River channel slope toe scouring real-time monitoring device based on impedance measurement

Abstract

The invention provides a real-time monitoring device for river slope toe scouring based on impedance measurement. The real-time monitoring device comprises a measuring rod, a resistivity measuring electrode, a resistivity signal transmission line, a signal transmitter and a monitoring computer, the measuring rod is used for being buried in a slope toe of a river section to be monitored, a plurality of resistivity measuring electrodes are evenly distributed on the measuring rod at intervals and are in communication connection with the signal transmitter through resistivity signal transmission lines, the signal transmitter is in communication connection with the monitoring computer, and the resistivity measuring electrodes are used for measuring the resistivity of water or soil. The signal transmitter transmits the resistivity measured by the resistivity measuring electrode to the monitoring computer, and the monitoring computer is used for acquiring the scouring distance and the slope toe scouring rate according to the change condition of the resistivity after the slope toe soil body is scoured. The river channel slope toe scouring degree is monitored through the difference and change of the river bed resistivity and the water body resistivity, the river channel slope toe scouring condition can be rapidly and timely monitored, support is provided for river channel flood control safety, and the method has important practical significance.

Description

Technical Field

[0001] The invention relates to the field of river channel monitoring, and in particular to a real-time monitoring device for river channel slope foot scour based on impedance measurement. Background Art

[0002] Under the influence of climate change and human activities, especially the strong human activities such as damming and soil and water conservation, the sediment transport of rivers has generally decreased, causing river scouring, among which the rivers in the alluvial plains downstream of large reservoirs are most affected. Continuous river scouring can easily cause bank collapse in alluvial plain rivers, thus threatening flood control safety, smooth navigation and the normal operation of economic infrastructure along the river.

[0003] A large number of studies have found that the scouring rate of the river channel foot is an important factor affecting bank collapse. Therefore, monitoring and mastering the scouring situation of the river channel foot is of great significance for conducting bank collapse risk assessment and prediction and early warning. At present, the usual way to monitor the scouring of the river channel foot is to use river channel topography measurement. By comparing the results of topography measurement at different times, the scouring distance and scouring rate of the river channel foot can be obtained. However, river channel topography measurement is costly and time-consuming. In addition, there are safety risks in topography measurement during the flood season when scouring is severe and the risk of bank collapse is high. It is difficult to timely grasp the changes in the scouring of the river channel foot. Summary of the invention

[0004] The present invention provides a real-time monitoring device for river channel slope foot scour based on impedance measurement, which can quickly and timely monitor the river channel slope foot scour situation and provide support for river channel flood control safety.

[0005] A real-time monitoring device for scour at the foot of a river channel slope based on impedance measurement comprises a measuring rod, a resistivity measuring electrode, a resistivity signal transmission line, a signal transmitter, and a monitoring computer; the measuring rod is used to be buried at the foot of the slope of a river channel section to be monitored, a plurality of resistivity measuring electrodes are evenly arranged on the measuring rod, the plurality of resistivity measuring electrodes are respectively communicatively connected to the signal transmitter via the resistivity signal transmission line, the signal transmitter is communicatively connected to the monitoring computer, the resistivity measuring electrode is used to measure the resistivity of water or soil, the signal transmitter transmits the resistivity measured by the resistivity measuring electrode to the monitoring computer, and the monitoring computer is used to obtain the scour distance and the scour rate at the foot of the slope according to the change in resistivity of the soil at the foot of the slope after scour occurs.

[0006] Furthermore, the signal transmitter is connected to the monitoring computer via a wireless communication network.

[0007] Furthermore, the distance between two adjacent resistivity measuring electrodes is d, and the monitoring computer reads the resistivity measurement value of each resistivity measuring electrode 2 once every t days, and determines that the resistivity measuring electrode whose resistivity measurement value decreases beyond a preset threshold value becomes in the water body due to scour, and multiplies the determined amount of resistivity measuring electrodes in the water body by d to obtain the scour distance L of the measuring rod exposed due to scour, and divides the scour distance L by the observation interval time t to obtain the scour rate at the slope foot.

[0008] The present invention utilizes the difference and change between the resistivity of the riverbed and the resistivity of the water body to monitor the degree of scouring of the river slope foot, which can quickly and timely monitor the scouring of the river slope foot, provide support for river flood control safety, and has important practical significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of a real-time monitoring device for river channel slope foot scour based on impedance measurement of the present invention;

[0010] Figure 2 It is a working schematic diagram of the real-time monitoring device for river channel slope foot scour based on impedance measurement of the present invention;

[0011] Figure 3 It is a schematic diagram of the change in the resistivity measurement results of the measuring electrodes before and after the river bank foot is scoured according to an embodiment of the present invention. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0013] See also Figure 1 An embodiment of the present invention provides a real-time monitoring device for river channel slope foot scour based on impedance measurement, including a measuring rod 1, a resistivity measuring electrode 2, a resistivity signal transmission line 3, a signal transmitter 4, and a monitoring computer 5.

[0014] A plurality of resistivity measuring electrodes 2 are evenly arranged on the measuring rod 1. The spacing of the resistivity measuring electrodes 2 and the length of the measuring rod 1 can be adjusted according to the scouring intensity of the monitored river section. The earth is used as the other electrode, and the resistivity of water or soil is measured through these two electrodes. Then, the resistivity measured by each resistivity measuring electrode 2 is transmitted to the signal transmitter 4 through the resistivity signal transmission line 3, and the signal transmitter 4 is then transmitted to the monitoring computer 5 through the wireless communication network, so as to obtain the resistivity measured by each resistivity measuring electrode 2 in the measuring rod in real time.

[0015] Since the resistivity of soil and water is very different, when the soil at the foot of the river slope is eroded, part of the resistivity measurement poles previously in the soil are exposed to the water, causing the measured resistivity to change. By comparing the changes in resistivity, the data of the erosion distance of the river slope foot can be obtained, and combined with the erosion time, the erosion rate can be obtained.

[0016] like Figure 2 As shown, the working process of the real-time monitoring device for river channel slope foot scour based on impedance measurement of the present invention is as follows:

[0017] 1. Bury the measuring rod 1 horizontally at the foot of the slope of the river section to be monitored;

[0018] 2. Start the whole set of equipment and record the resistivity results of each resistivity measuring electrode 2 (assuming there are measuring electrodes ① to ⑩ and the distance between the measuring electrodes is d);

[0019] 3. Read the resistivity results of each resistivity measuring electrode 2 from ① to ⑩ once every t days (the frequency can be adjusted according to the scouring intensity of the monitored river section and monitoring needs);

[0020] 4. Compare the two results and find the probes whose resistivity measurements are significantly reduced, indicating that these probes have been changed from being in the soil to being in the water due to scouring, causing the measured resistivity to decrease. Figure 3 As shown, after the river bank is scoured, the resistivity measurement results of the measuring poles numbered 1-3 are significantly reduced (for example, the reduction exceeds a preset threshold), so it can be determined that the measuring pole probes numbered 1-3, a total of 3 measuring pole probes, are in the water body due to scour;

[0021] 5. The number of measuring pole probes with significantly reduced resistivity multiplied by d is the length of the measuring rod exposed due to scouring, that is, the scouring distance L. The scouring distance L is divided by the observation interval time t to obtain the scouring rate of the slope foot.

[0022] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A real-time monitoring device for river channel slope foot scour based on impedance measurement, characterized in that: The invention comprises a measuring rod (1), a resistivity measuring electrode (2), a resistivity signal transmission line (3), a signal transmitter (4), and a monitoring computer (5); the measuring rod (1) is used to be buried at the foot of a slope of a river section to be monitored; a plurality of resistivity measuring electrodes (2) are evenly arranged on the measuring rod (1); the plurality of resistivity measuring electrodes (2) are respectively connected to the signal transmitter (4) through the resistivity signal transmission line (3); the signal transmitter (4) is connected to the monitoring computer (5); the resistivity measuring electrode (2) is used to measure the resistivity of water or soil; the signal transmitter (4) transmits the resistivity measured by the resistivity measuring electrode (2) to the monitoring computer (5); the monitoring computer (5) is used to obtain the scouring distance and the scouring rate of the slope foot according to the change of the resistivity of the soil at the slope foot after scouring occurs.

2. The real-time monitoring device for river channel slope foot scour based on impedance measurement according to claim 1, characterized in that: The signal transmitter (4) is communicatively connected to the monitoring computer (5) via a wireless communication network.

3. The real-time monitoring device for river channel slope foot scour based on impedance measurement according to claim 1, characterized in that: The distance between two adjacent resistivity measuring electrodes (2) is d. The monitoring computer (5) reads the resistivity measurement value of each resistivity measuring electrode 2 once every t days, and determines that the resistivity measuring electrode (2) whose resistivity measurement value decreases beyond a preset threshold value becomes in the water body due to scouring. The determined amount of the resistivity measuring electrode (2) in the water body is multiplied by d to obtain the scouring distance L of the measuring rod (1) exposed due to scouring. The scouring distance L is divided by the observation interval time t to obtain the slope foot scouring rate.

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