Study of Regional Evapotranspiration Based on MODCYCLE Model

Efficient and accurate estimation of evapotranspiration (ET) not only has significant implications for research in land-atmosphere interactions and climate change, but also has important application values in regional water resources management. In this paper, a distributed hydrology mode - MODCYCLE model is applied to study regional ET in Tianjin. MODCYCLE model is based on the dual water cycle theory and is recently developed by the Department of Water Resources, China Institute of Water Resources and Hydropower Research (IWHR). The MODCYCLE model was implemented in Tianjin with a set of data, including daily meteorological and hydrological data, annual water usage from 1997 to 2004, and other spatial information, such as remote sensing imagery, DEM (90 m), the digital channel system map, the land use map, and the soil type map. The model was calibrated to match the ET derived from remote sensing data. The modelled monthly ET was compared with the monthly remote sensing ET and the correlation coefficien...