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

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...

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Bibliographic Details
Published in农业工程学报 Vol. 33; no. 13; pp. 143 - 150
Main Author 鲜青松 唐翔宇
Format Journal Article
LanguageChinese
Published 中国科学院水利部成都山地灾害与环境研究所,成都 610041 2017
中国科学院大学,北京 100049%中国科学院水利部成都山地灾害与环境研究所,成都,610041
Subjects
土壤
坡耕地
径流
紫色土
胶体
裂隙潜流
裂隙潜流
fracture flow
胶体
径流
runoff
sloping farmland
坡耕地
soils
colloids
purple soil
紫色土
土壤
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ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2017.13.019

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Summary: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。
Bibliography:soils; runoff; colloids; purple soil; sloping farmland; fracture flow
11-2047/S
Xian Qingsong1,2, Tang Xiangyu1（1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China）
Colloids are defined as suspended fine particles with 〈10μn diameter, which are ubiquitously present in subsurface geologic media. Excessive transport of colloids from terrestrial to aquatic environments may lead to various adverse impacts. It is important to quantify the export of colloids from agricultural field via surface runoff and subsurface flows as they may act as carriers of various strongly sorbing contaminants （e.g., radionuclides, heavy metals, pesticides）. A field study on the dynamics of flow processes and associated colloid transport was carried out in a 1 500 m2 sloping （6°） farmland plot with thin purple soil layer overlying fractured mudrock in the hilly area of central Sichuan Basin, Southwest China. The plot was hy
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2017.13.019