薄层紫色土坡耕地胶体颗粒随地表径流及裂隙潜流迁移规律

发布时间：2018-07-06 09:52

本文选题：土壤 + 径流　；参考：《农业工程学报》2017年13期

【摘要】：为查明薄层紫色土坡耕地土-岩二元结构中胶体颗粒随地表径流和泥岩裂隙潜流迁移的规律,在2015年3场自然降雨事件中对1 500 m~2大型坡耕地径流场进行监测研究。结果表明:1)地表径流的产流方式主要受土壤前期水饱和度、降雨强度和历时影响;裂隙潜流则主要受降雨量控制,其峰值流量对降雨的响应滞后于地表径流30 min左右;坡中部和坡下部对地表径流、裂隙潜流的贡献明显高于坡上部。2)地表径流中胶体颗粒质量浓度数十倍于裂隙潜流,最高可达4 827 mg/L,单场降雨事件中地表径流胶体迁移总量可超过7 kg。3)地表径流和裂隙潜流中胶体迁移速度快于径流,胶体质量浓度峰值的出现早于径流量峰值;地表径流中的胶体颗粒质量浓度主要受土壤水饱和度和径流过程控制。该研究结果对于估算农田中胶体结合态污染物的迁移通量具有参考价值。
[Abstract]:In order to find out the migration of colloidal particles with surface runoff and mudstone fissure subsurface flow in thin layer purple soil sloping farmland, the runoff field of 1 500 mm2 large sloping farmland was monitored in three natural rainfall events in 2015. The results show that the runoff generation mode of surface runoff is mainly affected by water saturation, rainfall intensity and duration, and the peak flow response to rainfall lags behind that of surface runoff for about 30 min, while the subsurface flow of fissure is mainly controlled by rainfall. The contribution of fissure subsurface flow to surface runoff in the middle and lower part of slope is ten times higher than that in surface runoff. The maximum amount of colloid migration was 4 827 mg / L, the total amount of colloid migration of surface runoff in a single rainfall event could exceed 7 kg.3) the colloid migration rate in surface runoff and fissure subcurrent was faster than that in runoff, and the peak value of colloid mass concentration appeared earlier than the peak of runoff. The mass concentration of colloidal particles in surface runoff is mainly controlled by soil water saturation and runoff process. The results are useful for estimating the transport flux of colloidal bound pollutants in farmland.
【作者单位】：中国科学院水利部成都山地灾害与环境研究所;中国科学院大学;
【基金】：国家重点研发计划课题(2017YFD0800101) 国家自然科学基金项目(41471268,41430750)
【分类号】：S157.1

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