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[1]ZHANG Jinhuang,LIU Danqiang,JIANG Xiaosan,et al.Study on Soil Erosion Monitoring of Xihe Small Watershed in Danjiangkou Reservoir Based on the Technique of Quantitative Remote Sensing[J].Research of Soil and Water Conservation,2015,22(03):67-72.

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Study on Soil Erosion Monitoring of Xihe Small Watershed in Danjiangkou Reservoir Based on the Technique of Quantitative Remote Sensing

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 22 Number of periods: 2015 03 Page number: 67-72 Column: Public date: 2015-06-28

Title:: Study on Soil Erosion Monitoring of Xihe Small Watershed in Danjiangkou Reservoir Based on the Technique of Quantitative Remote Sensing

Author(s):: ZHANG Jinhuang¹, LIU Danqiang², JIANG Xiaosan³, BIAN Xinmin¹; 1. College of Agronomy, Nanjing Agricultural University, Nanjing 210095, China;
2. Water Management Bureau of Shangnan County, Shangnan, Shaanxi 726300, China;
3. Center of Resources and Environment Information Engineering, Nanjing Agricultural University, Nanjing 210095, China

Keywords:: soil and water loss; quantitative remote sensing; monitoring; Xihe small watershed

CLC:: S127

DOI:: -

Abstract:: In this study, quantitative monitoring of soil erosion model QRSM developed by Bu Zhaohong of Nanjing Institute of Soil Science was used to precisely calculate the values of each factor of soil erosion of each monitoring pixel in Xihe small watershed of Danjiangkou reservoir on the upper reaches of Yangtze River through the support of 3S technologies, the high-resolution 1∶10 000 topographic maps and ALOS remote sensing data. The study addressed the error and adjusted the parameters about calculation each factor of the model, and compared precision of values of R of two different algorithms of the results between PI algorithms of QRSM model rainfall forecast and EI classical algorithms of USLE model. The results showed that forecast accuracy was 86.2% of PI algorithm of the rainfall. The results also showed that the area of soil erosion in Xihe small watershed was 1 901.00 km², accounting for 48.4% of the total area, the mild erosion area was 685.64 hm², moderate loss area was 253.86 hm², severe loss area was 428.16 hm², intensely severe loss area was 450.04 hm², severe loss extremely area was 83.30 hm², accounting for 36.1% 13.4%, 22.5%, 23.7%, 4.3% of the total area of the valley, respectively. The total amount of soil erosion in the watershed was 10 350 t, erosion modulus was 2 633 t/(km²·a). It was the moderate erosion area. The northern area of the watershed is the control part and the southern area is the comparison part, the soil erosion area of northern control part reduced to less than 15%. Macaogou watershed with severe soil erosion was selected as the case, the soil erosion prediction accuracy of this model was up to 89.6% with respect to the comparison of the data of soil erosion sediment obtained from the monitoring model and the measured data in this watershed. The monitoring model will be extended and applied to the upper reaches of the Yangtze River. It has a forward-looking in terms of soil erosion monitoring and forecast in the upper reaches of the Yangtze River, and has certain theoretical reference and practical demonstration and promotion of technical support and other value for the other small watersheds.

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