Chamberlin C, Ten Brink M, Munson K, Le A, Detenbeck N
Oak Ridge Institute for Science and Education, U.S. Environmental Protection Agency, Narragansett, Rhode Island, USA.
Atlantic Coastal Environmental Sciences Division, U.S. Environmental Protection Agency, Narragansett, Rhode Island, USA.
J Am Water Resour Assoc. 2023 Feb;59(1):178-196. doi: 10.1111/1752-1688.13070.
Excess loading of nitrogen and phosphorus to river networks causes environmental harm, but reducing loads from large river basins is difficult and expensive. We develop a new tool, the River Basin Export Reduction Optimization Support Tool (RBEROST) to identify least-cost combinations of management practices that will reduce nutrient loading to target levels in downstream and mid-network waterbodies. We demonstrate the utility of the tool in a case study in the Upper Connecticut River basin in New England, USA. The total project cost of optimized lowest-cost plans ranged from $18.0 million to $41.0 million per year over 15 years depending on user specifications. Plans include both point source and non-point source management practices, and most costs are associated with urban stormwater practices. Adding a 2% margin of safety to loading targets improved estimated probability of success from 37.5% to 99%. The large spatial scale of RBEROST, and the consideration of both point and non-point source contributions of nutrients, makes it well suited as an initial screening tool in watershed planning.
向河网过量输入氮和磷会造成环境危害，但减少大型流域的输入量既困难又昂贵。我们开发了一种新工具——流域减排优化支持工具（RBEROST），以确定管理措施的最低成本组合，从而将下游和河网中部水体的养分输入量降至目标水平。我们在美国新英格兰地区的康涅狄格河上游流域的一个案例研究中展示了该工具的实用性。根据用户的具体要求，优化后的最低成本计划的总项目成本在15年内每年为1800万美元至4100万美元不等。这些计划包括点源和非点源管理措施，且大部分成本与城市雨水管理措施有关。将安全边际提高2%可使成功概率估计值从37.5%提高到99%。RBEROST的大空间尺度以及对养分点源和非点源贡献的考虑，使其非常适合作为流域规划中的初始筛选工具。
