[1]AI Jianwei,GAO Zhaoliang,LOU Yongcai,et al.Effects of Sediment Concentration on Hydrodynamic Characteristics of Runoff on High and Steep Slope[J].Research of Soil and Water Conservation,2023,30(04):75-82.[doi:10.13869/j.cnki.rswc.2023.04.016.]
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Effects of Sediment Concentration on Hydrodynamic Characteristics of Runoff on High and Steep Slope
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 04
Page number:
75-82
Column:
Public date:
2023-06-10
- Title:
- Effects of Sediment Concentration on Hydrodynamic Characteristics of Runoff on High and Steep Slope
- CLC:
- S157.1
- DOI:
- 10.13869/j.cnki.rswc.2023.04.016.
- Abstract:
- [Objective] The aim of this study is to reveal the influence of sediment concentration on the hydrodynamic characteristics of high and steep slopes, which can provide theoretical support for improving the accuracy of soil erosion mechanism model of high and steep slopes. [Methods] Three sediment concentration gradients(0, 4%, 8%)and three flow rate gradients(12, 16, 20 L/min)were set, the field runoff scouring experiment was carried out on a 36° slope. [Results] With the increase of flow rate, the trend of the average flow velocity decreasing with the increase of sediment concentration is small, and the trend of Reynolds number(Re)decreasing with the increase of sediment concentration is more obvious; when the discharge flow rates are 16 L/min and 20 L/min, with the increase of sediment concentration, the slope flow pattern gradually transforms from turbulence to transition; the Froude number(Fr)increases with the increase of sediment concentration, and is greater than 1, and the slope runoff flow pattern belongs to the supercritical flow. The Darcy-Weisbach resistance coefficient(f)and the Reynolds number(Re)have a very significant power function relationship, and with the increase of the sediment concentration, the influence of the Reynolds number (Re)on the Darcy-Weisbach resistance coefficient(f)is gradually weakened. There is a very significant negative correlation between sediment concentration and average flow velocity, Reynolds number, Darcy-Weisbach(f), runoff power(ω) and runoff shear stress(τ) (p<0.01), and the order of absolute value of correlation coefficient is R(Re)>R(ω)>R(τ)>R(ν)>R(f), the Reynolds number (Re)is the best parameter to describe the relationship between hydrodynamic parameters and sediment concentration, the relationship between sediment concentration and Froude number(Fr)is not significant, but is represented to Reynolds number (Re), runoff power(ω), runoff shear stress(τ), and average flow velocity by a binary linear function. [Conclusion] The sediment concentration has a great impact on the hydrodynamic characteristics of high and steep slopes. In the future, the slope length, slope gradient, fluid properties and other variables should be added to further study the relationship between the sediment concentration and the hydrodynamic parameters of slope surface, laying a theoretical foundation for the establishment of the soil erosion mechanism model of high and steep slopes.
- References:
-
[1] 骆汉,赵廷宁,彭贤锋,等.公路边坡绿化覆盖物水土保持效果试验研究[J].农业工程学报,2013,29(5):63-70.
[2] Yang D, Gao P, Zhao Y, et al. Modeling sediment concentration of rill flow[J]. Journal of Hydrology, 2018,561:286-294.
[3] 赵春红,高建恩,王飞,等.含沙量对坡面流水动力学特性的影响研究[J].农业机械学报,2013,44(9):79-85.
[4] 袁和第,信忠保,蒋秋玲,等.连续降雨作用下褐土坡面侵蚀及其水动力学特征[J].水土保持学报,2020,34(4):14-20.
[5] 李浩宏,王占礼,申楠,等.黄土坡面片蚀水流含沙量变化过程试验研究[J].中国水土保持,2015(3):46-49.
[6] 邓军,杨永全,沈焕荣,等.水流含沙量对磨蚀的影响[J].泥沙研究,2000(4):65-68.
[7] 潘成忠.坡面流水力学特性及其对草地拦沙的响应机制[D].陕西杨凌:中国科学院水利部水土保持研究所(中国科学院教育部水土保持与生态环境研究中心),2007.
[8] 王龙生,蔡强国,蔡崇法,等.黄土坡面发育平稳的细沟流水动力学特性[J].地理科学进展,2014,33(8):1117-1124.
[9] 余冰.含沙水流和坡面糙度对红壤团聚体输移破坏影响[D].武汉:华中农业大学,2017.
[10] 张锐波,张丽萍,付兴涛.坡面侵蚀产沙与水力学特征参数关系模拟[J].水土保持学报,2017,31(5):81-86.
[11] 冯乐.不同高陡边坡植被配置的水土保持效益研究[J].珠江水运,2021(21):17-18.
[12] 陈卓.黄土工程堆积体坡面含沙水流冲刷过程中产流产沙及水动力学特征研究[D].陕西杨凌:西北农林科技大学,2020.
[13] 卞艳丽,曹惠提,张会敏,等.泥沙级配对浑水灌溉下土壤水分增长过程的影响分析[J].节水灌溉,2016(7):23-30,35.
[14] Niu Y, Gao Z, Li Y, et al. Characteristics of rill erosion in spoil heaps under simulated inflow: A field runoff plot experiment[J]. Soil and Tillage Research, 2020, 202: 104655.
[15] Zhang L, Gao Z, Yang S, et al. Dynamic processes of soil erosion by runoff on engineered landforms derived from expressway construction: A case study of typical steep spoil heap[J]. Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution, 2015,128:108-121.
[16] 沙玉清.泥沙运动学引论[M].北京:中国工业出版社,1965.
[17] 罗榕婷,张光辉,沈瑞昌,等.染色法测量坡面流流速的最佳测流区长度研究[J].水文,2010,30(3):5-9.
[18] Foster G R, Huggins L F, Meyer L D. A laboratory study of rill hydraulics: II. Shear stress relationships[J]. Transactions of the ASAE, 1984, 27(3): 797-0804.
[19] 李永红,牛耀彬,王正中,等.工程堆积体坡面径流水动力学参数及其相互关系[J].农业工程学报,2015,31(22):83-88.
[20] Lou Y, Gao Z, Zhou F, et al. Rill erosion on slope of spoil tips: experimental study of runoff scouring erosion in multiple times[J]. Hydrology and Earth System Sciences, 2021:1-33.
[21] 李君兰,蔡强国,孙莉英,等.坡面水流速度与坡面含砂量的关系[J].农业工程学报,2011,27(3):73-78.
[22] 纪丽静,王文龙,康宏亮,等.黄土区土质与土石质土堆积体水力侵蚀过程差异[J].应用生态学报,2020,31(5):1587-1598.
[23] 张翔,高照良,袁雪红,等.工程堆积体坡面细沟流水力学参数特性研究[J].泥沙研究,2016(4):34-40.
[24] Abrahams A D, Atkinson J F. Relation between grain velocity and sediment concentration in overland flow[J]. Water Resources Research, 1993,29(9):3021-3028.
[25] 杨大明,高佩玲,张晴雯,等.黄土坡面细沟水动力学特性试验研究[J].泥沙研究,2018,43(4):49-56.
[26] 和继军,王硕,蔡强国,等.黄土缓坡片蚀过程及其水力参数适宜性试验研究[J].水科学进展,2021,32(1):97-108.
[27] 潘成忠,上官周平.不同坡度草地含沙水流水力学特性及其拦沙机理[J].水科学进展,2007,18(4):490-495.
[28] 倪世民,冯舒悦,王军光,等.不同质地重塑土坡面细沟侵蚀形态与水力特性及产沙的关系[J].农业工程学报,2018,34(15):149-156.
[29] 张乐涛,董俊武,张晨,等.黄土坡面径流侵蚀泥沙的空间动态及其尺度关系[J].泥沙研究,2021,46(1):42-49.
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Last Update:
2023-06-10