Diagnosis of Basin Eco-Hydrological Variation Based on Index Sensitivity of Similar Years: A Case Study in the Hanjiang River Basin

The variation of hydrological conditions in the basin affects original stable state basin, and change eco-hydrological also plays a decisive role stability basin. In this manuscript, Indicators Hydrologic Alteration (IHA) was used to diagnose watershed from perspective, new diagnostic method proposed current study, which extraction most relevant indicators based on similar year sensitive index diagnosis period. This sensitivity statistical characteristics between years provide basis for selection ecologically-relevant hydrogeological (ERHIs), then selected strong indicators, finally variation. runoff data (1960 2020) Ankang gauging station Hanjiang River were analyzed, results showed that high average duration low discharge minimum one day year. period 1973 1986. It concluded perspective eco-hydrology consistent with actual situation changes, had certain reliability.