张攀,姚文艺,肖培青,刘国彬,杨春霞.黄河流域砒砂岩区多动力侵蚀交互叠加效应研究[J].水利学报,2022,53(1):109-116 |
黄河流域砒砂岩区多动力侵蚀交互叠加效应研究 |
Interactive superposition effect of multi-dynamic erosion in the Pisha sandstone area of the Yellow River basin |
投稿时间:2021-04-14 |
DOI:10.13243/j.cnki.slxb.20210349 |
中文关键词: 冻融-风力-水力复合侵蚀 多动力交互 土壤侵蚀机理 试验模拟 砒砂岩区 |
英文关键词: freezing-thawing-wind-water erosion multi-dynamic interaction soil erosion mechanism test simulation Pisha sandstone area |
基金项目:国家重点研发计划项目(2017YFC0504501);国家自然科学基金项目(42041006,41877079);中国博士后科学基金(2019T120627,2018M630826) |
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中文摘要: |
识别砒砂岩区多动力侵蚀的叠加效应,对于深化认识砒砂岩区土壤侵蚀与产沙机理,为黄河粗泥沙来源区水土流失治理及砒砂岩区生态恢复等实践提供科学依据具有重要意义。通过室内人工降雨-风洞-冻融循环实体模型试验研究了砒砂岩区多动力侵蚀交互叠加效应。试验结果表明:单一的冻融、风蚀作用不会导致坡面产沙量的明显增加,而是增加了水力侵蚀的物质来源,只有在水力、重力等驱动因子的复合作用下才能对侵蚀产沙过程发生显著影响;砒砂岩表面风化层的存在是影响风蚀产沙的一个重要因素;复合侵蚀过程存在着显著的叠加放大效应,“冻-水”叠加效应约放大到127%,“冻-风-水”叠加效应放大至164%;砒砂岩区多动力交互作用产生的侵蚀叠加放大效应,是使其成为黄河粗泥沙核心来源区的重要原因之一。因此,复合侵蚀不是多类单相侵蚀的线性叠加,而是具有显著的非线性叠加放大效应。 |
英文摘要: |
Identifying the interactive superposition effect of multi-dynamic erosion in Pisha sandstone area is of great significance for further understanding the mechanism of soil erosion and sediment yield, providing scientific basis for soil erosion control and ecological restoration in Pisha sandstone area. Through the indoor artificial rainfall, wind tunnel and freezing-thawing cycle solid model test, the interactive superposition effect of multi-dynamic erosion in Pisha sandstone area was studied. The results show that:single freezing-thawing and wind erosion will not lead to significant increase of sediment yield, but will increase the material source of hydraulic erosion. Only under the combined action of hydraulic and gravity driving factors can the process of erosion and sediment yield be significantly affected. The presence of a weathered layer on the surface of Pisha sandstone is an important factor affecting wind erosion and sand production. The complex erosion process has a significant superimposed amplification effect, the superposition amplification effect of "freezing-thawing-water erosion" and "freezing-thawing-wind-water erosion" are enlarged to 127% and 164% respectively. The superimposed amplification effect of erosion caused by multi-dynamic interaction in Pisha sandstone area is one of the important reasons that makes it become the core source area of coarse sediment in the Yellow River. Therefore, complex erosion is not a linear superposition of multiple types of single-phase erosion, but has a significant nonlinear superposition amplification effect. |
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