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GroMoPo Metadata for Nassau County SEAWAT model

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Created: Feb 06, 2023 at 9:01 p.m.
Last updated: Feb 06, 2023 at 9:01 p.m.
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A methodology is proposed to define indices for quantifying risks under the threat of reducing in groundwater levels, the existence of saltwater intrusion (SWI), and an increasing nitrate contamination load in submarine groundwater discharge (SGD). The proposed methodology considers coastal regions under geological heterogeneity and it is tested on a groundwater system in Nassau County of Long Island, New York (USA). The numerical model is constructed with the SEAWAT code. The parameter uncertainty of this model is evaluated by coupling the Latin hypercube sampling method (as a sampling algorithm) and Monte Carlo simulation to consider the uncertainty in both hydraulic conductivity and recharge rate. The indices are presented in spatial maps that classify areas of risk to potential threats. The results show that two of the water districts have a high risk under conditions of decreasing groundwater level. Salinity occurs in the southern and southwestern parts of the Nassau County aquifer and a considerable area of high risk of SWI is identified. Furthermore, the average SGD rate with the associated fluxes of nitrate is estimated as 81.4 million m(3)/year (average 0.8 tons of nitrate through SGD per year), which can adversely affect the quality of life in the local coastal ecosystems. The framework developed in this study could help the water district managers to identify high-risk areas for short-term and long-term planning and is applicable to other coastal settings.

Subject Keywords



Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
Place/Area Name:
United States
North Latitude
East Longitude
South Latitude
West Longitude


Additional Metadata

Name Value
DOI 10.1007/s10040-020-02197-9
Depth 500
Scale < 1000 km²
Layers 11-15 layers
Purpose groundwater resources;scientific investigation;salt water intrusion
GroMoPo_ID 25
IsVerified True
Model Code SEAWAT
Model Link
Model Time 2000-2018
Model Year 2020
Model Authors Mohammad Karamouz, Davood Mahmoodzadeh, Gualbert H. P. Oude Essink
Model Country United States
Data Available report/paper only;Geological input available;a 3D geological schematization in the article
Developer Email
Dominant Geology unconsolidated
Developer Country Iran
Publication Title A risk-based groundwater modeling framework in coastal aquifers: a case study on Long Island, New York, USA
Original Developer No
Additional Information
Integration or Coupling Solute transport
Evaluation or Calibration static water levels;contaminant concentrations
Geologic Data Availability

How to Cite

GroMoPo, D. Zamrsky (2023). GroMoPo Metadata for Nassau County SEAWAT model, HydroShare,

This resource is shared under the Creative Commons Attribution CC BY.


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