Jag C162对黄土坡面降雨入渗的调控效应研究

在土壤中添加高分子化合物是一种新兴的水土保持措施,阐明其对水土流失的影响可为黄土坡面水土流失治理及其措施选择提供科学依据。采用人工模拟降雨试验,研究新化学材料Jag C162对黄土坡面降雨入渗的调控效应。主要结果有:(1)撒施不同剂量Jag C162后,随着降雨时间的增加,入渗率呈减少的趋势,撒施Jag C162的入渗率减小速率均小于裸土;降雨过程中裸土达到了稳渗阶段,而撒施Jag C162的入渗率没有达到稳定状态;初始产流的时间也相应的推迟。(2)同坡度不同雨强和同雨强不同坡度下,撒施Jag C162后,入渗率显著提高。随着雨强和坡度的增大,裸土的稳定入渗率增加,3种不同撒施剂量下的平均入渗率减小。(3)撒施Jag C162的入渗量明显高于裸土的入渗量,在不同剂量下,入渗量随雨强的增加而呈现递增变化总趋势;入渗量随坡度的增加而减小。(4)撒施Jag C162可增加入渗率,减少地表径流和土壤侵蚀。

Regulating Effect of Jag C162 Application on Infiltration on Loess Slope

It is an emerging measure of soil and water conservation to add polymers in soil. Clarifying its effects on soil erosion can provide a scientific basis for controlling soil erosion and selecting measures on loess slope. A simulated rainfall experiment was conducted to study the regulating effect of new chemical materials Jag C162 on infiltration on loess slope. Results showed that:(1) After dry spreading Jag C162, infiltration rate showed a decreasing trend with increasing rainfall time, whose decrease rate was less than bare soil. During rainfall, infiltration into bare soil reached a steady infiltration stage, while infiltration rate did not reach a steady state after dry spreading Jag C162. Initial runoff time was postponed correspondingly. (2) For the slope with different rainfall intensities and the rainfall intensity with different slopes, infiltration rate had significantly increased after dry spreading Jag C162. The stable infiltration rate of bare soil and average infiltration rate after dry spreading showed an increasing trend with increasing rainfall intensity and decreased with increasing slope. (3) Infiltration capacity for dry spreading Jag C162 was significantly higher than bare soil. With different doses, the infiltration capacity presented a general incremental trend with rainfall intensity increased, and infiltration capacity was decreased with slope increasing. (4) After dry spreading Jag C162, infiltration rate was increased and surface runoff and soil erosion were reduced.