Journal of the Japan Society of Erosion Control Engineering,
Vol.57,No.3,,2004
GIS-based semi-distributed sediment discharge model with a focus
on the influence of land use in the Shangshe catchment
Zhuang Jiayao*1, Nakamura Hiroyuki*1, Zhang Jingchi*2,
Shiraki Katsushige*1, Chengpeng*3, Fujun*3
Abstract
Sediment management strategies are crucial to developing countries because of the limited available resources. Establishment of these strategies is hampered to some extent by the lack of reliable information on catchment sources. This paper reports the rainfall-sediment response of various types of land in the Shangshe catchment (528.8ha) of the Dabie Mountains of Anhui Province, China. Field observation in the year 2000 showed 32 rainfall events happened, among which 18 events produced runoff. Comparison among SISSD hydrographs from the five monitored sites showed that the cultivated land produced the highest level of SISSD, which was 100 times higher than those of the tea garden, the Chinese fir forest, or the pine forest and 10 times higher than that of the river outlet of the Shangshe catchment. Integrating the field observation data of SISSD in representative kinds of land use within the catchment with Geographic Information Systems (GIS) and a hydro model, the GOIUH model was constructed to simulate the SISSD hydrograph of the river outlet. The resulting model showed that the calculated SISSD hydrographs compared quite well with the observed ones at the river outlet of the Shangshe catchment, as shown by the coefficient of correlation R2 being equal to 0.8. The semi-distributed sediment discharge model with a focus on the influence of land use in the Shangshe catchment helps to quantitatively understand the source of sediment discharge.
Key words:Sediment discharge, Land use, GIS, Simulation.
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