Author(s): Jiayao Zhuang; Nakamura Hiroyuki; Jinchi Zhang; Peng Cheng; Jun Fu
Linked Author(s):
Keywords: GIS; Water discharge; Sediment discharge; Specific discharge; Land use
Abstract: Hydrological observation was carried out at the catchments of four kinds of land use, namely cultivated land, pine forest, Chinese fir forest and tea garden in the Shangshe catchment of the Dabie Mountains, where the kinds of land use is mainly divided into the four kinds mentioned above. Every catchment has a weir at the outlet to measure water discharge by a float-type water gauge. At the same time, sediment discharge was also observed at interval of 10 min. During the study period (1999 and 2000), 80 rainfall events happened, among which, 46 events produced runoff. A comparision of comparing the hydrograph of specific discharge and specific sediment discharge on June 22,2000 showed that the cultivated land produced the highest peak specific discharge and peak sediment discharge among the five monitored sites, which was 20m 3 ·km -2 ·s -1 and 1,350 kg·km -2 ·s -1 respectively. Integrating the hydrograph of specific discharge of various land use with geographic information systems (GIS) and hydro model, a new formula is developed to establish an explicit linkage between the water discharge at the river outlet and the spatial distribution and rates of process within the catchment. Similarly, integrating the hydrograph of specific sediment discharge of various land use with geographic information systems (GIS) and hydro model, a new formula is developed from a unit hydrograph method, which aimed to establish an explicit linkage between the sediment discharge at the river outlet and the spatial distribution and rates of process within the catchment. The results of the models on June 22,2000 showed that the process of water and sediment discharge were well simulated from the observed results of the four monitored sites of different land use integrated with GIS.
Year: 2004