Effects of raindrop energy on runoff, chemicals and sediment transport in red soil slope

被引：0
|
作者：
Wang, Hui [1 ]
Ping, Li'na [1 ]
Shen, Ziyan [1 ]
Gong, Enlei [1 ]
机构：
[1] College of Engineering, Hunan Agricultural University, Changsha
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2014年 / 45卷 / 12期
关键词：
Rainfall energy; Red soil slope; Soil erosion; Solute transport; Surface runoff;
D O I：
10.6041/j.issn.1000-1298.2014.12.025
中图分类号：
学科分类号：
摘要：
Kinetic energy from rainfall is one of the most active factors impacting soil chemicals transport in runoff and the chemicals transport by rainfall splash is usually the first step. Effects of raindrop kinetic energy on the transport of soluble chemicals and sediment to runoff and infiltration into a clay red soil were quantified. The runoff, chemical and sediment transfer were investigated in small soil beds for five kinetic energy of raindrops obtained by varying heights of fall (0, 0.7, 1.0, 2.5 and 4.0 m), using a drip-type simulator. Runoff lag time, water content in surface and depth of water infiltration decreased linearly with increasing of the droplet energy flux (DE). The relationships of total runoff(TR), sediment yield(SY) and DE were described by power and logarithmic functions, respectively. The bromide transport in surface runoff was best described by a power decay model with the decay coefficients related to rainfall energy. The concentration of dissolved phosphorus in runoff increased linearly with time and the relation between the amount of total phosphorus (TP) loss to runoff and DE was an exponential function. The vertical transport of bromide and phosphorus within the soil matrix was strongly dependent upon the raindrop impact. ©, 2014, Chinese Society of Agricultural Machinery. All right reserved.
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页码：165 / 170and223
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