CN112802069B - Determination method for water-blocking dike cofferdam of shallow lake - Google Patents
Determination method for water-blocking dike cofferdam of shallow lake Download PDFInfo
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- CN112802069B CN112802069B CN202011628969.5A CN202011628969A CN112802069B CN 112802069 B CN112802069 B CN 112802069B CN 202011628969 A CN202011628969 A CN 202011628969A CN 112802069 B CN112802069 B CN 112802069B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/30—Determination of transform parameters for the alignment of images, i.e. image registration
- G06T7/33—Determination of transform parameters for the alignment of images, i.e. image registration using feature-based methods
- G06T7/337—Determination of transform parameters for the alignment of images, i.e. image registration using feature-based methods involving reference images or patches
Abstract
The invention discloses a method for judging a water-blocking dike cofferdam of a shallow lake, which is applied to the technical field of shallow lake treatment. The method comprises the following specific steps: superposing a shallow lake streamline distribution map and a dike cofferdam distribution map to determine a judging area; calculating three indexes of streamline distribution density, uniformity and average serpentine degree in the judging area to obtain the numerical value of each index; comparing the index values with the reference state index values, and finally judging to obtain the water-blocking dike cofferdam of the shallow lake. The invention provides a method for judging the water-blocking dike cofferdam of a shallow lake, which can scientifically judge the water-blocking dike cofferdam to be removed in the shallow lake so as to recover the water power of the lake and improve the water quality of the lake.
Description
Technical Field
The invention relates to the technical field of shallow lake treatment, in particular to a method for judging the water-blocking dike cofferdam of a shallow lake.
Background
In order to develop aquaculture industry, a large amount of artificial construction of a dike is used for enclosing a river in shallow lakes, which prevents the transportation of the lakes, restricts the improvement of hydrodynamic conditions, is unfavorable for water quality improvement, restricts the self-restoration of the ecological system of the lakes, and needs to clear the dike in the shallow lakes and river channels. However, under the condition that the water-blocking dike is in a plurality of dikes and the economic investment is limited, the water-blocking dike is required to be determined and removed so as to improve the water power of the lake, improve the water quality of the lake and judge the water-blocking dike in the shallow lake, so that the water-blocking dike is an important problem.
Therefore, it is a urgent need for those skilled in the art to provide a method for determining the water-blocking dike dam.
Disclosure of Invention
In view of the above, the present invention provides a method for determining the water-blocking dike dam of shallow lakes, which can determine the water-blocking dike dam to be removed and improve the hydrodynamic force of lakes.
In order to achieve the above object, the present invention provides the following technical solutions:
a method for judging the water-blocking embankment cofferdam of a shallow lake specifically comprises the following steps:
superposing a shallow lake streamline distribution map and a dike cofferdam distribution map to determine a calculation area;
calculating three indexes of streamline distribution density, uniformity and average serpentine degree in the region to obtain values of all indexes;
and comparing the index values with the index values in the reference state to obtain the final determined water-blocking dike cofferdam of the shallow lake.
Preferably, in the above method for determining a water-blocking dam enclosing of a shallow lake, a flow line graph and a water-blocking dam distribution graph are superimposed, an image is used as a reference image, a transformation relationship between the image to be registered and the reference image is determined, the image to be registered is transformed into the same coordinate plane as the reference image, and the pixels of the two images are aligned; image I to be registered 1 Reference image I 2 The coordinates of the two are respectively (x, y) and (x ', y'), and the mapping relation between the two is as follows: i 2 (x′,y′)＝I 1 (f x (x,y),f y (x,y))。
Further, the registration method based on the image features comprises the following steps:
firstly, extracting features, namely extracting image features common to two images respectively, wherein the features are features which are consistent in transformation such as comparison example, rotation, translation and the like in the two images, such as line crossing points, object edges, corner points, virtual circles, centers of closed areas and the like. Mainly adopts the characteristic of extraction points. After feature matching, registration is performed using numerical analysis (also known as polynomial transformation), which registers points (x) 1 ,y 1 ) Mapped to a point (x) 2 ,y 2 ) Expressed mathematically as
Wherein s is a scale factor, θ is a rotation angle, t x For the translation in the x direction, t y Is the amount of translation in the y-direction.
Preferably, in the above method for determining a water-blocking dam in a shallow lake, the formula for calculating the distribution density, uniformity and average degree of meandering of the regional streamline is as follows:
wherein the density formula of regional streamline distribution:
ρ＝n/s；
wherein ρ is the distribution density of regional streamline, and n is the number of regional streamline lines; s is the area of the area, and the unit is km 2 The method comprises the steps of carrying out a first treatment on the surface of the A uniformity formula of regional streamline distribution:
wherein E is uniformity, m is the number of inter-line intervals in the region; d, d i Representing the distance between the ith streamline and the (i+1) th streamline in the area, wherein the unit is km; d is the average value of the intervals among all the streamline units km; the average degree of meandering of the regional streamline formula:
wherein W is the average degree of the serpentine of the streamline, n is the number of the lines in the region, L i For the actual length of the ith streamline, D i Is the linear distance between two points along the water flow direction of the ith streamline in the area.
Compared with the prior art, the invention provides the method for judging the water-blocking dike cofferdam of the shallow lake, which can determine that the water-blocking dike cofferdam to be removed is required to be removed, so that the water power of the lake is improved, and the water quality of the lake is further improved. The invention determines the calculation area by superposing the flow line diagram and the dam enclosing distribution diagram, then calculates the distribution density, uniformity and average serpentine degree of the flow lines in the area, compares the index values with the index values in the reference state, and judges the water-blocking dam enclosing, thereby providing a basis for dismantling the dam enclosing.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic diagram of ArcGIS registration according to the present invention;
FIGS. 3 (a) -3 (b) are schematic diagrams showing the distribution of the dam bank according to the present invention;
FIG. 4 is a schematic diagram showing the superposition of the flow pattern and the dam bank profile of the present invention;
FIG. 5 is a diagram of a decision flow chart of the present invention;
FIG. 6 is a diagram showing the result of the judgment according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A method for judging the water-blocking embankment cofferdam of a shallow lake is shown in figure 1, and comprises the following specific steps:
superposing a shallow lake streamline distribution map and a dike cofferdam distribution map to determine a calculation area;
calculating three indexes of streamline distribution density, uniformity and average serpentine degree in the region to obtain values of all indexes;
and comparing the index values with the index values in the reference state to obtain the final determined water-blocking dike cofferdam of the shallow lake.
Further, the shallow lake streamline distribution diagram can be obtained through software simulation or in-field investigation.
In order to further optimize the technical scheme, a lake flow line graph and a dyke distribution map are overlapped, an image is used as a reference image, a transformation relation between an image to be registered and the reference image is determined, the image to be registered is transformed into the same coordinate plane as the reference image, and the pixels of the two images are aligned; image I to be registered 1 Reference image I 2 The coordinates of the two are respectively (x, y) and (x ', y'), and the mapping relation between the two is as follows: i 2 (x′,y′)＝I 1 (f x (x,y),f y (x,y))。
Further, as shown in fig. 2, the image feature-based registration method:
firstly, extracting features, namely extracting image features common to two images respectively, wherein the features are features which are consistent in transformation such as comparison example, rotation, translation and the like in the two images, such as line crossing points, object edges, corner points, virtual circles, centers of closed areas and the like. Mainly adopts the characteristic of extraction points. After feature matching, registration is performed using numerical analysis (also known as polynomial transformation), which registers points (x) 1 ,y 1 ) Mapped to a point (x) 2 ,y 2 ) Expressed mathematically as
Wherein s is a scale factor, θ is a rotation angle, t x For the amount of translation in the x-direction,t y is the amount of translation in the y-direction.
And (3) superposing a lake flow diagram and a dike cofferdam distribution diagram by using a GIS platform as shown in fig. 3 (a) -3 (b), wherein the superposition result is shown in fig. 4, and determining the area needing to be calculated according to the actual distribution condition of the dike cofferdam.
Preferably, in the above method for determining a water-blocking dam in a shallow lake, the formula for calculating the distribution density, uniformity and average degree of meandering of the regional streamline is as follows:
wherein the density formula of regional streamline distribution:
ρ＝n/s；
wherein ρ is the distribution density of regional streamline, and n is the number of regional streamline lines; s is the area of the area, and the unit is km 2 The method comprises the steps of carrying out a first treatment on the surface of the A uniformity formula of regional streamline distribution:
wherein E is uniformity, m is the number of inter-line intervals in the region; d, d i Representing the distance between the ith streamline and the (i+1) th streamline in the area, wherein the unit is km; d is the average value of the intervals among all the streamline units km; the average degree of meandering of the regional streamline formula:
wherein W is the average degree of the serpentine of the streamline, n is the number of the lines in the region, L i For the actual length of the ith streamline, D i Is the linear distance between two points along the water flow direction of the ith streamline in the area.
The judging flow is shown in fig. 5, and the water-blocking dike cofferdam is determined by comparing the results of three indexes of the distribution density of the regional streamline, the distribution uniformity of the regional streamline and the average winding degree of the regional streamline, which are obtained by calculation, with all index values in a reference state; in the embodiment, each index value of the reference state is determined according to the historical data, and if the streamline distribution density of the comparison area is greater than the reference state value, the streamline distribution uniformity of the comparison area is compared; if the water blocking dam is smaller than the reference state value, determining that the water blocking dam is a low bank; when the distribution uniformity of the regional streamline is calculated to be larger than the reference state value, further comparing the average sinuous degree; if the water blocking dam is smaller than the reference state value, determining that the water blocking dam is a low bank; the average serpentine is compared and if it is greater than the reference condition value, the dam is water-blocking, otherwise the dam is not water-blocking.
The reference state value may be determined according to a history record, or may be obtained by constructing a model according to history data and pushing the model.
Determination result:
in summary, villages, cultivated lands, reed fields and other areas without the dike cofferdam are eliminated, and finally nine water-blocking dike cofferdams in the lake area are obtained: the overall distribution of Pu Tai villages including northwest, he Zhuangzi village south, western street village northwest, western street village west, western street village east, northern village, near Fu Henan Liu Zhuang, near Baigou river inlet and near yellow lake inlet is shown in figure 6.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (1)
1. A method for judging a water-blocking embankment cofferdam of a shallow lake is characterized by comprising the following specific steps: superposing a shallow lake streamline distribution map and a dike cofferdam distribution map to determine a calculation area;
calculating three indexes of streamline distribution density, uniformity and average serpentine degree in the region to obtain values of all indexes;
comparing the index values with the index values in the reference state to obtain the final determined water-blocking dike cofferdam of the shallow lake;
calculating a calculation formula of regional streamline distribution density, uniformity and average serpentine degree:
wherein the density formula of regional streamline distribution:
ρ＝n/s；
wherein ρ is the distribution density of regional streamline, and n is the number of regional streamline lines; s is the area of the area, and the unit is km 2 ；
A uniformity formula of regional streamline distribution:
wherein E is uniformity, m is the number of inter-line intervals in the region; d, d i Representing the distance between the ith streamline and the (i+1) th streamline in the area, wherein the unit is km; d is the average value of the intervals among all the streamline units km;
the average degree of meandering of the regional streamline formula:
wherein W is the average degree of the serpentine of the streamline, n is the number of the lines in the region, L i For the actual length of the ith streamline, D i Is the linear distance between two points along the water flow direction of the ith streamline in the area.
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