使用高频监测数据量化全市悬浮沉积物负载并评估TMDL目标
Samuel A Miller1, James S Webber2, John D Jastram2
1U.S. Geological Survey, Virginia and West Virginia Water Science Center, 1730 East Parham Road, Richmond, VA, 23228, USA. smiller@usgs.gov.
Environmental monitoring and assessment
|October 25, 2023
概括
来自城市地区的过度沉积物负载 (SSL) 显著超过总最大每日负载 (TMDL) 目标. 高频监测显示,大型风暴事件是这些超标的主要驱动因素,强调需要改进TMDL评估.
科学领域:
- 环境科学 环境科学
- 水资源管理 水资源管理
- 生态生态学 生态生态学
背景情况:
- 过多的沉积物是美国水体损坏的主要原因,导致昂贵的最大每日负荷总量 (TMDL).
- 市政府大量投资于管理实践,以减少悬浮沉积物负载 (SSL),但监测数据往往未得到充分利用,以跟踪进展.
研究的目的:
- 建立一个监测网络来量化从罗安诺克市 (CoR) 到罗安诺克河和Tinker Creek的SSL.
- 为指导城市流域的总最大每日负载 (TMDL) 评估和实施.
主要方法:
- 利用了2020年至2022年期间收集的高频度数据.
- 开发了替代线性回归模型来估计悬浮沉积物度.
- 量化SSL并将其与TMDL分配进行比较.
主要成果:
- 三年的SSL中有61%是由于仅有五次大型风暴事件.
- 来自COR的悬浮沉积物的平均产量几乎是TMDL分配的五倍.
- 大型风暴事件后的SSL是年度分配负载的两倍.
结论:
- 高频监测对于准确的SSL估计和有效的TMDL评估在城市环境中至关重要.
- 基于森林流域的TMDL目标可能对高度透的城市地区不切实际.
- 当前的TMDL模型在闪亮的城市风暴事件中可能无法充分捕获SSL.
相关概念视频
Design Example: Analyzing Capacity Contours for Flood Risk Assessment
52
Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
52
Conservation of Mass in Moving, Nondeforming Control Volume
1.1K
Stormwater detention basins are essential in managing runoff during heavy rainfall, particularly in urban areas where impervious surfaces increase the risk of flooding. Understanding the conservation of mass in these systems allows engineers to optimize basin performance, balancing inflow, outflow, and water storage.
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
1.1K
Typical Model Studies
365
Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
365


