Author(s): Haifan Liu; Mingfu Guan

Linked Author(s):

Keywords: Hydrological Processes; ISSHM; Land Use/Land Cover Change; Topography

Abstract: Land use/land cover change (LULCC) inevitably alters hydrological processes in a catchment. Catchment characteristics, including topography, are also crucial for predicting the impact of LULCC. However, studies examining the effects of LULCC and topography simultaneously and thoroughly across multiple catchments are limited. We applied an Integrated Surface-Subsurface Hydrological Model (ISSHM), the Simulator for Hydrologic Unstructured Domains (SHUD), in two subtropical basins within China’s Great Bay Area (GBA) to assess the influence of urbanization-induced LULCC and terrain slope on four key hydrological processes: surface runoff, subsurface flow, evapotranspiration (ET), and infiltration, on a daily scale. Our findings reveal that the correlation between slope and subsurface flow is greater in different zones of the basin. LULUC has a strong influence on infiltration. In gently sloping basins, LULCC affects subsurface flow over a wider range of areas, whereas in more steeply sloping basins, the range of areas affecting subsurface flow is smaller and concentrated near the foothills. These findings provide insights into the different responses of daily-scale hydrologic processes in various basins.

DOI: https://doi.org/10.3850/iahr-hic2483430201-155

Year: 2024