JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI ›› 2018, Vol. 35 ›› Issue (7): 51-56.DOI: 10.11988/ckyyb.20170089

• WATERSOIL CONSERVATION AND ECOCONSTRUCTION • Previous Articles     Next Articles

Quantitative Monitoring of Soil Erosion Loss in Nanjing by RS, GPS, and GIS

LIANG Wen-guang1, QIAN Jun2, GAO Shi-pei2, WANG Dong-mei1, XU Shan-shan3, YANG Yin1, WANG Yi-hong1, KUANG Man-man1   

  1. 1.Lake Research Department, Hydraulic Research Institute of Jiangsu Province, Nanjing 210017, China;
    2.Administration Office, Hydraulic Research Institute of Jiangsu Province, Nanjing 210017, China;
    3.Department of Agricultural Water Conservancy, Nanjing Water Conservancy Bureau, Nanjing 210008, China
  • Received:2017-01-23 Online:2018-07-01 Published:2018-07-12

Abstract: A set of novel methods quantitatively monitoring soil erosion loss is employed to calculate the soil erosion loss in Nanjing City in 2011-2015 according to data of rainfall, land use, soil and terrain, and environmental satellite. Results revealed that: (1) From 2011 to 2015, the average total amount of soil erosion loss in Nanjing is 2.014 2 million tons, among which above light level (above level II) soil erosion is 1.667 7 million tons, occupying an area of 515.75 km2 and accounting for 82.8% of the total amount; soil erosion above level II remains a focus of control work. (2) With rainfall erosivity Ri as a decisive factor, the most severe soil erosion happened in 2015, while the slightest in 2013. (3) The five-year average amount of extremely severe (level VI) and severe (level V) soil erosion ranks top among the grading. (4) Compared with ten-year average in 2001-2010, the area of slight (level I) soil erosion in 2011-2015 increased by 7.6%, while the area of erosion above level II reduced by 42.5%, with the amount cut by 23.7%; the decrease in CP(vegetation cover and preservation measure) is the main cause of such mitigation in 2011-2015. (5) In 2011-2015, the decrease in area and amount of level IV and V alleviated; while the area and amount of level VI exacerbated due to large value of rainfall erosivity Ri (five-year average in 2011-2015). The research achievements offer important fundamental data support and scientific basis for the soil and water conservancy planning and soil erosion control in Nanjing City.

Key words: soil erosion loss, Nanjing City, 3S technology, quantitative monitoring, rainfall erosion

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