[1]CAI Xiongfei,LEI Li,WANG Ji,et al.Effect of Antecedent Soil Water Content on Runoff and Sediment in Limestone Soil of Slopes in Karst Mountain Area[J].Research of Soil and Water Conservation,2019,26(01):29-33.
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Effect of Antecedent Soil Water Content on Runoff and Sediment in Limestone Soil of Slopes in Karst Mountain Area
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 01
Page number:
29-33
Column:
Public date:
2019-02-28
- Title:
- Effect of Antecedent Soil Water Content on Runoff and Sediment in Limestone Soil of Slopes in Karst Mountain Area
- CLC:
- S157.2
- DOI:
- -
- Abstract:
- To study the effect of antecedent soil water content on the processes and mechanism of runoff and sediment on sloping farmland in karst mountain area, the wet, slightly wet and dry limestone soils which wide distributed in Karst mountain area were selected, the processes and characteristics of runoff and sediment yields in limestone soil slopes under different antecedent soil moisture levers were systematically tested by rainfall simulation experiment. The results showed that:(1) the initial-yielding times of runoff on slopes decreased with increase of antecedent soil water contents under different slopes, and there was the negative linear relation between the initial-yielding time of runoff and the antecedent soil water content; (2) the runoff tended to increase within 0~25 min, the rates of change decreased in the order:slightly wet soil > dry soil > wet soil, and then gradually stabilized and the rates of runoff increased with increase of antecedent soil water contents and slopes; (3) the sediment concentration in slope with the slightly wet soil changed little, it had great variation in slope with the dried soil, it increased until 20 min and then decreased slowly and tended to be stable; the sediment concentration in slope with the wet soil had most variation, and which sharply declined, slowly increased and finally gradually decreased and tended to be stable as the whole; (4) there was approximate parabola-shape variation between average sediment concentration and the antecedent soil water content, average sediment concentrations decreased in the sequence:wetted soil > dried soil > slightly wetted soil.
- References:
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1900-01-01