水文情势变化对岩溶区流域河流生态的影响

Influence of Hydrologic Alteration on River Ecology in Karst Region

采用IHA/RVA法和EFC指标分别分析澄碧河坝首站和平塘站的水文情势改变程度,并利用滑动平均法分析特殊水文指标的趋势。研究表明,澄碧河水文情势改变了河流生态,其中澄碧河坝首站、平塘站的水文综合改变度分别为46.04%、66.91%,均属中度改变;EFC的组成较变异前更为丰富;变异后,澄碧河坝首站、平塘站的1日最小流量分别以平均每年0.07m3/s的速率缓慢上升和平均每年0.01m3/s的速率缓慢下降。受水文情势和岩溶区的影响,上游平塘站对河流生态产生不利影响,下游坝首站更利于澄碧河枯水期河流生态的发展。研究结果为未来澄碧河实施生态监管提供了依据,建议加强监测和分析岩溶区流域水文气象要素,以保证河流生态健康安全。

IHA/RVA method and EFC index were respectively used to evaluate the hydrologic alteration of Bashou hydrological station and Pingtang hydrological station in Chengbihe River.The trend of special hydrological indicators was analyzed by moving average method.This study shows that the hydrologic alteration affects the ecology in Chengbihe River,hydrologic comprehensive alteration of Bashou hydrological station and Pingtang hydrological station are respectively 46.04%and 66.91%,and it belongs to the middle category;The composition of EFC is more abundant than before;After hydrologic alteration,one day minimum flow of Bashou hydrological station rises slowly at an average annual rate of 0.07 m^3/s,while Pingtang hydrological station decreases slowly at an average annual rate of 0.01 m^3/s.Affected by the hydrologic alteration and Karst area,Pingtang hydrological station has a negative impact on river ecology,and Bashou hydrological is more conducive to the development of river ecology in the dry season of Chengbihe River.This study intends to provide a basis for ecological supervision of Chengbihe River in the future,and it suggests strengthening the monitoring and analysis of the hydrological and meteorological elements in the Karst region so as to ensure the ecological health and safety in river.