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| Field rainfall experiment on the unpaved roads during the Shenfu-Dongsheng coalfield exploitation |
| LI Hong-Wei1, LIU Min2, DAN Song1, WANG Zhen3, WANG Wen-Long1, 4 |
| (1. College of Resources and Environment, Northwest A&F University, 712100, Yangling, Shaanxi; 2. Yangling Water Authority and Water Conservation Station, 712100, Yangling, Shaanxi; 3. Hydrochina Huadong Engineering Corporation, 310014, Hangzhou; 4. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, 712100, Yangling, Shaanxi: China) |
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Abstract Shenfu-Dongsheng coalfield is one of the seven largest deposites of coal had known in the world. However, severe soil and water erosion occurred on the mining wastes in the areas, especially on the unpaved roads. A field rainfall experiment on soil erosion and sediment yield on unpaved roads was conducted to provide scientific data for predicting and controlling soil and water loss on unpaved roads. Results indicated that the variation process of sediment yield appeared in three types, which were smooth, multimodal and unmoral distribution. The erosion sediment and transport rate were affected largely by rainfall intensity, and its process can be divided into rapid growth phase, fluctuating phase and stable phase. The runoff generation time on unpaved roads decreased with the power function with the increase of rainfall intensity, and occurred parabola shape of first increase then decrease with the increase of slope. Runoff rate increased with the increase of rainfall intensity, and the fitted formulas was r =2.596I-0.431. Sediment transport rate and runoff rate decreased with the exponential function, and the formulas was Ms = 0.223 9W1.946 2. The objective of this study was to provide theoretical foundation for research and predication in the soil and water loss of mining area.
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Received: 22 February 2012
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