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| Runoff and sediment generation on disturbed land in the process of Shenfu coalfield construction |
| Huang Pengfei1, Liu Min2, Wang Wenlong1, 3, Luo Ting4 |
| 1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, 712100, Yangling, Shaanxi; 2.Yangling District Water Conservation Bureau, 712100, Yangling, Shaanxi; 3.Institute of Soil and Water Conservation, Northwest A&F University, 712100, Yangling, Shaanxi; 4.Hangzhou Earth Science and Technology Co. , LTD, 310000, Hangzhou:China) |
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Abstract To analyze the law of runoff and sentiment generation of the disturbed land in the process of coalfield construction, taking the disturbed land in Shenfu coalfield as study object, compared with undisturbed land, dynamic process of runoff and sediment generation were studied by runoff scouring experiments . The results show that: 1) The soil infiltration rate, sentiment yield and soil detachment rate increase with the flow discharge and the slope gradient; 2) Under different discharge rates ranging from 5 to 25 L/ min, the average soil infiltration rate (0.14-0.51 mm/ min), sendiment yield (62.16-118.66 g/ L) and soil detachment rate (19.38-202.58 g/ (m2·s)) of the disturbed land are respectively 0.44-0.73 times, 10-39 times and 9-79 times as great as that (0.31-0.61 mm/ min, 1.61-12.05 g/ ,L, 0.24-21.75 g/ (m2·s)) of the undisturbed land; 3)While in different slope gradients ranging from 5°to 18°, the average sentiment yield (36.19-155.96 g/ L) and soil detachment rate (0.79-2.70 g/ (m2·s)) of the disturbed land was respectively 11-23 times and 14-22 times as great as that (3.27-9.62 g/ L, 0.05-0.19 g/ (m2·s)) of the undisturbed land; 4) Further analysis indicates that power regress function exits significantly in the average soil detachment rate with flow discharge and slope gradient about the undisturbed and disturbed land. The results could give very important reference to restore and reconstruct the eco-environment and estimate the soil erosion of the coal fields.
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Received: 20 January 2012
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