Hydrogeology and hydrologic conditions of the Northern Atlantic Coastal Plain aquifer System from Long Island, New York, to North Carolina

Masterson, John P.; Pope, Jason P.; Monti, Jack; Nardi, Mark R.; Finkelstein, Jason S.; McCoy, Kurt J.

doi:10.3133/sir20135133

Cited by 21 publications

(11 citation statements)

References 21 publications

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“…All the aforementioned works assume that the aquifer (or aquifer system) has a constant thickness. This hypothesis is not always valid because nonuniformity in aquifer thickness is commonly reported (Rotzoll et al 2013;Masterson et al 2015). Hantush (1962a) developed an approximate theory to describe water flow in aquifers of varying thickness showing that the effect of heterogeneity could be significant.…”

Section: Introductionmentioning

confidence: 99%

Groundwater response to tidal fluctuations in wedge-shaped confined aquifers

2017

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Most of the analytical solutions to describe tideinduced head fluctuations assume that the coastal aquifer has a constant thickness. These solutions have been applied in many practical problems ignoring possible changes in aquifer thickness, which may lead to wrong estimates of the hydraulic parameters. In this study, a new analytical solution to describe tide-induced head fluctuations in a wedge-shaped coastal aquifer is presented. The proposed model assumes that the aquifer thickness decreases with the distance from the coastline. A closed-form analytical solution is obtained by solving a boundary-value problem with both a separation of variables method and a change of variables method. The analytical solution indicates that wedging significantly enhances the amplitude of the induced heads in the aquifer. However, the effect on time lag is almost negligible, particularly near the coast. The slope factor, which quantifies the degree of heterogeneity of the aquifer, is obtained and analyzed for a number of hypothetical scenarios. The slope factor provides a simple criterion to detect a possible wedging of the coastal aquifer.

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Section: Introductionmentioning

confidence: 99%

Groundwater response to tidal fluctuations in wedge-shaped confined aquifers

2017

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“…Census Bureau, 2016). The region relies heavily on the Potomac Aquifer system, which supplies approximately 75% of the groundwater withdrawn (Masterson et al, 2015). This region has seen the highest rates of land subsidence on the east coast of the United States, with a decline in elevation of 1.1-4.8 mm/year on average since the 1940s (Eggleston & Pope, 2013).…”

Section: Methodsmentioning

confidence: 99%

Policy Targeting to Reduce Economic Damages From Land Subsidence

Wade

Cobourn

Amacher

et al. 2018

Water Resources Research

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Groundwater pumping contributes significantly to land subsidence, which generates economic costs as changes in the frequency of flooding affect property values. We evaluate these costs by estimating the marginal damages from pumping, which define the corrective policy incentive to address land subsidence externalities. In an application to the southern Chesapeake Bay region of Virginia, we find that land subsidence due to groundwater pumping is greatest in inland rural areas, but that the damages from pumping are greatest in coastal urban areas. Our results suggest that cost‐minimizing groundwater policy is spatially heterogeneous and targets the damages from land subsidence due to pumping in different locations, not simply physical land subsidence itself. These results are driven by differences in the spatial patterns of aquifer characteristics, which determine subsidence, and housing density, which determines the damages from subsidence.

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“…Groundwater recharge is estimated on a daily basis as the difference between sources and sinks of water, and the change in soil moisture. The SWB groundwater recharge model has been used in several regional groundwater studies in the United States including the Northern Atlantic Coastal Plain Aquifer System (Masterson et al ), the Lake Michigan Basin (Feinstein et al ), basins in Wisconsin (Dripps and Bradbury ) and Minnesota (Smith and Westenbroek ), and the High Plains Aquifer (Stanton et al ). Annual recharge simulated during the 1951 to 2015 historical time period by the SWB over the same UCRB area as the Geldon's () study is 9.1 and 8.6 km 3 (mean and median annual values), representing 11% and 6% differences, respectively, with the Geldon's () estimate.…”

Section: Methods and Datamentioning

confidence: 99%

Changes in Projected Spatial and Seasonal Groundwater Recharge in the Upper Colorado River Basin

Tillman¹,

Gangopadhyay

Pruitt

2017

Groundwater

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The Colorado River is an important source of water in the western United States, supplying the needs of more than 38 million people in the United States and Mexico. Groundwater discharge to streams has been shown to be a critical component of streamflow in the Upper Colorado River Basin (UCRB), particularly during low-flow periods. Understanding impacts on groundwater in the basin from projected climate change will assist water managers in the region in planning for potential changes in the river and groundwater system. A previous study on changes in basin-wide groundwater recharge in the UCRB under projected climate change found substantial increases in temperature, moderate increases in precipitation, and mostly periods of stable or slight increases in simulated groundwater recharge through 2099. This study quantifies projected spatial and seasonal changes in groundwater recharge within the UCRB from recent historical (1950 to 2015) through future (2016 to 2099) time periods, using a distributed-parameter groundwater recharge model with downscaled climate data from 97 Coupled Model Intercomparison Project Phase 5 (CMIP5) climate projections. Simulation results indicate that projected increases in basin-wide recharge of up to 15% are not distributed uniformly within the basin or throughout the year. Northernmost subregions within the UCRB are projected an increase in groundwater recharge, while recharge in other mainly southern subregions will decline. Seasonal changes in recharge also are projected within the UCRB, with decreases of 50% or more in summer months and increases of 50% or more in winter months for all subregions, and increases of 10% or more in spring months for many subregions.

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Hydrogeology and hydrologic conditions of the Northern Atlantic Coastal Plain aquifer System from Long Island, New York, to North Carolina

Cited by 21 publications

References 21 publications

Groundwater response to tidal fluctuations in wedge-shaped confined aquifers

Groundwater response to tidal fluctuations in wedge-shaped confined aquifers

Policy Targeting to Reduce Economic Damages From Land Subsidence

Changes in Projected Spatial and Seasonal Groundwater Recharge in the Upper Colorado River Basin

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