CN116625325B - Working method of three-dimensional natural potential monitoring device for seepage in seabed - Google Patents
Working method of three-dimensional natural potential monitoring device for seepage in seabed Download PDFInfo
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Abstract
The application provides a working method of a three-dimensional natural potential monitoring device for seepage in a seabed, which comprises an anti-sedimentation plate, wherein a battery, a baffle plate, a collecting unit, a transmission unit and balancing weights are fixedly arranged on the upper surface of the anti-sedimentation plate; the lower surface of the anti-sedimentation plate is fixedly provided with a natural potential probe rod group. By the technical scheme, three-dimensional monitoring can be realized, and the effect of long-term monitoring can be achieved; the device and the method can be used for determining the seepage path, the flow direction and the flow velocity under two states.
Description
Technical Field
The application relates to the technical field of seabed seepage monitoring, in particular to a working method of a three-dimensional natural potential monitoring device for seabed internal seepage.
Background
Ocean is a human resource treasury, contains a large amount of natural gas hydrate, oil gas resources and the like, releases the natural gas hydrate and the oil gas resources very easily to induce the seepage process of gas-liquid fluid in the seabed, monitors the occurrence and development of seabed seepage, and has important significance for searching for a seabed resource occurrence area. Seepage also damages the soil structure of the seabed, changes the internal stress field of the seabed, reduces the soil strength, causes the instability of the seabed, and has an important influence on the safety of ocean engineering facilities. In addition, seabed seepage can redistribute seabed sediments to form special seabed shapes such as mud volcanic, pit, dome and the like, and has important influence on the formation and evolution of seabed landforms. In conclusion, the method has important significance for monitoring the seepage of the seabed.
At present, the means for researching seabed seepage is mainly acoustic, pore pressure and resistivity methods, but the monitoring methods have a few defects. Although the acoustic method can monitor in a large range, the space-time resolution is lower, the monitoring effect is poor, and quantitative evaluation of seepage characteristic parameters such as flow velocity is difficult. Although the pore pressure method has higher space-time resolution, the pore pressure method is limited by the volume and the working principle of a sensor, and the seepage parameter is difficult to effectively determine in actual observation. The resistivity method is used as a mature technology, can be constructed through a seabed high-precision electric field, monitors and inverts a plurality of parameters, but electrodes are easily polarized for a long time, and long-term monitoring of the seabed environment is difficult to realize. Thus, there is a lack of an efficient, reliable and economical method for determining the path, direction and flow rate of seabed seepage.
The natural potential method has wide development space in the aspect of ocean monitoring, is applied to the determination of seabed interfaces, the measurement of suspended sediment concentration, the searching of mineral deposits and the like, but fresh students research the characteristic parameters of seepage inside the seabed according to the principle that the natural electric field changes caused by fluid flow.
Disclosure of Invention
In order to make up the defects of the prior art, the application provides a working method of a three-dimensional natural potential monitoring device for seepage in the seabed.
The application is realized by the following technical scheme: the working method of the three-dimensional natural potential monitoring device for seepage in the seabed comprises a sedimentation-preventing plate, wherein a battery, a partition plate, an acquisition unit, a transmission unit and balancing weights are fixedly arranged on the upper surface of the sedimentation-preventing plate, the partition plate comprises a first partition plate and a second partition plate, the first partition plate and the second partition plate are respectively and fixedly arranged on the left part and the right part of the upper surface of the sedimentation-preventing plate, the battery is positioned on the outer side of the first partition plate, the acquisition unit and the transmission unit are positioned on the outer side of the second partition plate, a plurality of balancing weights are arranged between the inner sides of the first partition plate and the second partition plate, and rope holes are formed in the middle parts of the balancing weights and the sedimentation-preventing plate;
the lower surface of the anti-sedimentation plate is fixedly provided with a natural potential probe rod group, the natural potential probe rod group comprises a plurality of natural potential probe rods which are vertically and downwards arranged, the bottom end of each natural potential probe rod is a conical tip, the outer wall of each natural potential probe rod is provided with a plurality of longitudinally distributed electrode rings, an insulating block is arranged between each electrode ring, and a signal wire led out from the top end of each natural potential probe rod is connected with a battery, an acquisition unit and a transmission unit;
the method specifically comprises the following steps:
s1, placing all electrode rings in a seawater environment, taking a ground potential as a zero potential for collected natural potential signals, and then calibrating each electrode ring according to a collection result;
s2, obtaining the coupling coefficient of seepage flow velocity and potential difference through indoor testkKnowing the relation of seepage flow velocity and potential difference as a linear function, and recording the electrode ring spacing for measuring the potential difference asL；
S3, arranging a monitoring device in the sea area to be observed, reflecting the penetration depth in real time through data, and removing and recovering the balancing weight when the probe rod is completely penetrated into the seabed;
set penetration depth ashThe length of the cone tip ise 1 The electrode ring with obvious difference is the first one from the cone tipe 2 And if so, the penetration depth is as follows:
h=e 1+ e 2 L（1）
s4, each electrode ring transmits the measured data to the acquisition unit, the transmission unit transmits the data to the ground base station, and through analysis and processing of the data, whether seepage occurs in the seabed or not and the seepage path, the flow direction and the flow speed can be judged, and the seepage is divided into initial seepage and stable seepage according to the state;
s5, judging the initial seepage and the stable seepage in the step S4, wherein the method specifically comprises the following steps of:
s5-1, connecting the cone points of the two probe rods closest to the probe rods by taking the cone point of the natural potential probe rod farthest from the transmission unit as an origin, wherein the cone points are connected into lines, namely X, Y shafts, and meanwhile, the probe rod at the origin is a Z shaft; because the natural potential value of the electrode ring on the seepage path is lower than that of the electrode ring which does not generate or is far away from seepage, the electrode ring is called an abnormal electrode ring, and meanwhile, the abnormal electrode ring is named as，/>…/>，/>The data acquired over the time sequence are +.>，/>…，/>The data acquired over the time sequence are +.>，/>…/>And so on to->The data acquired over the time sequence are +.>，/>…/>The method comprises the steps of carrying out a first treatment on the surface of the The coordinates of two abnormal electrode rings in the coordinate system are respectively ()>) And (/ ->) Is provided with->Other abnormal electrode rings and the like;
s5-2, when the seepage starts, the natural potential of the seepage front reaches the point, and the natural potential is obviously reduced; when the seepage reaches stability, the natural potential value at the seepage path is lower than the natural potential at the non-seepage place, so that the natural potential signal is determined to be obviously lower in all the electrode rings or is always lower than the electrode rings of other electrode ring data, namely，/>…/>；
S5-3, fitting the electrode ring into a straight line, wherein the straight line is a seepage path, determining a straight line expression of a space according to abnormal electrode ring coordinate points, and representing the seepage path by the straight line expression:
| （2） |
s5-4, determining seepage flow direction in initial and stable states, and specifically comprising the following steps of:
s5-4-1, when initial seepage occurs, the natural potential reduction direction of the electrode ring is the seepage direction, and the seepage direction can be represented by vectors according to the positions of two abnormal electrode rings in a space coordinate system in quadrants, namely:
| （3） |
s5-4-2, after the seepage channel is completely formed, namely after the seepage is stabilized, passing through any timeAnd when the electrode ring data is used for judging the seepage flow direction, the seepage flow direction can be represented by vectors according to the position of an abnormal electrode ring in a space coordinate system in a quadrant, namely:
the direction is:
| （4） |
s5-5, determining seepage flow velocity in initial and stable states, and specifically comprising the following steps of:
s5-5-1, calculating the initial seepage flow speed as follows:
slope of each abnormal electrode ring at different timeThe calculation method comprises the following steps:
| （5） |
in the method, in the process of the application,nis the number of the abnormal electrode ring,tis a certain moment;
the time corresponding to the minimum slope of the natural potential of each abnormal electrode ring is respectively set as，/>：
（6）；
Calculating the distance between two adjacent abnormal electrode rings in the space：
（7）
Calculating an initial flow rate：
（8）；
S5-5-2, calculating stable seepage flow velocity as follows:
calculating the average potential of each abnormal electrode ring：
（9）；
Calculating the potential difference delta between adjacent abnormal electrode rings：
Δ-/>（10）；
Adjacent two abnormal electrodes in the calculation space as in (6)Ring distance：
Calculating a steady flow rate：
| =k∙ | （11）。 |
Preferably, the anti-sedimentation plate (7) and the partition plate (3) are made of POM material.
Preferably, the cone tip (404) is 316 stainless steel.
Preferably, the insulating block (402) is made of POM material.
Preferably, the electrode ring (403) is made of a titanium alloy material.
The application adopts the technical proposal, and compared with the prior art, the application has the following beneficial effects:
(1) The device can realize three-dimensional monitoring, solves the problem that the current probe rod is difficult to realize three-dimensional monitoring, saves energy by a passive source method, and can achieve the effect of long-term monitoring;
(2) The device and the method can effectively utilize the device and the method to determine the seepage path, the flow direction and the flow velocity under two states, and can effectively study the occurrence and the stabilization process of seepage, so that the study on seepage is finer.
Additional aspects and advantages of the application will be set forth in part in the description which follows, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of the structure of the device of the present application;
FIG. 2 is a schematic view of the layout process of the device of the present application;
FIG. 3 is a coordinate system and seepage pattern diagram;
FIG. 4 is a graph of the results of an indoor experiment;
figure 5 is a flowchart of the operation of the process,
the correspondence between the reference numerals and the components in fig. 1 is:
1 battery, 2 balancing weights, 3 partition boards, 301 first partition boards, 302 second partition boards, 4 natural potential probe rods, 401 signal lines, 402 insulating blocks, 403 electrode rings, 404 cone tips and 5: rope hole, 6: acquisition unit, 7 anti-sedimentation plate, 8 transmission unit
Detailed Description
In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced otherwise than as described herein, and therefore the scope of the present application is not limited to the specific embodiments disclosed below.
The following describes in detail the operation method of the three-dimensional natural potential monitoring device for seepage in the seabed according to the embodiment of the present application with reference to fig. 1 to 5.
As shown in fig. 1, the application provides a working method of a three-dimensional natural potential monitoring device for seepage in a seabed, and as shown in fig. 1, the three-dimensional natural potential monitoring device comprises an anti-sedimentation plate 7, a battery 1, a partition plate 3, an acquisition unit 6, a transmission unit 8 and a balancing weight 2 are fixedly arranged on the upper surface of the anti-sedimentation plate 7, the partition plate 3 comprises a first partition plate 301 and a second partition plate 302, the first partition plate 301 and the second partition plate 302 are respectively and fixedly arranged on the left part and the right part of the upper surface of the anti-sedimentation plate 7, the battery 1 is positioned on the outer side of the first partition plate 301, the acquisition unit 6 and the transmission unit 8 are positioned on the outer side of the second partition plate 302, and natural potential signal acquisition, storage and wireless transmission can be realized. A plurality of balancing weights 2 are placed between the inner sides of the first partition plate 301 and the second partition plate 302, the number of the balancing weights 2 is determined according to the condition of the substrate and the penetration depth, and rope holes 5 are formed in the middle parts of the balancing weights 2 and the anti-sedimentation plates 7, so that the balancing weights and the devices can be conveniently recovered through ropes; the anti-sedimentation plate 7 and the partition plate 3 are made of POM materials, are firm in material, corrosion-resistant and light in weight, can effectively reduce the possibility of sedimentation of equipment caused by dead weight, and can adapt to the submarine strong corrosion environment.
The lower surface of the anti-sedimentation plate 7 is fixedly provided with a natural potential probe rod group, and the natural potential probe rod group comprises a plurality of natural potential probe rods 4 which are vertically downwards arranged, so that three-dimensional natural potential signal acquisition is realized. The specific constitution of the natural potential probe rods 4 is shown in the left side of fig. 1, the bottom end of each natural potential probe rod 4 is a conical tip 404, a plurality of longitudinally distributed electrode rings 403 are arranged on the outer wall of each natural potential probe rod 4, an insulating block 402 is arranged between each electrode ring 403, and a signal wire 401 led out from the top end of the natural potential probe rod 4 is connected with a battery 1, an acquisition unit 6 and a transmission unit 8; the cone tip 404 is made of 316 stainless steel, and has higher strength and is beneficial to penetration. The insulating block 402 is made of POM material, is firm and insulated, the electrode ring 403 is made of titanium alloy material, and the signal wire is a signal shielding wire, so that interference of electromagnetic field formed in the electric signal transmission process on signals can be prevented. In addition, the natural potential probe rod spacing and the electrode ring number spacing can be properly adjusted according to the monitoring requirements.
As shown in fig. 5, the method specifically comprises the following steps:
s1, placing all electrode rings (403) in a seawater environment, taking a ground potential as a zero potential for collected natural potential signals, and then calibrating each electrode ring (403) according to a collection result;
s2, obtaining the coupling coefficient of seepage flow velocity and potential difference through indoor testkKnowing the relation of the seepage flow velocity and the potential difference as a linear function, and recording and measuring the distance between the adjacent electrode rings (403) asL；
S3, arranging a monitoring device in the sea area to be observed, reflecting the penetration depth in real time through data, and removing and recovering the balancing weights when the probe rod is completely penetrated into the seabed, wherein the specific process is shown in figure 2;
the nature of sea water is different from that of sea bed, so that the natural potential value has obvious difference at the interface between sea bed and sea water, so that the penetration depth can be determined. Set penetration depth ashThe length of the cone tip ise 1 The electrode ring with obvious difference is the first one from the cone tipe 2 And if so, the penetration depth is as follows:
h=e 1+ e 2 L（1）
s4, each electrode ring (403) transmits measured data to the acquisition unit (6), meanwhile, the transmission unit (8) transmits the data to the ground base station, and through analysis and processing of the data, whether seepage occurs in the seabed or not can be judged, and a seepage path, a seepage direction and a seepage velocity can be judged;
s5, judging the initial seepage and the stable seepage in the step S4, wherein the method specifically comprises the following steps of:
s5-1, assuming that seepage is shown in figure 3, and establishing a space rectangular coordinate system according to figure 3, namely taking the cone tip of a natural potential probe rod farthest from a transmission unit as an origin, and then taking the cone tips of two probe rods closest to the probe rod as points to be connected into lines, wherein the points are respectivelyX、YShaft with probe rod at originZA shaft; since the natural potential value of the electrode ring on the seepage path is lower than that of the electrode ring which does not generate seepage or is far away from seepage, the electrode ring is called as the partThe electrode rings are abnormal electrode rings, as shown in the right side of FIG. 3, for convenience of description, 5 abnormal electrode rings are assumed, and the serial numbers of the 5 abnormal electrode rings areTo->The method comprises the steps of carrying out a first treatment on the surface of the Meanwhile, the abnormal electrode ring is named +.>，/>…/>，/>The data acquired over the time sequence are +.>，/>…/>，/>The data acquired over the time sequence are +.>，/>…/>And so on to->The data collected over time sequence are respectively，/>…/>The method comprises the steps of carrying out a first treatment on the surface of the For convenience of description below, it is assumed that the coordinates of two abnormal electrode rings in the coordinate system set in the lower diagram are (++>) And (/ ->) For convenience of indicating direction, let ∈>Other abnormal electrode rings and the like;
s5-2, when the seepage starts, the natural potential of the seepage front reaches the point, and the natural potential is obviously reduced; when the seepage reaches the stability, the natural potential value at the seepage path is lower than the potential at the non-seepage place, so that the natural potential signal is determined to be significantly lower in all the electrode rings or is always lower than the electrode rings of other electrode ring data, namely the electrode rings shown in figure 3，/>…/>；
S5-3, fitting the electrode ring into a straight line, wherein the straight line is a seepage path, determining a straight line expression of a space according to abnormal electrode ring coordinate points, and representing the seepage path by the straight line expression:
| （2） |
s5-4, determining seepage flow direction in initial and stable states, and specifically comprising the following steps of:
s5-4-1, when initial seepage occurs, the natural potential reduction direction of the electrode ring is the seepage direction, and the seepage direction can be represented by vectors according to the positions of two abnormal electrode rings in a space coordinate system in the quadrant shown in FIG. 3, namely:
the direction is
| （3） |
S5-4-2, after the seepage channel is completely formed, i.e. after seepage is stabilized, more positive ions are often accumulated at the front end of seepage, so that the natural potential of an electrode ring at the front end of seepage is often greater than that of an electrode ring at the rear end of seepage, and the natural potential of the electrode ring at the front end of seepage passes through any momentWhen the electrode ring data is used for judging the seepage flow direction, the seepage direction can be expressed by vectors according to the position of an abnormal electrode ring in a space coordinate system in the quadrant shown in fig. 3, namely:
the direction is
| （4） |
S5-5, due to the effect of seepage on the double-electron layer, the natural potential change generated by the seepage in the initial state and the stable state is also different, and the seepage flow velocity in the initial state and the stable state is determined, specifically comprising the following steps:
s5-5-1, when initial seepage occurs, natural potential tends to drop rapidly at the position where the seepage front arrives, as shown in fig. 4, the position with the smallest slope in fig. 4 is the moment when the natural potential drops fastest, namely the moment when the seepage front just arrives at the electrode ring, therefore, the distance that the seepage front passes in a certain time can be determined by calculating and determining the moment when the natural potential of the abnormal electrode ring drops fastest and the distance between the abnormal electrode rings, and accordingly, the initial seepage flow velocity is calculated as follows:
slope of each abnormal electrode ring at different timeThe calculation method comprises the following steps:
| （5） |
wherein n isIs the number of the abnormal electrode ring,tis a certain moment;
the time corresponding to the minimum slope of each abnormal electrode ring is respectively set as，/>：
（6）；
Calculating the distance between two adjacent abnormal electrode rings in the space：
（7）
Calculating an initial flow rate：
（8）；
S5-5-2, when seepage reaches stability, the seepage at different flow rates can also have different effects on the double-electronic-layer structure, and the method is characterized in that when the flow rates are different, the potential difference value at the same interval is different, the larger the flow rate is, the larger the potential difference is, and the stable seepage flow rate is calculated as follows:
calculating the average potential of each abnormal electrode ring：
（9）；
Calculating the potential difference delta between adjacent abnormal electrode rings：
Δ-/>（10）；
Calculating the distance between two adjacent abnormal electrode rings in the space as shown in (6)：
Calculating a steady flow rate：
| =k∙ | （11）。 |
In the description of the present application, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application; the terms "coupled," "mounted," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (4)
1. The working method of the three-dimensional natural potential monitoring device for seepage in the seabed comprises an anti-sedimentation plate (7), and is characterized in that a battery (1), a partition plate (3), a collecting unit (6), a transmission unit (8) and a balancing weight (2) are fixedly arranged on the upper surface of the anti-sedimentation plate (7), the partition plate (3) comprises a first partition plate (301) and a second partition plate (302), the first partition plate (301) and the second partition plate (302) are respectively fixedly arranged on the left part and the right part of the upper surface of the anti-sedimentation plate (7), the battery (1) is located on the outer side of the first partition plate (301), the collecting unit (6) and the transmission unit (8) are located on the outer side of the second partition plate (302), a plurality of balancing weights (2) are arranged between the inner sides of the first partition plate (301) and the second partition plate (302), and rope holes (5) are formed in the middle parts of the balancing weights (2) and the anti-sedimentation plate (7);
the anti-sedimentation plate is characterized in that a natural potential probe rod group is fixedly arranged on the lower surface of the anti-sedimentation plate (7), the natural potential probe rod group comprises a plurality of natural potential probe rods (4) which are vertically and downwards arranged, the bottom end of each natural potential probe rod (4) is a conical tip (404), a plurality of longitudinally distributed electrode rings (403) are arranged on the outer wall of each natural potential probe rod (4), an insulating block (402) is arranged between each electrode ring (403), and a signal wire (401) is led out from the top end of each natural potential probe rod (4) and is connected with a battery (1), an acquisition unit (6) and a transmission unit (8);
the method specifically comprises the following steps:
s1, placing all electrode rings (403) in a seawater environment, taking a ground potential as a zero potential for collected natural potential signals, and then calibrating each electrode ring (403) according to a collection result;
s2, obtaining the coupling coefficient of seepage flow velocity and potential difference through indoor testkKnowing the relation of the seepage flow velocity and the potential difference as a linear function, and recording and measuring the distance between the adjacent electrode rings (403) asL；
S3, arranging a monitoring device in the sea area to be observed, reflecting the penetration depth in real time through data, and removing and recovering the balancing weight when the probe rod is completely penetrated into the seabed;
set penetration depth ashThe length of the cone tip ise 1 The electrode ring with the difference is the first electrode ring from the conical tip to the upper parte 2 And if so, the penetration depth is as follows:
h=e 1+ e 2 L（1）
s4, each electrode ring (403) transmits the measured data to the acquisition unit (6), meanwhile, the transmission unit (8) transmits the data to the ground base station, and whether seepage occurs in the seabed, and the seepage path, the flow direction and the flow velocity can be judged through analysis and processing of the data, wherein the seepage is divided into initial seepage and stable seepage according to the state;
s5, judging the initial seepage and the stable seepage in the step S4, wherein the method specifically comprises the following steps of:
s5-1, connecting the points of the cone tips of the natural potential probe rods farthest from the transmission unit to form lines by taking the point of the cone tip of the two probe rods closest to the probe rod as an origin, wherein the points are respectivelyX、YShaft with probe rod at originZA shaft; because the natural potential value of the electrode ring on the seepage path is lower than that of the electrode ring which does not generate or is far away from seepage, the electrode ring is called an abnormal electrode ring, and meanwhile, the abnormal electrode ring is named as，/>…/>，/>The data acquired over the time sequence are +.>，/>…，/>The data acquired over the time sequence are +.>，/>…/>And so on to->The data acquired over the time sequence are +.>，/>…/>The method comprises the steps of carrying out a first treatment on the surface of the The coordinates of two abnormal electrode rings in the coordinate system are respectively ()>) And (/ ->) Is provided with->Other abnormal electrode rings and the like;
s5-2, when the seepage starts, the natural potential of the seepage front reaches the point, and the natural potential is obviously reduced; when the seepage reaches stability, the natural potential value at the seepage path is lower than the potential at the non-seepage place, so that the natural potential signal is determined to be obviously lower in all the electrode rings or is always lower than the electrode rings of other electrode ring data, namely，/>…/>；
S5-3, fitting the electrode ring into a straight line, wherein the straight line is a seepage path, determining a straight line expression of a space according to abnormal electrode ring coordinate points, and representing the seepage path by the straight line expression:
（2）
s5-4, determining seepage flow direction in initial and stable states, and specifically comprising the following steps of:
s5-4-1, when initial seepage occurs, the natural potential reduction direction of the electrode ring is the seepage direction, and the seepage direction can be represented by vectors according to the positions of two abnormal electrode rings in a space coordinate system in quadrants, namely:
（3）
s5-4-2, after the seepage channel is completely formed, namely after the seepage is stabilized, passing through any timeAnd when the electrode ring data is used for judging the seepage flow direction, the seepage flow direction can be represented by vectors according to the position of an abnormal electrode ring in a space coordinate system in a quadrant, namely:
the direction is
（4）
S5-5, determining seepage flow velocity in initial and stable states, and specifically comprising the following steps of:
s5-5-1, calculating the initial seepage flow speed as follows:
slope of each abnormal electrode ring at different timeCalculation formulaThe method is as follows:
（5）
in the method, in the process of the application,nis the number of the abnormal electrode ring,tis a certain moment;
the time corresponding to the minimum slope of each abnormal electrode ring is respectively set as，/>：
（6）；
Calculating the distance between two adjacent abnormal electrode rings in the space：
（7）
Calculating an initial flow rate：
（8）；
S5-5-2, calculating stable seepage flow velocity as follows:
calculating the average potential of each abnormal electrode ring：
（9）；
Calculating the potential difference delta between adjacent abnormal electrode rings：
Δ-/>（10）；
Calculating the distance between two adjacent abnormal electrode rings in the space as shown in (6)：
Calculating a steady flow rate：
（11）；
The anti-sedimentation plate (7) and the partition plate (3) are made of POM materials.
2. The method of claim 1, wherein the cone tip (404) is made of 316 stainless steel.
3. The method according to claim 1, wherein the insulating block (402) is made of POM material.
4. The working method of the three-dimensional natural potential monitoring device for seepage inside the seabed according to claim 1, wherein the electrode ring (403) is made of titanium alloy material.
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| DK1982047T3 (en) * | 2006-01-31 | 2019-04-23 | Ben Gurion Univ Of The Negev Research And Development Authority | VADOSE ZONE PROBE, PROCEDURE AND SYSTEM FOR MONITORING OF SOIL PROPERTIES |
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| JP2008039438A (en) * | 2006-08-02 | 2008-02-21 | Shimadzu Corp | Electrode for undersea characteristics measuring instrument |
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