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首页> 外文期刊>Transactions of the ASABE >Evaluation and spatially distributed analyses of proposed cost-effective BMPs for reducing phosphorous level in Cedar Creek reservoir, Texas. (Special Issue: Soil and water assessment tool (SWAT) modeling technology: current status.)
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Evaluation and spatially distributed analyses of proposed cost-effective BMPs for reducing phosphorous level in Cedar Creek reservoir, Texas. (Special Issue: Soil and water assessment tool (SWAT) modeling technology: current status.)

机译：对德克萨斯州锡达河水库中降低磷含量的具有成本效益的BMP的评估和空间分布分析。 （特刊：水土评估工具（SWAT）建模技术：当前状态。）

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摘要

The assessment of BMP (best management practice) impacts using a watershed model has helped to establish a watershed conservation and protection plan that is projected to be required by government and decision makers. Cedar Creek watershed, located southeast of Dallas, Texas, was included in the 303(d) list as an impaired watershed due to high pH values. A number of efforts have been made to develop watershed protection plans by the North Central Texas Water Quality (NCTXWQ) project team. Tarrant Region Water District (TRWD) has monitored the water quality in the reservoir and found that chlorophyll-a has been increasing at an annual rate of 3.85%. Chlorophyll-a is a good indicator of algae growth, and TRWD, with 18 years of monitoring, revealed that the increase of chlorophyll-a needs to be a primary focus of the watershed protection plan. A stakeholder group and the project team suggested that total phosphorous (TP) reduction from the watershed should be targeted at 35% of current loading in order to preserve the water quality in the reservoir. In previous studies, flow and nutrients in the watershed were calibrated using SWAT (Soil and Water Assessment Tool). In addition, sensitivity analyses for each BMP were conducted such that each BMP was simulated in the model at a 100% adoption rate. The cost-effectiveness of each BMP was estimated and ranked by TP reduction. In this study, using the calibrated model and the cost-effectiveness analyses of the BMPs, the initially selected BMPs were simulated in SWAT to identify the reduction rate at the watershed outlet (reservoir) using a marginal adoption rate and to illustrate the spatially distributed impacts of each BMP at the subbasin scale. The results show that simulation of the eight selected BMPs in subbasins with higher TP loading can achieve the 35% reduction goal at the reservoir.
机译：使用分水岭模型对BMP（最佳管理实践）的影响进行评估有助于建立分水岭的保护和保护计划，预计政府和决策者将需要该计划。位于德克萨斯州达拉斯东南的雪松溪流域由于pH值高而被列为303（d）受损流域。北德克萨斯中部水质（NCTXWQ）项目团队已做出许多努力来制定流域保护计划。塔兰特地区水区（TRWD）监测了水库中的水质，发现叶绿素a的年增长率为3.85％。叶绿素-a是藻类生长的良好指标，TRWD经过18年的监测发现，叶绿素-a的增加需要成为流域保护计划的主要重点。一个利益相关者团体和项目团队建议，流域的总磷（TP）减少量应以当前负荷的35％为目标，以保持水库中的水质。在先前的研究中，使用SWAT（土壤和水评估工具）对流域中的流量和养分进行了校准。此外，还对每个BMP进行了敏感性分析，以使模型中每个BMP的采用率为100％。估计每个BMP的成本效益，并按TP降低进行排名。在这项研究中，使用BMP的校准模型和成本效益分析，在SWAT中模拟了最初选择的BMP，以使用边际采用率确定流域出口（水库）的减少率，并说明空间分布的影响子盆地规模的每个BMP的数量。结果表明，对TP负荷较高的子流域中选定的8个BMP进行模拟可以达到35％的降低目标。

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