Investigating the warming effect of urban expansion on lake surface water temperature in the Dianchi lake watershed

作者：Yi Luo, Linfeng Tang, Kun Yang, Xiaolu Zhou, Jing Liu, Yang Zhang, Zongqi Peng · 发表于：Journal of Hydrology Regional Studies · 年份：2023 · DOI：10.1016/j.ejrh.2023.101516 · 被引用次数：8 · 研究领域：Urban Heat Island Mitigation、Land Use and Ecosystem Services、Flood Risk Assessment and Management

Dianchi lake (DCL) watershed, located in southwestern China, has undergone significant urbanization. Due to the accelerating urbanization in the watershed, the influence of urban expansion on lake surface water temperature (LSWT) has become increasingly significant. However, there is currently no quantitative study on the specific warming value of LSWT caused by urban expansion. This study primarily quantifies the increase in LSWT caused by urban expansion from two perspectives: the rise in near-surface air temperature (NSAT) resulting from urban expansion and the thermal runoff generated by urban expansion. We found that the DCL watershed experienced significant urban expansion between 2001 and 2018. In this context, the cumulative increase in LSWT caused by the newly added impervious surface (IS) through NSAT is about 0.25 °C. The cumulative warming of the newly added IS on the LSWT through thermal runoff is about 0.05–0.06 °C. Urban expansion mainly affects the LSWT by increasing the NSAT.