Branch alternative habitat construction method based on dam dismantling and local micro-landform manual intervention

Abstract

The invention discloses a branch alternative habitat construction method based on dam dismantling and local micro-landform manual intervention, which comprises the following steps: (1) selecting a branch which is most similar to fish community structure characteristics and habitat heterogeneity of a target main stream from branches of the target main stream as an alternative habitat branch; (2) constructing a one-dimensional ecological river appearance model for replacing habitat tributary, and simulating river appearance change and habitat quality change of the replaced habitat tributary after dam removal; (3) constructing a two-dimensional ecological river appearance evolution model for the local river reach of which the habitat quality is lower than a preset threshold value after dam removal of the alternative habitat tributary, and simulating the river appearance change and habitat quality change of the local river reach after different local ecological improvement measures are implemented; and (4) removing the dam selected as the tributary for replacing the habitat, and reconstructing the landform of the local river reach according to the ecological improvement measure with the maximum habitat quality improvement obtained by simulation. According to the invention, a branch alternative habitat more suitable for fishes can be constructed.

Description

technical field [0001] The invention relates to water conservancy and environmental engineering, in particular to a tributary replacement habitat construction method based on dam demolition and local micro-landform artificial intervention. Background technique [0002] As an important means for humans to transform and utilize nature, water conservancy projects have made important contributions to the progress of human society in terms of flood control, power generation, shipping, and water transfer in river basins. However, the construction of more and more barrages has also brought different degrees of impact on the regional ecological environment, among which the construction of cascade hydropower stations has the most severe impact on the ecological environment. With the improvement of people's awareness of environmental protection, the ecological environment protection in the process of hydropower development has gradually become the focus of people's attention, especial...

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Problems solved by technology

Restricted by factors such as the level of scientific understanding, technical level, and management difficulty at the present stage, these engineering measures are still difficult to fundamentally solve the problem of fish diversity loss due to habitat fragmentation and destruction.

In recent years, tributary habitat replacement protection, as a new idea of ​​ecological environment protection in hydropower development, has gradually attracted people's attention. However, there are few studies at present, and the effect after implementation cannot be estimated before implementation, which leads to difficulties in implementation.

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