Method for re-suspending underwater deposit under simulated wave disturbance in annular water tank and device thereof

Abstract

The invention discloses a method for disturbing and resuspending underwater sediments with simulated wave in circular sink, which is characterized in that: place the sediments collected without disturbance at the bottom of the circular sink; plant submerged plant over the sediments and overlaying water; use a plurality of blowers to simulate different wind forces and apply it on the overlaying water, so as to generate water flow; adjust the position of the blower port and its included angle with the overlay water surface to make basically even flow field in the sink; the sediments at the bottom of the sink is resuspended under the action of hydrodynamic force, so as to realize the simulation for the resuspension of sediments under the disturbance of wave with different forces in the water body of lake and river where submerged plant grows. The invention has the flowing advantages: simulate the resuspension process of sediments due to the motion of flow field under the disturbance of wave with different forces in natural water body of lake and river where submerged plant grows; realize the collection of samples in water body of different depths under relative stable condition for the resuspension of sediments; meet the requirements for the study over the ration relations among wave disturbance-motion of flow field-resuspension of sediments; simple structure, low cost and convenient application of relevant device.

Description

technical field [0001] The invention relates to the simulation of the water body ecological environment of shallow lakes and river systems, in particular to a method and a device for resuspending sediments under the disturbance of different intensities of wind waves in water bodies such as lakes and rivers where submerged plants grow by using an annular water tank. Background technique [0002] Sediment is an important destination and reservoir of nutrients and other pollutants in lakes and watersheds. Nutrients go through a series of physical, chemical and biological processes, and some of them are deposited at the bottom of lakes, becoming the internal load of nutrients in lakes. For shallow lakes and rivers, external dynamic disturbances (wind, waves, etc.) tend to resuspend the surface sediments at the bottom of the water body, which has a great impact on the physical, chemical and biological properties of the water body-sediment interface and the ecological environment c...

AI Technical Summary

Problems solved by technology

In the method of simulating external dynamic disturbance, the propeller type uses the propeller to disturb the movement of the water body in the water and then causes the sediment to suspend; The oscillation of the device causes the sediment to suspend, and the wave-making type uses the waves generated by the wave-making machine to disturb the sediment to make it suspend. It can be seen that the propeller type, piston type, and oscillation type are all simulated by directly disturbing the water body with mechanical force The disturbance of water bodies and sediments by wind and waves is obviously very different from the actual situation. Although the wave-making method is close to the actual situation, the wave-making device is complicated and expensive

Among the methods for simulating natural water bodies, the triangular bottle type and straight pipe type obviously have considerable limitations, and cannot reflect the flow field conditions of the water body under wind and wave disturbance, so it is impossible to study wind wave disturbance-flow field movement-sediment regeneration. The quantitative relationship between the suspension and the natural water body simulated by the tank type is close to the actual situation. However, because the wave-making method is used to simulate the dynamic disturbance in the current tank-type simulation method, the structure is often complicated, the cost is expensive, and the operation is cumbersome.

In addition, in lakes and rivers where submerged plants grow, submerged plants have a great influence on the resuspension of sediments, and the current indoor simulation methods have failed to realize the resuspension of sediments in water bodies with submerged plants. simulation of

Images