Estimation of nitrate load from septic systems to surface water bodies using an ArcGIS-based software View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2013-02-16

AUTHORS

Liying Wang, Ming Ye, J. Fernando Rios, Raoul Fernandes, Paul Z. Lee, Richard W. Hicks

ABSTRACT

Nitrate, as a commonly identified groundwater and surface water pollutant, poses serious threats to human health and the environment. One important source of nitrate in the environment is due to wastewater treatment using Onsite Sewage Treatment and Disposal Systems (OSTDS) (a.k.a., septic systems). To facilitate water resources and environmental management, an ArcGIS-Based Nitrate Load Estimation Toolkit (ArcNLET) is developed to simulate nitrate transport and estimate nitrate load from septic systems and collocated fertilizer applications in groundwater to surface water bodies. It is a screening tool based on a simplified conceptual model of groundwater flow and nitrate transport. It is used in this study to estimate nitrate load from thousands of septic systems to surface water bodies in two neighborhoods located in Jacksonville, FL, USA, where nitrate due to septic systems is believed to be one of the reasons of nutrient enrichment and an isotope study indicates that denitrification is significant. A global sensitivity analysis is performed to identify critical parameters for model calibration, and the most critical parameter is the first-order decay coefficient used to simulate the denitrification process. Hydraulic conductivities at different soil zones have different levels of influence on simulated nitrate concentrations at different locations. By manually adjusting model parameters, simulated shapes of water table and nitrate concentration agree reasonably with average field observations, suggesting that ArcNLET is able to simulate spatial variability of field observations. Estimated nitrate loads exhibit spatial variability, which is useful to facilitate decisions on the conversion of OSTDS into sewers in certain areas for reducing nitrate load from septic systems to surface water bodies. More... »

PAGES

1911-1926

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s12665-013-2283-5

DOI

http://dx.doi.org/10.1007/s12665-013-2283-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1040427287


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