Method for improving water temperature stratification characteristic of channel reservoir tributary bay by internal wave

Abstract

The invention belongs to the technical field of improvement and restoration of reservoir water ecology, and relates to a method for improving water temperature stratification characteristic of a channel reservoir tributary bay by internal wave. During a water temperature stratification period of the tributary bay, fluctuation is generated from letdown flow, and water level of a reservoir fluctuates, so that tide is formed at the estuary of the tributary bay. Tide type inflow and outflow are formed between the bay and a trunk reservoir and have shear effect at the thermocline, so that tide interval wave is generated near the thermocline. Water of the thermocline flows reversely since the tide internal wave transmits along the thermocline, so that alternate flow is generated, water temperature fields are mixed, and then water temperature stratification is improved. Deepwater reservoir equal-density stratification water is aroused to generate internal wave under reservoir regulation, andthus natural underwater stirring movement is formed. The method is easy to implement, has influence to large-scope water, improves water dynamic strength remarkably, suppresses water temperature stratification and achieves the purposes of improving water ecological environments.

Description

Technical field [0001] The present invention belongs to the field of improvement and restoration technology of the lake reservoir water ecology. Specifically, it is a way to use the internal waves to improve the characteristics of the river temperature layered characteristics of the river -type reservoir. Background technique [0002] After the completion of the river reservoir, the tributary was topped by the dry flow water level to form Kuwan.The water flow rate is very slow (only millimeterweight), the water depth (up to 100 meters), its water power characteristics are similar to deep water lakes, the water temperature layer is significant, it is easy to form a stable layered water body, and stable layered water bodies are from top to top.The bottom is divided into temperature variables, temperature jump layers and stagnation.Water temperature is the main factors of algae growth. The temperature leap layer formed by the layered water temperature will lead to the jump layer of ...

AI Technical Summary

Problems solved by technology

The dissolved oxygen content in the lower part of the thermocline decreases and the concentration of carbon dioxide increases, forming a reducing environment, causing changes in the types, quantities, and distribution of plankton and aquatic plants. The release of low-temperature water may also cause delays in the spawning period of fish and lower spawning rates. The lowering will slow down the metabolism of crops in the irrigation area and reduce the yield, which will bring many disadvantages to the water ecology and water environment in the downstream of the dam site.

[0003] As for the ecological environment problems caused by water temperature stratification and low-temperature water discharge, engineering measures are mainly adopted at present, such as stratified water intake, stacking gates, dynamic stirring, aeration and other methods for local water intakes. The water temperature is appropriately increased, but these measures cannot change the temperature stratification of the large-volume water area in the reservoir area, and cannot improve the ecological environment of the large-scale water body in the reservoir area.

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