Watershed and lake water quality assessment: An integrated modeling approach

被引:17
作者
Mankin, KR [1 ]
Koelliker, JK [1 ]
Kalita, PK [1 ]
机构
[1] Kansas State Univ, Manhattan, KS 66506 USA
来源
JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION | 1999年 / 35卷 / 05期
关键词
agricultural hydrology; AGNPS; modeling; nonpoint source pollution; water quality;
D O I
10.1111/j.1752-1688.1999.tb04194.x
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Watershed planning groups and action agencies seek to understand how lake water quality responds to changes in watershed management. This study developed and demonstrated the applicability of an integrated modeling approach for providing this information. An integrated model linking watershed conditions to water-quality of the receiving lake incorporated the following components: (1) an event-based AGNPS model to estimate watershed pollutant losses; (2) annualization of AGNPS results to produce annual lake pollutant loadings; (3) a baseflow separation package, SAM, to estimate baseflow; (4) estimates of nutrients in baseflow and point sources; and (5) linkage of watershed loadings directly to EUTROMOD lake water quality algorithms. Results are presented for Melvern Lake, a 28-km(2) multipurpose reservoir with a 900-km(2) agricultural watershed in east central Kansas. Reasonable estimates of current lake quality were attained using an average phosphorus availability factor of 31 percent to calibrate model results to measured in-lake phosphorus. Comparison of a range of possible scenarios, including all cropland changed to no-till (best case) and all CRP and good-condition grasslands changed to cropland (worst case), indicated only a (4 percent change for in-lake phosphorus and a (2 percent change for chlorophyll a. These results indicated that this watershed is not sensitive to projected changes in land use and management.
引用
收藏
页码:1069 / 1080
页数:12
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