server 17 Litter flow quantity measurement program

Claims (4)

  Means for capturing and recovering a litter that attempts to pass through the reference surface position while floating on the water surface of the basin at the reference surface position for counting flow litter in a river and a litter that attempts to pass through the reference surface position while submerged in water The step of measuring the flow litter amount Lf by counting the litter captured by the litter capturing and collecting means while being installed in the basin at the reference plane position, and photographing the basin at the reference plane position by the photographing means and the photographing means The total photographing litter amount La is measured by counting the litter passing through the reference surface position while floating on the water surface photographed in the image obtained by the above and the water surface photographed in the image obtained by the photographing means Counting litter captured by the litter capture and recovery means while trying to pass the reference plane position while floating A step of measuring the partial photographing litter amount Lp by calculating a total litter amount L passing through the water surface of the basin at the reference surface position and underwater by L = Lf × La / Lp. Method for measuring litter flow in rivers.   It is installed in the basin of the reference plane position that counts the flow litter in the river, passes through the reference plane position while submerging in the water and litter that passes through the reference plane position while floating on the water surface of the basin of the reference plane position The water surface captured in the image obtained by the means for reading the flow litter amount Lf, which is the amount of the litter captured by the means for capturing and collecting the litter to be obtained, from the storage means and the means for photographing the basin at the reference plane position. Read the entire photographing litter amount La, which is the amount of litter that passes through the reference surface position while floating, from the storage means, and pass through the reference surface position while floating on the water surface imaged in the image obtained by the photographing means. Means for reading a partial photographing litter amount Lp, which is the amount of litter captured by the litter capture and recovery means, from the storage means, and L = Lf × Litter flow amount measuring apparatus in rivers and having a means for calculating the total litter weight L passing through the water surface and water in the basin of the reference surface position by a / Lp.   When measuring the amount of litter flow in a river, the litter is installed in the basin of the reference plane position where the flow litter in the river is counted and tries to pass through the reference plane position while floating on the water surface of the basin of the reference plane position And means for reading from the storage means a flow litter amount Lf, which is the amount of litter captured by the means for capturing and recovering the litter that attempts to pass through the reference surface position while submerged in water, and means for photographing the basin at the reference surface position The entire surface of the litter La, which is the amount of litter that passes through the reference surface position while floating on the surface of the water photographed in the image obtained by the above, is read from the storage means and the water surface photographed in the image obtained by the photographing means A partial photographing litter amount that is the amount of litter that is captured by the litter capturing and collecting means while trying to pass the reference plane position while floating Measurement of litter flow in a river for causing the computer to function as means for calculating p from the storage means, and calculating the total litter amount L passing through the water surface and the water surface of the basin at the reference plane position by L = Lf × La / Lp program.   By installing a plurality of the litter capture and recovery means and counting the litter for each of the plurality of litter capture and recovery means, the flow litter amount Lf is measured for each of the litter capture and recovery means and corresponds to the installation positions of the plurality of litter capture and recovery means Then, by dividing the basin at the reference plane position and counting the litter for each divided basin, the whole photographing litter amount La and the partial photographing litter amount Lp are measured for each divided basin, and each divided basin is measured. The method according to claim 1, wherein the total litter amount L is calculated.

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