辽西低山丘陵区坡地砾石含量及粒径对土壤入渗性能的影响

发布时间：2018-09-01 19:20

【摘要】：基于室内土柱模拟试验对比分析辽西低山丘陵区坡地不同粒径及砾石含量的土壤入渗规律,并采用4种模型分析了含砾石土壤对传统土壤入渗模型的适用性。结果表明:粒径一定时,随砾石含量的增加土壤累积入渗量减少,随累积入渗量的增加土柱湿润锋变化速率由小变大;砾石含量小于20%时,湿润锋前进到一定深度下,土壤累积入渗量随粒径的增加而增大;当砾石含量增大到一定值时,砾石含量相同直径不同的土壤累积入渗量与湿润锋随时间的变化基本无差异。累积入渗量与湿润锋推进距离呈良好的线性关系。利用Green-Ampt模型、通用模型、Horton模型和Kostiakov模型对入渗率与入渗历时的关系进行拟合,其中砾石含量为5%时,Horton模型拟合效果最好,砾石含量为10%~30%时通用模型适用性更强,Horton模型拟合效果最差,其他模型拟合效果因砾石含量及粒径等因素的不同而异。
[Abstract]:Based on the laboratory soil column simulation test, the soil infiltration law of different particle size and gravel content in sloping land of low mountain and hilly region in western Liaoning Province was analyzed, and the applicability of gravel soil to the traditional soil infiltration model was analyzed by using four kinds of models. The results showed that the soil cumulative infiltration decreased with the increase of gravel content, the change rate of soil column wetting front changed from small to large with the increase of cumulative infiltration amount, and when gravel content was less than 20, the wetting front advanced to a certain depth. The cumulative infiltration of soil increased with the increase of particle size, and when the gravel content increased to a certain value, there was no difference between the cumulative infiltration amount of soil and the wetting front with the same diameter of gravel content. There is a good linear relationship between the cumulative infiltration and the propulsive distance of the wetting front. Green-Ampt model, general model Horton model and Kostiakov model were used to fit the relationship between infiltration rate and infiltration duration. The fitting effect of Horton model is the worst when the gravel content is 10 ~ 30. The fitting effect of other models varies with gravel content and particle size.
【作者单位】：辽宁工程技术大学环境科学与工程学院;
【基金】：国家自然科学基金项目“干旱胁迫下科尔沁沙地主要防护林树种CNP化学计量特征及其影响机制”(31400613)
【分类号】：S152.72

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