Assessing Effects of Small Dams on Stream Flow and Water Quality in an Agricultural Watershed
文献类型：SCI/SSCI论文
| 作者 | Liu Y. B. ; Yang W. H. ; Yu Z. Q. ; Lung I. ; Yarotski J. ; Elliott J. ; Tiessen K. |
| 发表日期 | 2014 |
| 关键词 | Small dam Stream flow Water quality Soil and water assessment tool (SWAT) South Tobacco Creek management-practices small ponds model reservoirs erosion agnps basin swat |
| 英文摘要 | Small dams and associated reservoirs have notable effects on soil and water dynamics in prairie streams. In this study, we developed a simulation module of small dams in the soil and water assessment tool (SWAT) to evaluate their long-term effects on stream flow and water quality at a watershed scale. To overcome the challenges in characterizing small storage and short retention time in small reservoir routing, concepts of equivalent reservoir storage and equivalent reservoir discharge are applied by which the average daily storage and daily discharge of the small reservoirs are calculated. Accordingly, the sediment deposition and nutrient abatement within the reservoir are computed using available SWAT routines. The effects of small dams in reduction of daily peak flow, sediment, and nutrient loads at the watershed outlet are obtained by summing the effects of all small dams within the watershed considering both reservoir and channel processes. The model is applied to the 74.6-km(2) South Tobacco Creek watershed located in Southern Manitoba of Canada. A total of 26 small dams exist in the watershed with surface area ranging from 0.002 to 0.492 km(2) and storage capacity from 3,380 to 642,000 m(3). The simulation results show that the combined effect of these small dams can reduce daily peak flow by 0-14% at the watershed outlet depending on climate and initial reservoir storage conditions. The estimated average annual sediment, total nitrogen and total phosphorus reductions at the watershed outlet are about 4.51, 3.59, and 2.96%, respectively. However, the on-site effects of individual small dams are much higher depending on its size, location, shape, drainage area, and land use compositions in the contribution area. The simulation results also show that snowmelt-flooding events have higher reduction amounts but lower relative reduction rates compared to rainfall storm events and the back-flood small dams have greater impact on sediment, nitrogen, and phosphorous abatement followed by multipurpose small dams and dry dams in the study watershed. (C) 2014 American Society of Civil Engineers. |
| 出处 | Journal of Hydrologic Engineering |
| 卷 | 19 |
| 期 | 10 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1084-0699 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/29712]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Liu Y. B.,Yang W. H.,Yu Z. Q.,et al. Assessing Effects of Small Dams on Stream Flow and Water Quality in an Agricultural Watershed. 2014. |
入库方式： OAI收割
来源：地理科学与资源研究所
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