| This article has been：Browse 2057Times Download 3092Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.20180404 |
|
| Types of Drainage Network Impact Attenuation of Dissolved Contaminants |
|
SUN Shaojiang, LUO Wan, ZOU Jiarong, WU Wang, JIA Zhonghua, ZHANG Zhixiu, ZHU Weibin
|
|
1. College of Water Resources and Hydro-power Engineering, Yangzhou University, Yangzhou 225009, China;2. Administrative Office of Yanyun Irrigation Area in Jiangdu District, Yangzhou 225261, China;3. River Management Office of Jiangdu District, Yangzhou 225200, China
|
| Abstract: |
| 【Objective】 The overarching objective of this paper is to experimentally examine the impact of drainage network types on attenuation of agricultural pollutants. 【Method】 The comparative experiments were conducted at two sites: One was Lubotan at Fuping in Shaanxi province where the drainage system was ditches, and the other one was Jiangdu at Yangzhou in Jiangsu province where the drainage system was combination of ponds and a small number of small ditches. For each site, we analyzed the removal rate of agrochemical contaminants.【Result】 The system at Jiangdu site was 7%~36% more efficient than that at Lubotan site in removing agrochemical pollutants. At Lubotan, the contaminants were mainly degraded in the ditches, while at Jiangdu, the contamination attenuation occurred in ponds and large ditches. On both sites, contamination attenuation was positively related to the areas of the ditch and the ponds. 【Conclusion】 Drainage network types control retention time of pollutants, and those with more ponds and a number of small ditches are more efficient in degrading pollutants. |
| Key words: farmland drainage; diches and ponds system; hydraulic condition; water quality improvement; removal efficiency |
|
|
