Son Ji-Hee, Goodwin Stephen, Carlson Kenneth
Water Environ Res. 2015 Feb;87(2):169-78. doi: 10.2175/106143014x14062131179393.
The objectives of this study were to monitor total phosphorus concentrations and loads along the Cache la Poudre River in Northern Colorado as it flows from a pristine area through urban regions and, finally, through mixed land uses. The study attempted to evaluate the sources and influences of total phosphorus under different hydrologic conditions. Nine sampling events were completed from April 2010 to May 2011 to assess the influence of various hydrologic conditions on aqueous and riverbed sediment total phosphorus concentrations. Total phosphorus concentrations and loads exceeded the in-stream limits proposed by the Colorado Department of Public Health and Environment in all observed hydrologic conditions, and nonpoint sources were significant in high-flow conditions. Reducing nutrients only at water resource recovery facilities (WRRFs) could not achieve the in-stream limits without substantial reduction of non-point-source loads. The study exposed a need for flexibility in WRRF discharge limits based on the overall total phosphorus load in the river from other sources.
本研究的目的是监测科罗拉多州北部卡什拉普德雷河沿线的总磷浓度和负荷，该河流从一个原始地区流经城市区域，最终流经混合土地利用区域。该研究试图评估不同水文条件下总磷的来源和影响。从2010年4月到2011年5月完成了九次采样活动，以评估各种水文条件对水体和河床沉积物总磷浓度的影响。在所有观测到的水文条件下，总磷浓度和负荷均超过了科罗拉多州公共卫生与环境部提出的河流内限值，并且在高流量条件下非点源污染显著。仅在水资源回收设施（WRRFs）处减少营养物质，在不大量减少非点源负荷的情况下无法达到河流内限值。该研究表明，基于河流中来自其他来源的总磷负荷总量，需要灵活设定WRRF排放限值。
