生物对河流流量的适宜性

The suitability degree of the aquatic organisms to river flow

从流量、频率、历时、发生时间、变化率5个方面选取水文指标,将描述生态流量的多个特征量转化成一个单一的综合指标,利用综合指标值描述生物对河流流量适宜性程度,并对长江中下游宜昌、汉口、大通水文控制站近50a来中华鲟、四大家鱼对河流流量适宜性程度进行了验证分析。结果表明,以综合指标的方法反映了生物对河流流量适宜性程度是可行的,体现了河流流量偏离河流适宜生态流量过程的程度,这对于保证满足水生生物正常生活规律所需要的河道内流量过程具有重要的参考意义。

Hydrological indicators with ecological meaning including flow,frequency,timing,duration,rate of change are selected to do the analysis.The approach is that,simplifying multi-characteristic values into a single integrated indicator,which describing the suitability degree of the aquatic organisms to the river flow.As a case study,flow data in the recent 50 years at Yichang,Hankou and Datong hydrological stations in the middle and lower reach of Yangtze River are selected to analyze the suitability degree of Chinese Sturgeon and Four Major Chinese Carps to the flow of Yangtze River.The results show that,it′s feasible to choose the integrated indicator to reflect the suitability degree of the aquatic organisms to river flow,which indicates the deviation degree of the river flow from the suitable ecological flow.It is significantly important to guarantee the suitable river flow process for the normal life of organisms in the river.