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RELATIONSHIP OF RUNOFF AND SEDIMENT PRODUCTION BETWEEN HILLSLOPE AND GULLY SLOPE IN A SMALL BASIN IN THE HILLY LOESS REGION, NORTH CHINA

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Watershed Management to Meet Water Quality Standards and Emerging TMDL (Total Maximum Daily Load) Proceedings of the Third Conference 5-9 March 2005 (Atlanta, Georgia USA) Publication Date 5 March 2005  701P0105.(doi:10.13031/2013.18122)
Authors:   CAI Qiangguo

In the hilly loess region, due to variation in geo-morphological characteristics and to a lesser extent differences in soil characteristics, the relative significance of erosion processes and sub-processes varies with slope zone (upper hillslope, middle hillslope, lower hillslope, gully slope). Thus empirical relations established as well as parameters selected in these relations vary with slope zone. These spatial variations of runoff, soil erosion and sediment production are shown by actually monitored runoff and soil loss data, as well as runoff-soil loss relations. Furthermore, there is significant spatial interaction of processes. It is clear that while gully slopes contribute a large proportion of total basin sediment load, a significant part of the sediment contribution is induces by the upslope input of runoff. Data available show that If appropriate soil conservation measures are established to prevent the input of runoff, then the contribution of runoff an d sediment by gully slope will be reduced by 29% and 64% respectively during an average storm, and by 61% and 84% respectively during the maximum storm.

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