生态补水背景下融合SWOT等多源数据的北京潮白河地表水-地下水-地表形变的时空效应分析OACHSSCD

Against the new water regime,identifying the response characteristics of the surface water-groundwater-surface deformation system to the combined effects of climatic and hydrological processes and anthropogenic ecological water replenishment,using new multi-source remote-sensing observations,is important for improving our understanding of regional hydrological processes and optimizing water-resources regulation.Here,the Shunyi reach of the Chaobai River was selected as a case study.By integrating SWOT satellite,InSAR,in situ groundwater levels,and satellite-based meteorological and hydrological data,we established a coordinated analysis framework for surface water-groundwater-surface deformation-identified their spatiotemporal responses.The main results are as follows.SWOT effectively captured reach-scale water-level variations in both open reservoirs and narrow river channels.The water surface elevation of the Chaobai River showed pronounced longitudinal differentiation,increasing in the upper reach,remaining relatively stable in the middle reach,and declining overall in the lower reach.Land deformation in the study area was dominated by a near-stable mode,while persistent subsidence,transitional evolution,and persistent uplift also occurred,forming a spatial pattern in which stability,subsidence,and uplift coexisted.Climatic water balance affected soil moisture,reservoir water levels,and river water levels at different timescales.The influence of surface water on groundwater exhibited clear reach dependence and aquifer contrasts:unconfined groundwater near the river responded more strongly,whereas confined groundwater showed no clear distance effect.The correlation between groundwater levels and InSAR-derived cumulative displacement was strongly heterogeneous in space,and the resulting deformation response was jointly controlled by aquifer structure,historical compaction,and delayed consolidation.The integration of multi-source remote sensing and ground observations effectively revealed reach-specific,aquifer-specific,and deformation-mode-specific responses within the surface water-groundwater-surface deformation deformation system under dual water cycle regulation.These findings provide a reference for evaluating ecological water replenishment,monitoring groundwater recovery,and mitigating land subsidence risk.