Polymorphic moving bed river channel control test device

Abstract

The utility model relates to a multi-form moving bed river channel control test device. The device comprises river channel pools A and B, overflow tanks A and B; water return pools A and B; a moving bed substrate layer; a sand blocking net; a water temperature sensor group; a water quality monitor; an underflow pump; a water return pipe; the utility model discloses an electromagnetic flowmeter. Wherein the riverway pools A and B are respectively connected and communicated with the overflow pools A and B and the water return pools A and B. The river channel pools A and B are filled with moving bed matrix materials and are provided with a plurality of water temperature sensor groups, and the water return pools A and B are internally provided with submersible pumps and water quality monitors and are communicated with the overflow pools A and B through the water return pipelines A and B. According to the utility model, various different forms of moving bed river channel control groups can be arranged, and the independent water return systems are utilized to carry out long-duration control tests with the same or different flows, so that the comparison conditions of various indexes among the different forms of moving bed river channels can be observed; and a relatively complete control test device is provided for the research on multi-form moving bed river hydraulics.

Description

Technical Field

[0001] The utility model relates to a multi - form movable - bed river channel contrast test device, belonging to the technical field of river water body research. Background Technique

[0002] Through natural development, river systems often evolve into various forms. The indicators describing river forms usually include: river curvature, river slope, river cross - section morphology, riverbed material, bank slope protection form, and shoals, wetlands, waterfalls, etc. These rivers with rich forms play a key role in the balance and healthy development of basin water volume, ecology, and environment, and undertake functions such as flood control, waterlogging drainage, water supply, shipping, environmental beautification, climate improvement, providing biological habitats, and providing hydrophilic leisure spaces. Since ancient times, they have been an important part of the development of towns, basins, and civilizations.

[0003] However, with the rapid economic and social development of our country, there are varying degrees of occupation of many grasslands, woodlands, farmlands, lakes, etc. inside and around cities. Especially for natural river channels, the phenomena of changing the natural form of rivers, large - scale hardening and standardization of river cross - sections, straightening curved rivers, burying above - ground river channels underground through culverts, and even overall landfill of some river sections and occupation of river channel resources are common, which bring great negative impacts on urban flood control and drainage, river water quality, basin ecology, etc. Among them, the water environment problems caused by the simplification of river forms are the most prominent.

[0004] Currently, the physical model test research on river forms mainly focuses on fixed - bed models, which are difficult to imitate the changing state of rivers after long - term scouring. Most of the existing granular matrix river channel model test devices are single - river - channel devices, and only the test research on one river channel can be carried out each time during operation, and the contrast test of different - form river channels cannot be carried out under the same boundary conditions.

[0005] Therefore, in order to study the relationship between multi - form rivers and water systems in water bodies, and observe the comparison of indicators such as scouring, sedimentation, water temperature, water quality, hydrodynamic force, and water ecology among movable - bed river channels with various forms such as different bending degrees, different bank slope materials, different river cross - sections, different matrix compositions, different plant compositions, and different water - blocking forms, it is very necessary to design a multi - form movable - bed river channel contrast test device that can carry out long - term contrast tests. Summary of the Invention

[0006] Aiming at the deficiencies existing in the prior art, the utility model provides a multi - form movable - bed river channel contrast test device. This device can set control groups of bank slope materials with different textures according to test needs, construct river water system structures or bank slope forms with different forms, and carry out contrast tests on pollutant concentration reduction, solute transport law, change of hydraulic state, etc. under specified conditions. The specific technical solutions are as follows:

[0007] A multi - morphological movable - bed river channel control test device includes a river channel pool A, a river channel pool B, an overflow pool A, an overflow pool B, a return water pool A, and a return water pool B. The overflow pool A is located on one side of the river channel pool A and is connected to the river channel pool A. The return water pool A is located on the other side of the river channel pool A and is connected to the river channel pool A. The overflow pool B is located on one side of the river channel pool B and is connected to the river channel pool B. The return water pool B is located on the other side of the river channel pool B and is connected to the river channel pool B. The river channel pool A, the overflow pool A, and the return water pool A are respectively connected to the river channel pool B, the overflow pool B, and the return water pool B. The river channel pool A and the river channel pool B are filled with movable - bed matrix materials. On one side of each of the river channel pool A and the river channel pool B, there are multiple water temperature sensor groups. One end of each water temperature sensor group is arranged in the matrix materials of the river channel pool A and the river channel pool B, and the other end of each water temperature sensor group is connected to a computer. A submersible pump and a water quality monitor are provided in the return water pool A. The water inlet position of the submersible pump is lower than the water surface height of the return water pool A. The water outlet of the submersible pump is connected to a return water pipe A, and the other end of the return water pipe A communicates with the overflow pool A. A submersible pump and a water quality monitor are provided in the return water pool B. The water inlet position of the submersible pump is lower than the water surface height of the return water pool B. The water outlet of the submersible pump is connected to a return water pipe B, and the other end of the return water pipe B communicates with the overflow pool B. Electromagnetic flow meters are connected in the return water pipes A and B.

[0008] As an improvement of the above - mentioned technical solution, an overflow trough is provided for connection between the overflow pool A and the river channel pool A and between the overflow pool B and the river channel pool B. A return water trough is provided for connection between the river channel pool A and the return water pool A and between the river channel pool B and the return water pool B. A sand - retaining net is arranged at the return water trough.

[0009] The beneficial effects of the utility model are as follows:

[0010] 1) The device is provided with river channel pools. In the pools, various movable - bed river channel materials, such as sand, clay, gravel, or mixed materials with different gradations, can be laid according to the needs of the control test to simulate the matrix composition form of the actual river, and a complete and continuous river water flow - through state can be achieved through the return water device.

[0011] 2) The device is provided with two sets of overflow pools, river channel pools, and return water pools, and each has an independent return water system, which can realize control experiments for different - shaped river channels under the same boundary conditions such as air temperature, humidity, flow rate, and flow velocity; it can also realize control tests with variable flow rates and flow velocities for the same - shaped river channels.

[0012] 3) Multiple water temperature sensor groups are provided in the river channel pools, which can be set at designated positions in the river channel or the river bank slope according to the test needs to monitor the temperature changes in the two control river channel systems, so as to judge the migration and distribution process of pore water in different - shaped river channel systems. Description of the Drawings

[0013] Figure 1 It is a structural schematic diagram of the multi - morphological movable - bed river channel contrast test device of the present utility model;

[0014] Figure 2 It is a longitudinal sectional schematic diagram of the multi - morphological movable - bed river channel contrast test device of the present utility model. Specific embodiments

[0015] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0016] As Figure 1 、 2 shown, the multi - morphological movable - bed river channel contrast test device includes a river channel pool A1, a river channel pool B2, an overflow pool A3, an overflow pool B4, a return pool A5, and a return pool B6. The overflow pool A3 is located on one side of the river channel pool A1 and is connected to the river channel pool A1. The return pool A5 is located on the other side of the river channel pool A1 and is connected to the river channel pool A1. The overflow pool B4 is located on one side of the river channel pool B2 and is connected to the river channel pool B2. The return pool B6 is located on the other side of the river channel pool B2 and is connected to the river channel pool B2. The river channel pool A1, the overflow pool A3, and the return pool A5 are respectively connected to the river channel pool B2, the overflow pool B4, and the return pool B6. The river channel pool A1 and the river channel pool B2 are filled with movable - bed substrate materials 7. On one side of each of the river channel pool A1 and the river channel pool B2, there are multiple water temperature sensor groups 8. One end of the water temperature sensor group is arranged in the substrate material 7 of the river channel pool A1 and the river channel pool B2, and the other end of the water temperature sensor group 8 is connected to a computer. In the return pool A5, there is a submersible pump 9 and a water quality monitor 10. The water inlet position of the submersible pump 9 is lower than the water surface height of the return pool A5. The water outlet of the submersible pump 9 is connected to a return water pipe A11, and the other end of the return water pipe A11 communicates with the overflow pool A3. In the return pool B6, there is a submersible pump 9 and a water quality monitor 10. The water inlet position of the submersible pump 9 is lower than the water surface height of the return pool B6. The water outlet of the submersible pump 9 is connected to a return water pipe B12, and the other end of the return water pipe B12 communicates with the overflow pool B4. Electromagnetic flow meters 14 are connected in the return water pipes A11 and B12.

[0017] The inner dimensions of the river channel pools A1 and B2 are the same, with the length, width and height being 400 cm, 200 cm and 50 cm respectively; the inner dimensions of the overflow pools A3, B4, the return water pools A5 and B6 are the same, with the length, width and height being 150 cm, 30 cm and 50 cm respectively; the overflow pool A3 is connected to the river channel pool A1, and the overflow pool B4 is connected to the river channel pool B2 through overflow troughs with a width of 10 cm. The river channel pool A1 is connected to the return water pool A5, and the river channel pool B2 is connected to the return water pool B6 through return water troughs with a width of 10 cm; a nylon mesh with a pore size of about 48 microns (300 mesh) is set at the return water trough as the sand retaining net 13. The main structure of the device is constructed by bricks and cement mortar, and waterproof materials are applied to each pool to ensure water impermeability.

[0018] Four groups of the water temperature sensor groups 8 are respectively arranged in the river channel pools A1 and B2, and are respectively arranged at key nodes. The water temperature sensor groups 8 can be automatically uploaded to the computer at a rate of once per second to monitor the change trend of water temperature and be used to calculate the subsurface flow process.

[0019] According to the test requirements, simulating the substrate composition form of the actual river, various movable bed river materials such as sand, clay, gravel or mixed materials with different gradations are filled in the river channel pools A1 and B2, and movable bed rivers with various different forms such as different bending degrees, different bank slope materials, different river channel cross-sections, different substrate compositions, different plant compositions, and different water blocking forms are dug. The submersible pumps in the return water pools A5 and B6 are started to carry out control tests to explore the comparison of indexes such as scouring, siltation, water temperature, water quality, water power, and water ecology between different forms of river channels.

[0020] Through the design of the present utility model, control groups of movable bed rivers with various different forms such as different bending degrees, different bank slope materials, different river channel cross-sections, different substrate compositions, different plant compositions, and different water blocking forms can be set, and by using their respective independent return water systems, long-term control tests with the same or different flow rates and flow velocities can be carried out to observe the comparison of indexes such as scouring, siltation, water temperature, water quality, water power, and water ecology between different forms of movable bed rivers, providing a relatively complete control test device for the research on the hydraulics and water environment of multi-form movable bed rivers.

[0021] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A multi-form moving bed river channel control test device, characterized in that: It includes a river pool A (1), a river pool B (2), an overflow pool A (3), an overflow pool B (4), a return pool A (5), and a return pool B (6); The overflow pool A (3) is located on one side of the river pool A (1) and is connected to the river pool A (1), and the return pool A (5) is located on the other side of the river pool A (1) and is connected to the river pool A (1); The overflow pool B (4) is located on one side of the river pool B (2) and is connected to the river pool B (2), and the return pool B (6) is located on the other side of the river pool B (2) and is connected to the river pool B (2).

2. A multi-form moving bed river channel control test device according to claim 1, characterized in that: The channel pool A (1) and the channel pool B (2) are filled with a moving bed matrix material (7). The channel pool A (1) and the channel pool B (2) are each provided with a plurality of water temperature sensor groups (8). One end of the water temperature sensor group is arranged in the matrix material (7) of the channel pool A (1) and the channel pool B (2), and the other end of the water temperature sensor group (8) is connected to a computer.

3. A multi-form moving bed river channel control test device according to claim 1, characterized in that: The return water pool A (5) and the return water pool B (6) are both provided with a submersible pump (9) and a water quality monitor (10). The water inlet of the submersible pump (9) is located lower than the water surface of the return water pool A (5) and the return water pool B (6). The water outlet of the submersible pump (9) of the return water tank A (5) is connected to the return water pipe A (11), and the other end of the return water pipe A (11) is connected to the overflow tank A (3); The water outlet of the submersible pump (9) of the return water tank B (6) is connected to the return water pipe B (12), and the other end of the return water pipe B (12) is connected to the overflow tank B (4).

4. A multi-form moving bed river channel control test device according to claim 3, characterized in that: The return water pipe A (11) and the return water pipe B (12) are both connected to an electromagnetic flow meter (14).

5. The multi-form moving bed river channel control test device according to claim 1, characterized in that: An overflow trough is provided between the overflow pool A (3) and the river pool A (1), and between the overflow pool B (4) and the river pool B (2). A return trough is provided between the river pool A (1) and the return pool A (5), and between the river pool B (2) and the return pool B (6).

6. A multi-form moving bed river channel control test device according to claim 5, characterized in that: A sand trap (13) is provided at the return water trough.

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