Response to hydrometeorological changes and evaluation of habitat quality in the Dongting Lake basin, China

With the advancement of hydraulic engineering processes, surface water resources are encountering unprecedented crises and further threatening social and ecological sustainability. This study analyzed the response changes and potential correlations between river conditions and climate change in the Dongting Lake (DTL) basin using gray correlation analysis and the LSTM model. Additionally, the InVEST model was employed to further assess the distribution of habitat quality within the basin. The results of the study showed that (1) the range of variation of environmental flows in each tributary became significantly narrower and the frequency of extreme hydrological conditions was reduced in the period after the abrupt hydrological change. (2) The hydrological status had a higher degree of correlation with the rainfall index, and the performance is more prominent on the Xiang River, and the influence of temperature is less. (3) Except the Xiang River Basin, human activities are the dominant factor of runoff variation, and the annual contribution is generally higher than 50%. (4) Habitat quality in the 'high' distribution was the most guarded and always accounted for more than 60% of the basin, while habitat quality in the east-central part of the DTL basin and around the DTL was generally low. HIGHLIGHTS center dot Potential linkages between climate change and hydrological regimes. center dot Differences in response to climate change between multiple tributaries and confluences in the basin. center dot Habitat impacts of changes in climate and hydrological regimes.