Method for constructing deep pool and shoal in straight river channel

Abstract

The invention relates to a method for constructing a deep pool and a shoal in a straight river channel. In the method, a spur dike is arranged on the left bank side of the straight river channel, a bank slope on the opposite bank of the spur dike is protected by riprap, a diving guide wall is arranged on the left and right banks of the downstream side of the spur dike respectively, the discharge cross section of the river channel is shortened by the spur dike to increase the flow rate of water flow, the bottom of a river bed of a river reach between the diving guide walls on the downstream side of the spur dike is continuously scoured to naturally form the deep pool, and a dead water area or slow flow water area formed between the diving guide wall and the river bank becomes the shoal through long-term deposition. The method has the advantages that: the deep pool is naturally formed and becomes a rest place for aquatic organisms such as fishes and the like, and can become a shelter for the aquatic organisms such as the fishes and the like in a flood period; plants can be planted on the shoal, and the shoal can become an organism habitat different from the deep pool; and the complexity of a river channel structure and water conservation condition diversity can be increased or repaired, and river biodiversity, population composition and rare species conservation are facilitated.

Description

technical field [0001] The invention relates to a method for constructing deep pools and shoals in straight river courses. It belongs to the technical field of ecological river course construction. Background technique [0002] In natural rivers, deep pools and shoals exist alternately. In the shoal habitat, the water flow is turbulent, which is conducive to the aeration and oxygenation of the river water body, and the light and heat conditions are superior. There are many kinds of algae and aquatic insects on the shoal, providing fish with It provides a good foraging place for birds, amphibians and insects to inhabit and fish to lay eggs; in the habitat of deep pools, the water flow is slow, which is a good place for fish and various molluscs to rest, and it is also a good place for fish to rest during floods. The main places where aquatic organisms take refuge. The alternate existence of shoals and deep pools in the river can form different flow rates and habitats in the...

AI Technical Summary

Problems solved by technology

However, the construction methods of these deep pools and shoals are only suitable for meandering natural rivers. For straight rivers after artificial transformation, due to problems such as hydraulic conditions and erosion-silting balance, these technologies are not applicable, or even if implemented It will not last long, for example, the excavated deep pools will be filled by silt deposits, and plant rocks will be buried by silt deposits, etc.

At present, the construction technology of deep pools and shoals in straight channels is relatively rare

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