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RESPONSE OF SEDIMENT DISCHARGE TO ECOHYDROLOGICAL FACTORS IN luergoU catchment BASED ON WAVELET ANALYSIS

International Journal of Sediment Research 2007年第1期22卷 70-77页

作者： Yuan TIAN1, Xinxiao YU2, Derong SU3, and Xin YANG4 1 Prof., 4 Dr., College of Chemical and Environmental Engineering, Beijing Technology and Business University, Beijing, 100037, 2 Prof., 3 Dr., The Key laboratory of Soil & Water Conservation of Ministry of Education, Beijing Forestry University, Beijing, 100083 3 The Key laboratory of Silviculture & Conservation of Ministry of Education, Beijing Forestry University, Beijing, 100083 Beijing Technol & Business Univ Coll Chem & Environm Engn Beijing 100037 Peoples R China Beijing Forestry Univ Key Lab Soil & Water Conservat Minist Educ Beijing 100083 Peoples R China Beijing Forestry Univ Key Lab Silviculture & Conservat Minist Educ Beijing 100083 Peoples R China

The response of sediment discharge rate to the following four ecohydrological factors: temperature, rainfall, evapotranspiration (ET), and stream flow was evaluated by conducting wavelet analysis on luergou small catchment data ranging from 1982 to 2000. For sediment discharge rate, there was an overall trend of reduction that included a periodic oscillation of 6 to 7 years per cycle. Rainfall also had an overall trend of reduction that included two periodic oscillations of 7 years per cycle and 2 years per cycle, respectively. Stream flow had the same trend as rainfall but had one periodic oscillation of 6 to 7 years per cycle. In contrast with rainfall and stream flow, the trends for temperature and ET each showed an overall increasing tendency, and both had the same two periodic oscillations of 6 to 7 years per cycle and 4 years per cycle, respectively. The sediment discharge rate had significant relationships with the four ecohydrological factors, with stream flow and rainfall having positive correlations, while ET and temperature had negative correlations. The correlation between ET and sediment discharge rate became stronger when ET was compared to the sediment discharge rate of the following year. The relationship between sediment discharge rate and the four ecohydrological factors was further expressed by the multi-linear regression model that was constructed, which makes sediment discharge rate a function of stream flow, rainfall, ET, and temperature.

关键词： Sediment discharge rate Rainfall Stream flow Wavelet analysis luergo small catchment

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