Effect of vegetation change on hydrologic cycle in Changjiang and Yellow River catchments

HR: 11:50h
AN: H52B-07 [Abstracts]
TI: Effect of vegetation change on hydrologic cycle in Changjiang and Yellow River catchments
AU: * Nakayama, T
EM: nakat@nies.go.jp
AF: National Institute for Environmental Studies (NIES), 16-2 Onogawa, Tsukuba, 305-8506, Japan
AU: Watanabe, M
AF: Keio University, 5522 Endo, Fujisawa, 252-8520, Japan
AB: In China, the climate and water budgets are very different between the northern and southern regions. In the semi-arid regions, such as Liaohe, Haihe, Ruanhe, and Yellow River catchments in north China, the runoffs are small or even zero during dry season (May - October) and are very sensitive to temperature increase and rainfall decrease. In the humid south regions like Changjiang River catchment, the runoffs are perennial and the base flow normally occupies a large portion of the total runoff volume, which often causes severe floods in the middle and lower regions. China is now to accelerate preparatory work on its ambitious project for driving water from the Changjiang River to the Yellow River catchments, so-called, the South-to-North Water Transfer Project. The chief objective of this project is to remedy the basic mismatch of China’s land and water resources. The new researches has begun about the optimum amount of water that can be transferred, the environmental consequences of the scheme for the Changjiang River, the overall economic and social consequences of the project and various individual technologies, including the development of large pumps. We applied the NIES Integrated Catchment-based Eco-hydrology (NICE) model (Nakayama and Watanabe, 2004, 2006; Nakayama et al., 2006, 2007) to the Changjiang and Yellow River catchments in order to simulate the relationship between the vegetation change and hydrologic cycle. We simulated the water/heat dynamics in the entire catchment with a resolution of 10 km mesh by using the NICE. The model reproduced excellently the river discharge, soil moisture, evapotranspiration, groundwater level, crop water use, crop productivity, et al. Furthermore, we evaluated the effect of irrigation in main crops such as rice, wheat, and maize on the water/heat budgets by comparing between both catchments. References Nakayama, T., and Watanabe, M., Water Resour. Res., 40(8), W08402, doi: 10.1029/2004WR003174, 2004. Nakayama, T., and Watanabe, M., Hydrol. Earth Syst. Sc. Discuss., 3, 2101-2144, 2006. Nakayama, T., et al., Hydrol. Process., 20(16), 3441-3466, doi: 10.1002/hyp.6142, 2006. Nakayama, T., et al., Sci. Total Environ., 373(1), 270-288, doi: 10.1016/j.scitotenv.2006.11.033, 2007.
DE: 1632 Land cover change
DE: 1655 Water cycles (1836)
DE: 1719 Hydrology
DE: 1813 Eco-hydrology
DE: 1836 Hydrological cycles and budgets (1218, 1655)
SC: Hydrology [H]
MN: 2007 Joint Assembly