EFFECTS OF UNDERGROUND PORE FISSURES ON SOIL EROSION AND SEDIMENT YIELD ON KARST SLOPES
EFFECTS OF UNDERGROUND PORE FISSURES ON SOIL EROSION AND SEDIMENT YIELD ON KARST SLOPES
复制标题
岩溶斜坡地下孔隙裂隙对土壤侵蚀及产沙的影响
DOI：
10.1002/ldr.2711
复制
发表时间：
2017-10-01
影响因子：
4.7
通讯作者：
Yang, Zhi
中科院分区：
文献类型：
--
作者：
Dai, Quanhou;Peng, Xudong;Yang, Zhi
地下孔隙裂隙是土壤渗漏的常见途径之一，岩溶地区地下孔隙裂隙中的土壤流失会加剧岩溶地区的石漠化发展。利用自行设计的不同孔隙裂隙度的钢水槽，研究了岩溶裸坡地下孔隙裂隙对土壤侵蚀产沙的影响。结果表明，地表和地下的产沙率及其分配比存在明显差异。地表产沙率对雨强条件响应较大，而地下产沙率变化不大。基岩裸露度和地下孔隙裂隙度对地表和地下产沙率的影响均不显著，但基岩裸露度对地表和地下泥沙分配的影响较大。随着基岩裸露率的增加，地表和地下平均产沙率均呈现先增加后减小的趋势。后者对地下产沙率产生影响，随地下孔隙裂隙度的增大而增大。随着地下孔隙裂隙程度的增加，产生地表泥沙的临界雨强由0.8-1.3 mm min−1增加到1.3-2.0 mm min−1。研究结果为地下孔隙裂隙对土壤侵蚀产沙的影响提供了一个机理性的认识。版权所有© 2017约翰威利父子有限公司.
Underground pore fissure is one of common ways of soil leakage, and the soil loss in underground pore fissure would aggravate the development of rocky desertification in karst areas. A designed steel tank with varied underground pore fissure degrees was used to measure how underground pore fissure affected soil erosion and sediment yield on karst bare slope. We found that sediment yield rates and its distribution ratios obviously differed between the surface and underground. Surface sediment yield rate greatly responded to rainfall intensity conditions, while underground sediment yield rate rarely changed. Both bed rock bareness and underground pore fissure degree had an insignificant effect on both surface and underground sediment yield rate, but the former greatly influenced sediment distribution between the surface and underground. With increasing of bed rock bareness rate, both the average surface and underground sediment yield rates first increased and then decreased. The later posed an effect on underground sediment yield rate, which increased with increase of underground pore fissure degree. With increase of underground pore fissure degree, critical rainfall intensity for producing surface sediment would increase from 0.8–1.3 mm min−1 to 1.3–2.0 mm min−1. The results provide a mechanistic understanding of how underground pore fissure affects soil erosion and sediment production. Copyright © 2017 John Wiley & Sons, Ltd.