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Volume 33 Issue 2
Jun.  2014
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Article Navigation >  CARSOLOGICA SINICA  > 2014  >  33(2): 201-207
LONG Ming-zhong, WU Ke-hua, XIONG Kang-ning. Assessment of the applicability of the WEPP model (Hillslope Version) for soil erosion in karst rock desertification area, Guizhou Province[J]. CARSOLOGICA SINICA, 2014, 33(2): 201-207.
Citation: LONG Ming-zhong, WU Ke-hua, XIONG Kang-ning. Assessment of the applicability of the WEPP model (Hillslope Version) for soil erosion in karst rock desertification area, Guizhou Province[J]. CARSOLOGICA SINICA, 2014, 33(2): 201-207.
shu

Assessment of the applicability of the WEPP model (Hillslope Version) for soil erosion in karst rock desertification area, Guizhou Province

  • 1.

    School of Geographic and Oceanographic Science, Nanjing University；Research Center for Karst Wetland Ecosystem, Guizhou Minzu University

  • 2.

    Institute of Mountain Resources, Guizhou Academy

  • 3.

    Institute of South China Karst, Guizhou Normal University

  • Received Date: 2013-11-06
  • Publish Date: 2014-06-25
    Abstract
  • The Huajiang demonstration area (total area = 47.63 km2) in Guizhou Province was used as a study area to assess the applicability of the WEPP (Hillslope Version) model for soil erosion in karst rock desertification areas. The Huajiang demonstration area, which features typical-canyon in karst plateau, covers both sides of Huajiang river between Guanling county and Zhenfeng county in southwest Guizhou. The demonstration area is in the Panjiang syncline composed of Upper and Middle Triassic carbonates, with lime soil. The soil erosion area is 23.62 km2, that is 49.6 % of the total area, indicating that the soil erosion is serious. Using the runoff plot method and the erosion pin technique, the author monitored and simulated soil loss in the demonstration area in 2006 and 2010 using the WEPP model (Hillslope Version). The applicability of the WEPP model to karst rock desertification areas was assessed by comparing monitoring and simulating data, and the Nash-Sutcliffe coefficient was calculated. The simulation results showed relatively large error and the effective coefficients were negative indicating that the WEPP model is not applicable for direct calculation of the soil erosion modulus in the karst areas of Guizhou. Although the simulation accuracy for soil erosion on micro scale is not sufficient, it generally reflects the different soil erosion intensities between different runoff plots and the relationship between the process of ecological restoration and the changing trend of soil erosion. The application of the WEPP model to soil erosion calculation in karst areas must take into account environmental factors such as underground leakage, rate of bedrock outcropping, and highly broken terrain.

     

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