有黏性和无黏性沙坡面流的挟沙力比较

doi:10.16843/j.sswc.2018.06.002

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Abstract [Background] Flow transport capacity refers to the maximum flux of sediment that can be transported under specific hydrodynamic conditions, and is an important parameter of soil erosion process model. Domestic and foreign scholars have carried out research works on the flow transport capacity of overland flow; however, the experimental materials are relatively simple, and the soil is not fully considered in the object of the overland flow and the experimental object is concentrated in the non-cohesive sand. Therefore, it is necessary to compare the flow transport capacity of overland flow between cohesive and non-cohesive sand.[Methods] The cohesive sand (sampled from black soil of Nenjiang county in Heilongjiang province and the median particle size of 0.28 mm) was used as experimental material. The experiment was designed with 5 slope degrees (3°,6°,9°,12°,and 15°) and 6 flow rates(0.25, 0.50, 0.75, 1.00, 1.50, and 2.00×10^-3 m³/s), totally 30 experiments. The experiments were carried out in a flume with 5.0 m long and 0.4 m wide. Dyeing method was to measure the flow rate. The hydraulic parameters and the flow transport capacity of cohesive sand were processed using SPSS software and Origin software, and graphed to obtain the relationship between the flow transport capacity of the cohesive sand and the different hydraulic parameters. The measured results were compared with the ones calculated by equations previously from non-cohesive sand in our laboratory.[Results] 1) Flow transport capacity of both the cohesive sand and the non-cohesive sand increased with the increase of the flow velocity, shear stress and stream power. 2) Under the same hydrodynamic conditions, the flow transport capacity of the cohesive sand was greater than that of non-cohesive sand. 3) The relationship between the flow transport capacity of the cohesive sand and the flow velocity, shear stress and stream power was expressed as a power function, and the coefficients of determination were 0.91, 0.72 and 0.80, respectively. The flow velocity was the best hydraulic parameter for calculating the flow transport capacity of cohesive sand. The shear stress and stream power provided the higher accuracy for calculating the flow transport capacity of the non-cohesive sand. The coefficients of determination were 0.98 and 0.98. 4) The measured critical flow velocity of cohesive sand was 0.245 m/s, <0.309 m/s calculated by the equation from the non-cohesive sand previously. The coefficient of determination and Nash-Sutcliffe efficiency coefficient of cohesive sand were 0.72 and 0.78 respectively, while the shear stress equation of non-cohesive sand was used to calculate the flow transport capacity of the cohesive sand. The coefficient of determination and Nash-Sutcliffe efficiency coefficient of cohesive sand were 0.80 and 0.43 respectively, while the stream power equation of non-cohesive sand was used to calculate the flow transport capacity of the cohesive sand. The coefficient of determination of cohesive sand was 0.20 while the relationship between the flow transport capacity of the cohesive sand and the unit stream power was fitted by a power function.[Conclusions] There are differences in flow transport capacity of a slope between cohesive and non-cohesive sand, he flow transport capacity equation obtained from non-cohesive sand is not suitable for cohesive sand.

Key words： soil erosion overland flow flow transport capacity

Received: 15 May 2018

PACS:

S157

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	Articles by authors
	YU Xianju
	LIU Chenguang
	FU Suhua
	MU Hongli
	WU Sinan
	LIU Yingna
	ZHANG Guanghui

Cite this article:

YU Xianju,LIU Chenguang,FU Suhua, et al. Comparison on flow transport capacity of overland flow between cohesive and non-cohesive sand[J]. SSWC, 2018, 16(6): 9-14.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2018.06.002 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2018/V16/I6/9

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