Several understandings for sediment transport capacity by overland flow
ZHANG Guanghui1,2
1. State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China; 2. Faculty of Geographic Science, Beijing Normal University, Beijing 100875, China
Abstract：Sediment transport capacity of overland flow, which is the maximum equilibrium sediment load that a flow can transport, is a key concept for developing process-based soil erosion models because it plays a pivotal role to determine soil detachment rate and sediment transport. Few studies have been conducted to investigate the mechanism of sediment transport capacity by overland flow on steep slopes. In this paper, based on the systematic definition of sediment transport capacity of overland flow, the influences and their mechanisms of hydraulic properties of overland flow and sediment characteristics on sediment transport capacity were deeply analyzed. Sediment transport capacity of overland flow has great spatial and temporal variations due to the comprehensive effects of precipitation, topography, soil, vegetation, land use, sealing formation, rill development, and gravel covering. Therefore, it is very difficult to measure sediment transport capacity of overland flow directly in field conditions. The commonly used methods to determine sediment transport capacity of overland flow can be categorized into the modification from river sediment transport capacity formula, the rational method, the model simulation, and the direct measurement. The advantages and disadvantages of each method were compared and analyzed. Further studies should be focus on the measuring methodology and techniques for sediment transport capacity of overland flow, the hydro-dynamic mechanism of sediment transport process, sediment transport capacities of typical soil types, transport capacity formula development and performance evaluation, and sediment transport capacity of overland flow under changeable conditions. It is helpful to summarize the conclusions of different studies, promote the research on sediment transport capacity of overland flow, and improve the prediction precision of the process-based soil erosion models for better service to water and soil conservation planning and design.
张光辉. 对坡面径流挟沙力研究的几点认识[J]. 水科学进展, 2018, 29(2): 151-158.
ZHANG Guanghui. Several understandings for sediment transport capacity by overland flow. Advances in Water Science, 2018, 29(2): 151-158.
张光辉. 坡面水蚀过程水动力学研究进展[J]. 水科学进展,2001, 12(3):395-402. (ZHANG G H. Advances in study of runoff detachment processes based on hydraulics[J]. Advances in Water Science, 2001, 12(3):395-402. (in Chinese))
[2]
段红东, 何华松, 朱辰华. 河流输沙力学[M]. 郑州:黄河水利出版社, 2001. (DUAN H D, HE H S, ZHU C H. Sediment transport mechanism of river[M]. Zhengzhou:The Yellow River Water Conservancy Press, 2001. (in Chinese))
[3]
NEARING M A, FOSTER G R, LANE L J, et al. A process-based soil erosion model for USDA-Water Erosion Prediction Project technology[J]. Transanctions of the American Society of Agricultural Engineerings, 1989, 32(5):1587-1593.
[4]
张光辉. 坡面薄层流水动力学特性的实验研究[J]. 水科学进展, 2002,13(2):159-165. (ZHANG G H. Study on hydraulic properties of shallowflow[J]. Advances in Water Science, 2002, 13(2):159-165. (in Chinese))
[5]
ZHANG G H, SHEN R C, LUO R T, et al. Effects of sediment load on hydraulics of overland flow on steep slopes[J]. Earth Surface Processes and Landforms, 2010, 35:1811-1819.
[6]
BEASLEY D B, HUGGINS L F. ANSWERS user's manual[R]. West Lafayette:Department of Agricultural Engineering, Purdue University, 1982.
[7]
ZHANG G H, LIU Y M, HAN Y F, et al. Sediment transport and soil detachment on steep slopes:I:transport capacity estimation[J]. Soil Science Society of America Journal, 2009, 73(4):1291-1297.
[8]
PROSSER I P, RUSTOMJI P. Sediment transport capacity relations for overland flow[J]. Progress in Physical Geography, 2000, 24:179-193.
[9]
GOVERS G. Empirical relationships for the transport formulae of overland flow[J]. IAHS Publ, 1990, 189:45-63.
[10]
NEARING M A, SIMANTON J R, NORTON L D, et al. Soil erosion by surface water flow on a stony, semiarid hillslope[J]. Earth Surface Processes and Landforms, 1999, 24:677-686.
[11]
YU B F. A unified framewrok for water erosion and deposition equations[J]. Soil Science Society of America Journal, 2003, 67:251-257.
[12]
栾莉莉,张光辉,王莉莉, 等. 基于水流功率的坡面流挟沙力模拟[J].泥沙研究,2016(2):61-67. (LUAN L L, ZHANG G H, WANG L L, et al. Study on sediment transport capacity of overland flow based on stream power[J]. Journal of Sediment Research, 2016(2):61-67. (in Chinese))
[13]
de ROO A P, WESSELING C G, RITSEMA C J. LISEM:A single-event physically based hydrological and soil erosion model for drainage basins:I:theory, input and output[J]. Hydrological Processes, 1996, 10:1107-1117.
[14]
MORGAN R P, QUINTON J N, SMITH R E, et al. The European Soil Erosion Model (EUROSEM):documentation and user guide, Version 3.6[R]. Silsoe:Cranfield University, 1998.
[15]
ZHANG G H, WANG L L, TANG K M, et al. Effects of sediment size on transport capacity of overland flow on steep slopes[J]. Hydrological Sciences Journal, 2011, 56(7):1289-1299.
[16]
CHENG N S. Simplified settling velocity formula for sediment particle[J]. Journal of Hydraulic Engineering-ASCE, 1997, 123(2):149-152.
[17]
GUY B T, DICKENSON W T, SOHRABI T M, et al. Development of an empirical model for calculating sediment transport capacity in shallow overland flows:model calibration[J]. Biosystem Engineering, 2009, 103:245-255.
[18]
MISRA R K, ROSE C W. Application and sensitivity analysis of process-based erosion model GUEST[J]. European Journal of Soil Science, 1996, 47(4):593-604.
[19]
YALIN Y S. An expression for bed-load transportation[J]. Journal of Hydraulics Division, American Society of Civil Engineers, 1963, 89:221-250.
[20]
ZHANG G H, LIU B Y, ZHANG X C. Applicability of WEPP sediment transport capacity equation to steep slopes[J]. Transactions of the American Society of Agricultural and Biological Engineerings, 2008, 51(5):1675-1681.
[21]
ZHANG G H, WANG L L, LI G, et al. Relationship between sediment size and transport coefficient on steep slopes[J]. Transactions of the American Society of Agricultural and Biological Engineers, 2011, 54(3):869-874.
[22]
FOSTER G R, MEYER L D. A closed-form soil erosion equation for upland areas[C]//SHEN H W. Proceeding of Sedimentation Symposium to Honor Professor HA Einstein. Fort Collins:Colorado State University, 1972:1-19.
[23]
雷廷武, 张晴雯, 闫丽娟. 细沟侵蚀物理模型[M]. 北京:科学出版社, 2008. (LEI T W, ZHANG Q W, YANG L J. Physical model of rill erosion[M]. Beijing:Science Press, 2008. (in Chinese))
[24]
ZHANG G H, LIU Y M, HAN Y F, et al. Sediment transport and soil detachment on steep slopes:Ⅱ:sediment feedback relationship[J]. Soil Science Society of America Journal, 2009, 73(4):1298-1304.
[25]
张光辉. 土壤分离能力测定的不确定性分析[J]. 水土保持学报, 2017, 31(2):1-6. (ZHANG G H. Uncertainty analysis of soil detachment capacity measurement[J]. Journal of Soil and Water Conservation, 2017, 31(2):1-6. (in Chinese))
[26]
张光辉, 卫海燕, 刘宝元. 自控型供沙漏斗的研制[J]. 水土保持通报, 2001, 21(1):63-65. (ZHANG G H, WEI H Y, LIU B Y. Development of self-controlled sediment feeding Hopper[J]. Bullitin of Soil and Water Conservation, 2001, 21(1):63-65. (in Chinese))
[27]
WANG Z, YANG X, LIU J, et al. Sediment transport capacity and its response to hydraulic parameters in experimental rill flow on steep slope[J]. Journal of Soil and Water Conservation, 2015, 70(1):36-44.
[28]
WU B, WANG Z, SHEN N, et al. Modelling sediment transport capacity of rill flow for loess sediments on steep slopes[J]. Catena, 2016, 147:453-462.
[29]
张光辉. 退耕驱动的近地表特性变化对土壤侵蚀的潜在影响[J]. 中国水土保持科学, 2017, 15(4):143-154. (ZHANG G H. Potential effects of changes in near soil surface characteristics driven by farmland abandonment on soil erosion[J]. Science of Soil and Water Conservation, 2017, 15(4):143-154. (in Chinese))
2018, Vol. 29 
