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http://dx.doi.org/10.17663/JWR.2012.14.2.223

Sediments and Design Considerations in the Forebay of Stormwater Wetland  

Park, Kisoo (한서대학교 환경공학과)
Cheng, Jing (한서대학교 환경공학과)
Kim, Youngchul (한서대학교 환경공학과)
Publication Information
Journal of Wetlands Research / v.14, no.2, 2012 , pp. 223-235 More about this Journal
Abstract
In this paper, field study results about accumulation of sediments and its property in the forebay of wetland aiming at stormwater from rural area wherein intensive cow feeding lots are operated are provided. In addition, some design aspects are discussed. Amount of sediment generation in the longitudinal direction of forebay was found to be affected by hydrological factors such as rainfall depth and intensity. Nutrient contents in the sediments of this wetland were 10 times higher than those in stormwater wetland in rural area without animal-feeding lot. Total-Pb and As contents show similar level to values from the soils of surrounding watershed, but Total-Cu content was higher due to the animal feeding lots. Yearly amount of sediment generation, its depth and volume were estimated to 13tons, 23cm, and $65m^3$. Based on these results and recommended guideline by Korean Ministry of Environment, dredging frequency was found to be about 2.7years. The shape of forebay has to be carefully designed to deal with a great change in flow rate. According to the results of sediment depth analysis, instead of the present rectangular, wedge-shape forebay is more desirable in handling scouring caused by high flows.
Keywords
Forebay; Nutrient; Nonpoint Pollution; heavy metals; sediment; stormwater wetland;
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