| 研究论文 |
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| Evolution of Streamwise Sand Transport with Distance |
| LI Zhen-shan, ZHANG Qi-feng |
| Department of Environmental Engineering, Peking University;The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China |
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Abstract A simple theoretical expression for evolution of streamwise sand transport with distance was put forward. Wind erosion is consisted of two parts, fluid erosion and impact erosion. Fluid erosion is induced by the force of airflow directly exerted on the bed while impact erosion results from the impaction of saltating grains on the bed. The former depends on the difference between local and saturation sand transport rates, while the later is merely associated with the local sand transport rate. An analytic expression for sand transport rate with distance was deduced by introducing two parts of wind erosion into the continual equation of erosion. Prediction from the expression was compared with the measurement in the wind tunnel, and satisfactory agreement was achieved. Based on the expression, two erosion rates with distance, fluid and impacting erosion rates, were deduced. Fluid erosion rate decreases with distance while impacting one firstly increases and then decreases with distance. Also, an expression of saturation length of sand transport was introduced.
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Received: 07 December 2004
Published: 20 March 2006
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[1]Chepil W S, Milne R A. Wind erosion of soils in relation to size and nature of the exposed area[J].Scientific Agriculture,1941, 21(7): 479-487.
[2]Chepil W S. Dynamics of wind erosion, V. Cumulative intensity of soil drifting across eroding field[J]. Soil Science, 1946, 61(3): 257-263.
[3]Chepil W S. Wind erodibility of farm fields[J]. Journal of Soil and Water Cons.,1959, 14: 214-219.
[4]Woodruff N P, Sideways F H. A wind erosion equation[J]. Soil Science Society Proceedings, 1965, 29: 602-608.
[5]吴正,等.风沙地貌与治沙工程学[M].北京：科学出版社, 2003. 100-105.
[6]张春来,邹学勇,董光荣,等. 耕作土壤表面的空气动力学粗糙度及其对土壤风蚀的影响[J] .中国沙漠, 2002, 22(5): 473-475.
[7]黄宁,郑晓静. 沙粒跃移云及Magnus力对床面有效粗糙度的影响[J].中国沙漠, 2003, 23(6): 616-620.
[8]邢茂,郭烈锦. 紊流风场中起跳沙粒的轨迹特征[J].中国沙漠, 2003, 23(6): 628-631.
[9]慕青松,苗天德,马崇武. 不均匀沙起动理论及戈壁风蚀层形成动力学[J].中国沙漠,2004, 24(3): 268-273.
[10]吕萍,董治宝. 戈壁风蚀面与植被覆盖面地表性质粗糙度长度的确定[J]. 中国沙漠, 2004, 24(3): 279-286.
[11]Shao Y, Raupach M R. The overshoot and equilibrium of saltation[J]. Journal of Geophysical Research,1992, 97:20559-20564.
[12]Gillette D A, Herbert G, Stockton P H, et al.Causes of the fetch effect in wind erosion[J]. Earth Surface Processes and Landforms, 1996, 21(7): 641-660.
[13]Zhibao Dong, Hongtao Wang, Xiaoping Liu,et al. The blown sand flux over a sandy surface: a wind tunnel investigation on the fetch effect[J]. Geomorphology, 2004, 57:117-127.
[14]Stout J E. Wind erosion within a simple field[J]. Tran. ASAE, 1990, 33:1597-1600.
[15]Fryrear D W,Saleh A. Wind Erosion: Field Length[J]. Soil Science,1996,161 (6): 398-404
[16]Sorensen M, McEwan I. On the effect of mid-air collisions on aeolian saltation[J]. Sedimentology,1996. 43: 65-76
[17]Dong Zhibao, Liu Xiaoping, Li Fang, et al. Impact-entrainment relationship in a saltating cloud[J]. Earth Surf. Process. Landforms,2002, 27:641-658.
[18]McEwan I K, Willetts B B. On the prediction of bed-load sand transport rate in air[J]. Sedimentology, 1994, 41: 1241-1251.
[19]Rice M A, Willetts B B, McEwan I K. Observations of collisions of saltating grains with a granular bed from high-speed cine-film[J]. Sedimentology, 1996, 43: 21-31
[20]Bagnold R A. The physics of blown sand and desert dunes[M]. London: Methuen, 1941.
[21]Graton L C, Fraser H J. Systematic packing of spheres with particular relation to porosity and permeability[J]. The Journal of Geology, 1935, XLIII(8): 785-909.
[22]兹纳门斯基 A Й(杨郁华译).沙地风蚀过程的实验研究和沙堆防止问题[M].北京:科学出版社, 1960.
[23]Owen P R. The physics of sand movement[R]. Lecture Notes, Workshop on Pphysics of Flow in Desert. Trieste, International Centre for Theoretical Physics, 1980. |
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2006, Vol. 26 
