Research and Application of Instream Ecological Water Requirement Based on Fish Biomass Method
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Abstract:
The contradiction between the river resource development and ecological protection is becoming increasingly conspicuous, and therefore research on the ecological water requirement is needed. In this paper, a method for determining the river ecological water requirement process based on fish biomass was proposed. Through the suitability analysis of fish habitat, the relationship between the single-target fish biomass during the specific life history and the river discharge was developed, which can be used to determine the water demand of the target fish for maintaining a certain biomass amount in the particular biological life history. Moreover, the weight relationship between the multi-target fish and the fish life history was established. By matching the needed river discharge for all target fishes in each life history with the corresponding weight coefficients in or among the fish fingerlings, the ecological water requirement process for the regional river was obtained. The method was applied in the water reduced reach of the Jinping Bay in the Yalong River to determine the ecological water requirement to maintain the stable fish biomass in the reach and the ecological water requirement process lines corresponding to different fish biomass conservation.
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