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Method for calculating suitable area of river fish habitat based on ecological habits

A technology of fish habitat and calculation method, which is applied in the field of calculation of suitable area of ​​fish habitat in rivers, and can solve problems such as small size, suitable area of ​​habitat does not conform to the actual situation of fish habitat, and HSI value is too large

Pending Publication Date: 2021-05-07
POWERCHINA BEIJING ENG
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Problems solved by technology

Traditional methods generally use the maximum value method, minimum value method, geometric mean method, and multiplication method to calculate the fish habitat suitability index HSI. In line with the actual situation of fish habitat

Method used

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  • Method for calculating suitable area of river fish habitat based on ecological habits
  • Method for calculating suitable area of river fish habitat based on ecological habits
  • Method for calculating suitable area of river fish habitat based on ecological habits

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example

[0040] The present invention takes a certain spawning ground of a certain river as the research section, and the length is 1.0km. The method of the invention is adopted to calculate the suitable area (WUA) of the fish spawning breeding period habitat, and correspondingly obtain the ecological flow rate in the spawning period. The method of the present invention is described below:

[0041] (1) A 1.0km-long spawning ground in a certain river was selected as the research river section, and the target fish were the main local fish.

[0042] (2) For the screened target fish, according to the biological characteristics of fish and important habitat characteristics, environmental factors such as flow velocity, water depth, and bottom quality are selected as evaluation indicators for calculating the suitable area of ​​fish habitat.

[0043] (3) For the selected environmental factors, construct a single-factor suitability index SI function, and combine fish preferences for different ...

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Abstract

The invention discloses an ecological habit-based river fish habitat appropriate area calculation method, and the method comprises the following steps: firstly, investigating a fish resource current situation and a fish habitat current situation of a research area, and determining a habitat range and target fishes; according to the ecological habits of the target fishes and the important habitat characteristics of the habitat, selecting water depth, flow velocity and substrate as calculation indexes of the suitable area of the fish habitat; establishing a response relationship between the target fish and each key environmental factor by adopting an experiment or expert method, and constructing a single-factor suitability function for each key environmental factor; constructing a fish habitat suitability comprehensive index by adopting an arithmetic mean value method; calculating the suitable area of the fish habitat under different flow conditions by using the comprehensive indexes of the suitability of the fish habitat, and obtaining the maximum suitable area of the fish habitat and the corresponding ecological flow. On the basis of the single-factor suitability function, the arithmetic mean value method is used for calculation, and the calculation result better conforms to the actual situation.

Description

technical field [0001] The invention relates to river fish habitats, in particular to a method for calculating the suitable area of ​​river fish habitats based on ecological characteristics. Background technique [0002] River habitats have diverse aquatic habitats that provide the necessary environmental conditions for fish breeding, feeding and overwintering. The construction of hydropower and water conservancy projects will change the hydrological regime of the river section where the project is located, resulting in changes in the environmental conditions of the river fish habitat, thereby affecting the survival of fish. In order to better protect the habitat of river fish, it is necessary to calculate and evaluate the habitat suitability and habitat area under different flows of hydropower and water conservancy projects, so as to determine the maximum area of ​​habitat suitability and its corresponding ecological flow, Evaluate the effectiveness of habitat protection a...

Claims

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Application Information

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IPC IPC(8): G06Q10/04G06Q50/02
CPCG06Q10/04G06Q50/02
Inventor 金弈张志广常毅董磊华黎一霏谭奇林王猛张东亚张沙龙孔勇
Owner POWERCHINA BEIJING ENG
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