Calculating ecological flow based on key functional group
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Abstract:
The study of ecological flow is a hot field in ecology and hydrology . However, the existing methodologies do not consider the functional integrity of an eco-system. In this study , we simulated the nutritional relationships between the communities of an eco-system in Xiao qinghe river basin using the model of Ecopath. After determining the key fishes, we analyzed the velo city and water level demand of the key fishes by the habitat suitable index. Finally,coupling the velo city and water level demand of multiple species, we calculated the eco-flow by the Adapted Ecological Hydraulic Radius Approach. The results showed that the water requirements of the upper, middle, and lower reaches were 4.28 m3/s, 0.74 m3/s, and 3.47 m3/s respectively in nonspawning season, and 23.52 m3/s, 5.96 m3/s ( or 8.65 m3/s) , 37.38 m3/s respectively in spawning season. Compared with the approach of Tennant, our method could keep the ecosystem’s health condition above the“average”level, and could satisfy the water requirement of the majority of aquatic organisms. Besides, this method shows the difference between spawning season and non-spawning season, thus gives reference for the seasonal regulation of water resources in the basin.
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