Simulation and analysis of hydrological connectivity changes in the lower minjiang river basin from 2000 to 2020
[Objective]The Minjiang River is the largest river in Fujian Province,and its ecological environment and water sys-tem status directly affect the quality of the ecosystem and sustainable development of Fujian Province.The quantitative evaluation of the rapid urbanization development of Fuzhou City and its surrounding urban agglomeration,as well as the impact of artificial water system connectivity projects on the connectivity of the lower reaches of the Minjiang River,is of great significance for flood control and disaster reduction in the basin and the protection of the river ecological environment.[Methods]A quantitative simu-lation assessment of water system connectivity in the lower Minjiang River basin from 2000 to 2020 was conducted.This assess-ment was based on Landsat 7 data and land use from different periods,and circuit theory method were employed.[Results]It was found that significant changes in land use had been experienced by the lower Minjiang River basin over the past 20 years,with urban land area being increased by 91.1%.Lower water connectivity in urban areas such as the main city district of Fuzhou was revealed by the simulation of cumulative current values,primarily attributed to changes in landscape patterns caused by rapid urbanization and land use type conversion,which result ed in a 37.2%reduction in water system connectivity in the region.The decline in water connectivity was slowed by measures such as comprehensive water management projects that were initiated after 2015,with a 2.4%reduction in the area prone to flooding in the lower reaches of the Minjiang River from 2015 to 2020 compared to 2000-2005 being observed.[Conclusion]The suitability and significance of the circuit theory model for simulating water sys-tem connectivity and analyzing flood capacity in urban river networks were demonstrated by the introduction of this model.The flow and self-purification capacity of water bodies in the lower Minjiang River had been enhanced by Fuzhou City through river management,optimization of urban spatial layout,and watershed ecological protection and restoration.These measures were found to have mitigated the negative impacts of urbanization on water system connectivity and to have strengthened the basin′s ability to withstand hydrological disasters.The research result can provide case references for disaster prevention and mitigation in rapidly urbanizing watersheds.
water system connectivitycircuit theoryMinjiang RiverFuzhou Cityurbanizationhuman activitiesrunoffland use
万方数据
