Abstracts for the 5th International GAME Conf.

3-5 October 2001

Aichi Trade Center

Nagoya Japan

Studies on Regional Water Cycle and Hydrologic Modeling in North China

Shourong Wang (1), Ronghui Huang (2), Yihui Ding (3), L. R. Leung (4), M. S. Wigmosta (4), L. W. Vail (4)

Due to natural variability and anthropogenic affections, climate in North China has been obviously changing for last 50 years. The mean annual temperature of the 1990¡¯s is 1.2¡æ higher than that of the 1950¡¯s, while precipitation decreases 40 mm in the same period. Climate change has significant impacts on water cycle and water resources in that region. Precipitation reduction attributes mainly to the diminishing input water vapor over this region. It is reported that natural runoff in Hai and Luan river basins has rapidly decreased with a rate of 23 percent/10 years for last 40 years. Unbalanced water resources has become the critical factor restricting social and economic development in North China. In order to assess the impacts of climate change on water resources in North China, a distributed hydrology model DHSVM is developed to nest with regional climate models, and the Luan River and Sanggan River basins are chosen for both atmospheric and hydrologic modeling and analyzing. The watershed model, DHSVM, provides an integrated representation of watershed process at the topographic scale described by digital elevation model (DEM) data. It includes a two-layer canopy model for evapotranspiration, an energy-balance model for snow accumulation and melt, a two-layer rooting zone model, and a saturated subsurface flow model. To apply DHSVM in China for the first time, some improvements, such as change of hydrology model structure, renovation of evapotranspiration model, development of new hydrology, vegetation and soil parameterization schemes, and the connection of DHSVM with regional climate models ( PNNL RCM and NCAR RegCM2), have been implemented. First, DHSVM is driven by observed datasets. The modeling efficiency values for Luan River and Sanggan River basins are 0.90 and 0.82, respectively. Then, DHSVM is nested with PNNL RCM and the modeling efficiency values of Luan River Basin and Sanggan River Basin in 1996 and 1997 are 0.62 and 0.69, respectively. And then, DHSVM is nested with NCAR RegCM2. According to the simulated results, under double CO2 scenarios, temperature in the two river basins will rise about 2.8¡æ and mean annual runoff values of Luan and Sanggan river basins will be 74mm and 71mm, respectively, which are approximately a quarter of mean annual runoff value (284mm) of whole China. The simulated results indicate the worm and dry trend will continue for the two river basins under double CO2 scenarios.

Submittal Information

Name : Date :
    Shourong Wang
    18-May-01-23:54:36
Organization : Theme :
    China National Climate Center, CMA
    Theme 2
Address : Presentation :
    46 South Zhongguancun Load
    Poster or oral
Country : Abstract ID :
    P.R.China
    T2SW18May01235436
Phone : Fax :
    86-10-62170353
    86-10-62176804
E-mail :
    wangsr@cma.gov.cn