DOI: 10.1016/j.watres.2019.02.010
Scopus记录号: 2-s2.0-85061961980
论文题名: Associating the spatial properties of a watershed with downstream Chl-a concentration using spatial analysis and generalized additive models
作者: Kim J.H. ; Lee D.H. ; Kang J.-H.
刊名: Water Research
ISSN: 431354
出版年: 2019
卷: 154 起始页码: 387
结束页码: 401
语种: 英语
英文关键词: Chlorophyll a
; Generalized additive model
; Geographic information system
; Land use
; Soil taxonomy
; Watershed
英文摘要: We examined the relationship between downstream algal growth potential and the spatial environmental factors of both upland areas and stream buffer zones using spatial analysis and generalized additive models (GAMs). The models employed site-representative concentrations of chlorophyll a (Chl-a) from a total of 688 national water quality monitoring stations and the spatial factors of the corresponding 688 watersheds. The spatial environmental factors included topography, climate, land use class, soil type, and proximity of the monitoring station to the weir downstream and wastewater treatment plants (WWTPs). The explanatory power (adjusted R 2 or R adj 2 ) of the models was used to compare different spatial influential scales defined by stream buffers and upstream circular buffers. The spatial environmental factors of the entire watershed area better explained the inter-station variation in Chl-a than did those of the stream buffer and/or upstream circular buffer areas. However, the spatial environmental factors of watershed areas more than 25 km upstream circular buffer zones had only minor influence on the explainability of the models with regards to the inter-station variation in Chl-a levels. Generally, land use patterns were more strongly related to the inter-station Chl-a variation than were point sources of pollutants such as WWTPs. The two most influencing land uses on the inter-station Chl-a variation were urban and agricultural land uses, with varying relative contributions depending on the spatial influential scale: In general relative contribution of urban land use was larger at a larger spatial influential scale while that of agricultural land use showed an opposite trend. In addition, the proximity to the weir downstream explained high Chl-a concentrations in the stream water. Relative importance and causal effects of the spatial environmental variables to instream Chl-a were established based on this national scale correlative analysis, leading to decision-making with the goal of controlling instream algal growth. © 2019 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/121931
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Civil and Environmental Engineering, Dongguk University-Seoul, 30, Pildong-ro 1gil, Jung-gu, Seoul, 04620, South Korea
Recommended Citation:
Kim J.H.,Lee D.H.,Kang J.-H.. Associating the spatial properties of a watershed with downstream Chl-a concentration using spatial analysis and generalized additive models[J]. Water Research,2019-01-01,154