• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of the American Water Resources Association >MODEL-BASED NITROGEN AND PHOSPHORUS (NUTRIENT) CRITERIA FOR LARGE TEMPERATE RIVERS: 2. CRITERIA DERIVATION
【24h】

MODEL-BASED NITROGEN AND PHOSPHORUS (NUTRIENT) CRITERIA FOR LARGE TEMPERATE RIVERS: 2. CRITERIA DERIVATION

机译：大温带河流的基于模型的氮和磷（营养）准则：2.准则推导

获取原文
获取原文并翻译 | 示例
       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Nitrogen and phosphorus criteria were developed for 233km of the Yellowstone River, one of the first cases where a mechanistic model has been used to derive large river numeric nutrient criteria. A water quality model and a companion model which simulates lateral algal biomass across transects were used to simulate effects of increasing nutrients on five variables (dissolved oxygen, total organic carbon, total dissolved gas, pH, and benthic algal biomass in depths 1m). Incremental increases in nutrients were evaluated relative to their impact on predefined thresholds for each variable; the first variable to exceed a threshold set the nutrient criteria. Simulations were made at a low flow, the 14Q5 (lowest average 14 consecutive day flow, July-September, recurring one in five years), which was derived using benthic algae growth curves and EPA guidance on excursion frequency. An extant climate dataset with an annual recurrence was used, and tributary water quality and flows were coincident with the river's 10 lowest flow years. The river had different sensitivities to nutrients longitudinally, pH being the most sensitive variable in the upstream reach and algal biomass in the lower. Model-based criteria for the Yellowstone River are as follows: between the Bighorn and Powder river confluences, 55g TP/l and 655g TN/l; from the Powder River confluence to Montana state line, 95g TP/l and 815g TN/l. Pros and cons of using steady-state models to derive river nutrient criteria are discussed.
机译：在黄石河233公里处制定了氮和磷标准，这是最早使用机械模型得出大型河流数字营养标准的案例之一。使用水质模型和模拟横断面横向藻类生物质的伴生模型来模拟养分增加对五个变量（深度1m处的溶解氧，总有机碳，总溶解气体，pH和底栖藻类生物质）的影响。相对于每个变量对预定阈值的影响，评估了营养素的增量增加；第一个超过阈值的变量设置营养标准。模拟是在低流量，14Q5（7月至9月，连续14天的最低平均流量）中进行的，该流量使用底栖藻类生长曲线和EPA关于漂移频率的指导得出。使用了一个现有的，具有年度重复性的气候数据集，支流水质和流量与该河流的10个最低流量年份相吻合。这条河沿纵向对养分的敏感性不同，pH值是上游河段中最敏感的变量，藻类生物量在下游。黄石河的基于模型的标准如下：在比格霍恩河和粉河合流处，TP / l为55g，TN / l为655g。从粉河汇合处到蒙大拿州线，分别为95g TP / l和815g TN / l。讨论了使用稳态模型得出河流养分标准的利弊。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号