Monitoring of soil erosion and assessment for contribution of sediments to rivers in a typical watershed of the Upper Yangtze River Basin

Fan, Jun; Zhang, J. H.; Zhong, Xin; Liu, S. Z.; Tao, Heping

doi:10.1002/ldr.622

Cited by 29 publications

(19 citation statements)

References 7 publications

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“…There are a variety of vegetation types in this area, which are dominated by alpine shrub, alpine meadow, farmland, and forest. This region belongs to the humid subtropics of south Asia, and the climate is mainly characterized by the southwest and southeast monsoons in wet season in addition to prevailing wind from the west in cold season (Fan et al 2004;Shen et al 2013;Zhuang and Ge 2012). Mean annual precipitation is 893 mm, and the rainy season occurs between May and October, accounting for 88.1 % of annual precipitation.…”

Section: Study Areamentioning

confidence: 99%

Estimation of soil erosion in some sections of Lower Jinsha River based on RUSLE

et al. 2015

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Soil erosion increasingly poses a great threat to human food security and environmental quality. It is necessary to implement the assessment of soil erosion so as to provide precautionary measures and relevant suggestions for soil conservation. In this paper, the soil erosion model, revised universal soil loss equation (RUSLE), was used to quantify the soil loss in a large mountainous area of Lower Jinsha River Basin. The analysis of the datasets by means of geographic information systems (GIS) together with RUSLE led to the estimation of soil erosion. Results show that the average annual soil erosion was estimated at 52.1 t ha -1 year -1 and the total annual soil loss was 4.5 9 10 8 t. The highest erosion was found along the main course of Jinsha River. Soil erosion was serious in the elevation zone between 1,675 and 2,153 m and slope zone with slopes between 15°and 35°. As for land use types, cropland and grassland contributed 84.1 % to total soil loss due to the large areas and higher erosion rates. The results can be used to advice the local government in prioritizing the areas of immediate conservation practices.

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Section: Study Areamentioning

confidence: 99%

Estimation of soil erosion in some sections of Lower Jinsha River based on RUSLE

et al. 2015

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“…area, and the soil erosion amount reached 3Á21 Â 10 6 t y À1 in the Jialing River Basin in the mid-1980s (Fan et al, 2004). As an area with poor agricultural conditions and a degraded environment, it was considered a priority area for soil conservation in China in 1987 (Fan et al, 2004).…”

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confidence: 99%

“…As an area with poor agricultural conditions and a degraded environment, it was considered a priority area for soil conservation in China in 1987 (Fan et al, 2004).…”

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confidence: 99%

“…Therefore, as a typical agricultural county with severe soil erosion in the middle reaches of the Jialing River Basin, the Zhongjiang County was chosen as a case study. In this study, we used mapped data of local governments in a GIS-based spatially explicit analysis (Fan et al, 2004). The objectives of this study were: (1) to analyse the relationship between land use and soil erosion; and (2) to carry out integrated socio-economic assessment on the feasibility of improving sloping farmland, so as to provide a preliminary basis for establishing soil erosion prevention and control measures tailored to the different socio-economic conditions in this critical region.…”

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Land use and soil erosion in the upper reaches of the Yangtze River: some socio‐economic considerations on China's Grain‐for‐Green Programme

et al. 2006

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Soil erosion in the upper reaches of the Yangtze River in China is a major concern and the Central Government has initiated the Grain-for-Green Programme to convert farmland to forests and grassland to improve the environment. This paper analyses the relationship between land use and soil erosion in Zhongjiang, a typical agricultural county of Sichuan Province located in areas with severe soil erosion in the upper reaches of the Yangtze River. In our analysis, we use the ArcGIS spatial analysis module with detailed land-use data as well as data on slope conditions and soil erosion. Our research shows that the most serious soil erosion is occurring on agricultural land with a slope of 10 $ 25 degrees. Both farmland and permanent crops are affected by soil erosion, with almost the same percentage of soil erosion for corresponding slope conditions. Farmland with soil erosion accounts for 86Á2 per cent of the total eroded agricultural land. In the farmland with soil erosion, 22Á5 per cent have a slope of < 5 degrees, 20Á3 per cent have a slope of 5 $ 10 degrees, and 57Á1 per cent have a slope of > 10 degrees. On gentle slopes with less than 5 degrees inclination, some 6 per cent of the farmland had strong (5000 $ 8000 t km À2 y À1) or very strong (8000 $ 15000 t km À2 y À1) erosion. However, on steep slopes of more than 25 degrees, strong or very strong erosion was reported for more than 42 per cent of the farmland. These numbers explain why the task of soil and water conservation should be focused on the prevention of soil erosion on farmland with steep or very steep slopes. A Feasibility Index is developed and integrated socio-economic assessment on the feasibility of improving sloping farmland in 56 townships and towns is carried out. Finally, to ensure the success of the Grain-for-Green Programme, countermeasures to improve sloping farmland and control soil erosion are proposed according to the values of the Feasibility Index in the townships and towns. These include: (1) to terrace sloping farmland on a large scale and to convert farmland with a slope of over 25 degrees to forests or grassland; (2) to develop ecological agriculture combined with improving the sloping farmland and constructing prime farmland and to pay more attention to improving the technology for irrigation and cultivation techniques; and (3) to carry out soil conservation on steep-sloping farmland using suggested techniques. In addition, improving ecosystems and the inhabited environment through yard and garden construction for households is also an effective way to prevent soil erosion.

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“…Runoff and soil erosion from the catchment result from the complex interrelationships among climate, drainage area, land use and land cover (LULC), and human activities (Fan et al 2004;Walling 2006;Roosmalen et al 2009). Soil erosion process neither takes place from every part of the catchment nor is equally distributed because of varying differences of natural and man-made conditions.…”

Section: Introductionmentioning

confidence: 99%

Identification and management of critical erosion watersheds for improving reservoir life using hydrological modeling

Kumar

Raghuwanshi

Mishra

2015

Sustain. Water Resour. Manag.

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Sustainable management of water resources requires identification and management of critical erosion areas for reducing the reservoir sedimentation. A processbased distributed model SWAT (Soil and Water Assessment Tool) was used to identify critical erosion watersheds in Damodar catchment and tested soil and water management strategy to reduce sediment transport to reservoirs for improving their useful life. The model was calibrated and validated using measured runoff and sediment yield from two watersheds and two reservoir inflows. The validated model was also tested for its appropriateness by comparing the identified critical erosion area of the catchment with the erosion map prepared by Soil Conservation Department (SCD), Damodar Valley Corporation (DVC). The results show that the critical erosion area identified using modeling results matched spatially well with the DVC manually prepared area. Further, the validated model has been used to simulate the sedimentation in the reservoirs. The simulated sedimentation rate is 1.12 and 3.65 Mm 3 /year, respectively, for Konar and Panchet reservoirs for the studied period (1997)(1998)(1999)(2000)(2001), which is reduced to 0.98 and 1.80 Mm 3 /year, respectively, when the critical watersheds are treated with conservation measures. As a result of model identified and implemented management strategy, Konar and Panchet reservoirs will have an additional useful life of 8 and 85 years, respectively. Results show a successful incorporation of distributed hydrological modeling for identifying critical watersheds, developing effective management strategy for controlling soil erosion, reducing reservoir sedimentation and improving their useful life.

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Monitoring of soil erosion and assessment for contribution of sediments to rivers in a typical watershed of the Upper Yangtze River Basin

Cited by 29 publications

References 7 publications

Estimation of soil erosion in some sections of Lower Jinsha River based on RUSLE

Estimation of soil erosion in some sections of Lower Jinsha River based on RUSLE

Land use and soil erosion in the upper reaches of the Yangtze River: some socio‐economic considerations on China's Grain‐for‐Green Programme

Identification and management of critical erosion watersheds for improving reservoir life using hydrological modeling

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