基于迈阿密-戴德城市地下水模型的化粪池回流路径线、终点和流量。

Ground water Pub Date : 2024-11-01 Epub Date: 2024-08-07 DOI:10.1111/gwat.13435
Miguel E Valencia, Michael C Sukop, Grace Oldfield, Angela Montoya, Virginia Walsh, Jayantha Obeysekera, Samantha Barquin, Elizabeth Kelly, Katherine Hagemann, Aliza Karim, Oscar F Guzman
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引用次数: 0

摘要

迈阿密-戴德县 (MDC) 有超过 112,000 个化粪池系统,其中一些系统因海平面上升导致地下水位上升而面临损坏的风险。迈阿密-戴德县周围有包括比斯坎湾在内的受保护水体和环境敏感的生态系统,其地下为高透水性喀斯特石灰岩。这项研究的主要目的是提供化粪池回流到排放端点的位置和大小的初步估计。要实现这一目标,需要利用 MDC 的县级地表-地下水模型,采用路径线分析法,在地下水流对抽水、运河管理、暴风雨和其他环境因素的反应的复杂时间历史条件下,估算化粪池系统水流的传输和排放命运。该模型覆盖了佛罗里达东南部 4772 平方公里的区域。该模型的输出结果被用于创建从化粪池输入点到终点的 30 年(2010 年至 2040 年)时空路径模拟,使我们能够绘制模拟条件下的流动路径和化粪池流排放终点的空间分布图。大部分粪便回流被排入地表水,主要是运河 52,830 立方米/天、比斯坎湾(5696 立方米/天)和井田(14,066 立方米/天)。这些结果使我们能够确定 "热点",为水质采样工作提供指导,并为化粪池到下水道的转换区域提供建议,这些区域应能通过减少水体的营养负荷而带来最大益处。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Septic Return Flow Pathlines, Endpoints, and Flows Based on the Urban Miami-Dade Groundwater Model.

Miami-Dade County (MDC) has over 112,000 septic systems, some of which are at risk of compromise due to water table rise associated with sea level rise. MDC is surrounded by protected water bodies, including Biscayne Bay, with environmentally sensitive ecosystems and is underlain by highly transmissive karstic limestone. The main objective of the study is to provide first estimates of the locations and magnitudes of septic return flows to discharge endpoints. This is accomplished by leveraging MDC's county-scale surface-groundwater model using pathline analysis to estimate the transport and discharge fate of septic system flows under the complex time history of groundwater flow response to pumping, canal management, storms, and other environmental factors. The model covers an area of 4772 km2 in Southeast Florida. Outputs from the model were used to create a 30-year (2010 to 2040) simulation of the spatial-temporal pathlines from septic input locations to their termination points, allowing us to map flow paths and the spatial distribution of the septic flow discharge endpoints under the simulated conditions. Most septic return flows were discharged to surface water, primarily canals 52,830 m3/d and Biscayne Bay (5696 m3/d), and well fields (14,066 m3/d). Results allow us to identify "hotspots" to guide water quality sampling efforts and to provide recommendations for septic-to-sewer conversion areas that should provide most benefit by reducing nutrient loading to water bodies.

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