三峡库区喀斯特洼地小流域产沙强度WaTEM/SEDEM模拟——以巫山县常家洼洼地流域为例

doi:10.16843/j.sswc.2021.02.012

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Abstract [Background] In karst area, the soil formation rate is low, and soil layer is thin and shows great spatial heterogeneity. The Three Gorges Reservoir region is the ecological security barrier in the middle and upper reaches of the Yangtze River. Karst landscape is wide in this region. In general, the karst land has complex terrain, and is subjected to intensive human disturbance and increasing rocky desertification. Reliable data of specific sediment yield (SSY) from small catchment is essential to our understanding of the process of rocky desertification. [Methods] The WaTEM/SEDEM was used to analyze the effects of multiple factors on soil erosion, to simulate the interception of sediment by water bodies such as reservoirs, ponds, dams and river sections in the southwest karst area. The WaTEM/SEDEM model was used to assess the SSY of Changjiawa catchment, a typical karst depression catchment in the Three Gorges Reservoir region. The SSY was determined by ¹³⁷Cs dating to calibrate the model parameters and verified by the reported data of SSY from karst catchment. [Results] 1) The sedimentation rate in the Changjiawa depression was 0.27 cm/a, and the SSY was 155 t/(km²·a). The simulation results were corrected using the SSY determined by ¹³⁷Cs dating in the depression, and the optimal combination of the minimum and maximum K_TC values of WaTEM/SEDEM were 18 and 7, with the highest c_NS (Nash-Sutcliffe coefficient) of 0.79, it showed that the model simulation effect was the best. 2) Using the WaTEM/SEDEM model, the total sediment deposition and SSY of Changjiawa small catchment since 1963 were 557 t and 122.91 t/(km²·a), which was higher than that in most karst catchments, which was mainly related to the lithology of the basin and the intense human activities. 3) WaTEM/SEDEM model simulation results were verified by published erosion and sediment modulus data. The correlation coefficients of the simulation results of SSY and sediment yield (SY) were 0.93 and 0.94, implying the simulated data reflected the actual erosion and sediment modulus situation in this area, and ¹³⁷Cs data had good correction effect on WaTEM/SEDEM model parameters. [Conclusions] The combination of nuclear tracer dating technology and the WaTEM/SEDEM model may produce reliable SSY from small catchment of peak cluster depression, which is useful in karst areas lacking monitoring data. In the future, the WaTEM/SEDEM model may be used to assess sediment yield at the scale of depression catchment in this region.

Key words： rocky desertification karst depression sediment yield WaTEM/SEDEM model ¹³⁷Cs dating

Received: 20 November 2019

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S157.1

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	Articles by authors
	LU Xue
	ZHANG Yunqi
	LONG Yi
	PEI Zengli
	WU Zhehong
	XU Mingyang
	ZHANG Decheng

Cite this article:

LU Xue,ZHANG Yunqi,LONG Yi, et al. Modeling sediment yield using WaTEM/SEDEM for a small catchment of karst depression in the Three Gorges Reservoir region: A case study of the Changjiawa depression catchment of Wushan county[J]. SSWC, 2021, 19(2): 92-97.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2021.02.012 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2021/V19/I2/92

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