Constructing method for fish shelter under stress of high silt concentration flood

Abstract

The invention provides a constructing method for a fish shelter under the stress of high silt concentration flood. The constructing method comprises the following steps that a suitable river reach is selected according to the water area fish resource state, a flood plain tidal wetland system is artificially constructed by adopting an ecological engineering measure, and the flood plain wetland hydrologic connectivity is improved so that the stress of the high silt concentration flood on fish can be avoided, specifically, A, the fish which needs protecting and the required habitat condition of the target fish are determined; B, the site of a shelter is selected; and C, the shelter is constructed. According to the fish shelter constructing method under the stress of the high silt concentration flood, a natural river bend on one side of a river bed and a wide river channel of a wetland can serve as construction areas under the condition that flood drainage is not affected; the continuity of the river channel is restored by excavating an overflow weir; the complexity and the hydrologic condition diversity of the river channel are improved; the shelter for sheltering the fish and other aquatic animals from the high silt concentration flood is provided; conservation of the species of the aquatic animals in a river is facilitated; and the contradiction between river water silt regulation and fish habitat protection can be effectively relieved.

Description

Technical field [0001] The invention belongs to the field of ecological restoration of sediment-laden rivers, and specifically relates to the construction of a fish shelter under the stress of high-sand-containing floods, and also relates to a fish resource conservation technology that adopts ecological engineering measures to artificially create a floodplain coastal wetland system. Background technique [0002] Generally, rivers are divided into four types according to the plane shape: wandering, curved, straight and branched. The wandering river bed is wide and shallow, and there are many sandy beaches. When floods occur, the rivers are densely covered and relatively stable and straight. During the flood period, the riverbed flooded the staggered beaches, and the river flowed straight. Natural rivers are cut and straightened, and the channel narrows and deepens, which increases the water flow speed, facilitates erosion and siltation, and effectively dredges the channel. Howeve...

AI Technical Summary

Problems solved by technology

However, the formation of narrow and deep river channels has a serious negative effect on the protection of river water ecology.

The flow capacity of the main channel is increased, the chance of flooding is reduced, and the lateral overflow of the mainstream during the water diversion period is cut off, making it impossible to connect the mainstream with the floodplain, wetland, still water area and river branch, and make the water flow near the river bypass the wetland. The process of nutrient filtration and absorption is hindered, and fish cannot enter the beach to spawn and forage during the flood period, and also lose the refuge from the risk of flooding

Images