Altitude and configuration of the water table, western Cape Cod aquifer, Massachusetts, March 1993

Savoie, Jennifer G.

doi:10.3133/ofr94462

Cited by 13 publications

(19 citation statements)

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“…1) for Waquoit Bay subwatersheds were determined by use of a groundwater-flow model (MODFLOW). For other watersheds, delineations were drawn on the basis of water table-elevation contours from the United States Geological Survey (Savoie 1995) with flow lines perpendicular to the contours. We then overlaid watershed boundaries on aerial photographs or GIS land-use maps (from the Town of Falmouth GIS database) and collated land uses within, including number of residential buildings and coverage by commercial and agricultural land and by wetlands, ponds, and golf courses.…”

Section: Methodsmentioning

confidence: 99%

Groundwater-transported dissolved organic nitrogen exports from coastal watersheds

2006

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We analyzed groundwater-transported nitrogen (N) exports from 41 watershed segments that comprised 10 Cape Cod, Massachusetts watersheds to test the hypotheses that chemical form of N exports is related to land use and to length of flow paths through watersheds. In the absence of human habitation, these glacial outwash-plain watersheds exported largely dissolved organic N (DON) but at relatively low annual rate. Addition of people to watersheds increased rates of both total dissolved N (TDN) and DON export through groundwater. Percent of TDN as DON in groundwater was negatively related to path length of groundwater through aquifers, but %DON was not significantly related to population density on the watersheds. DON was often the dominant form of N exported from the watersheds, even at high population densities. Our results suggest that natural sources are not entirely responsible for organic N exports from watersheds, but, instead, a substantial portion of anthropogenic N introduced to watersheds is exported as DON. This finding is in disagreement with previous results, which suggest that anthropogenic N is exported from watersheds largely as NO 2 3 and that DON exported from watersheds is from natural sources.

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Section: Methodsmentioning

confidence: 99%

Groundwater-transported dissolved organic nitrogen exports from coastal watersheds

2006

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“…In 1994, this study included measurements from 17 of these wells. The altitude of the water table fluctuates as much as 7 ft annually on western Cape Cod because of seasonal variations in aquifer recharge and ground-water pumping (Letty, 1984 (Savoie, 1995). The watertable contours based on the March 1993 water-level measurements, are similar in shape to the outline of the coast ( fig.…”

Section: Hydrologic Systemmentioning

confidence: 66%

“…Flow was measured at a total of 22 locations on 7 streams in the study area as part of the March 1993, synoptic measurements of hydrologic conditions (Savoie, 1995). Although the water-table altitudes measured during March 1993, appear to be similar to long-term average water-table conditions, slight changes in water-table altitudes can result in significant changes in ground-water discharge to streams.…”

Section: Hydrologic Systemmentioning

confidence: 99%

Use of particle tracking to improve numerical model calibration and to analyze ground-water flow and contaminant migration, Massachusetts Military Reservation, western Cape Cod, Massachusetts

1997

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“…To apply NLM to the watersheds, we used aerial photographs and the Town of Falmouth geographic information system (GIS) database to compile areas of each land cover type and number of dwellings within the watershed boundaries (http://coastal.er.usgs.gov). Watershed delineations for Green Pond and West Falmouth Harbor were from the Town of Falmouth GIS database, and delineations were based on water table elevation contour maps produced by the USGS (Savoie 1995). Based on the mosaic of land uses, NLM calculates the N load to the watershed surface from atmospheric deposition, fertilizer use, and waste water disposal through on-site septic systems.…”

Section: Modeled Nitrogen Loads From Watershedsmentioning

confidence: 99%

Nitrogen Loads to Estuaries from Waste Water Plumes: Modeling and Isotopic Approaches

Kroeger¹,

Cole²,

York³

et al. 2005

Groundwater

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We developed, and applied in two sites, novel methods to measure ground water-borne nitrogen loads to receiving estuaries from plumes resulting from land disposal of waste water treatment plant (WWTP) effluent. In addition, we quantified nitrogen losses from WWTP effluent during transport through watersheds. WWTP load to receiving water was estimated as the difference between total measured ground water-transported nitrogen load and modeled load from major nitrogen sources other than the WWTP. To test estimated WWTP loads, we applied two additional methods. First, we quantified total annual waste water nitrogen load from watersheds based on nitrogen stable isotopic signatures of primary producers in receiving water. Second, we used published data on ground water nitrogen concentrations in an array of wells to estimate dimensions of the plume and quantify the annual mass of nitrogen transported within the plume. Loss of nitrogen during transport through the watershed was estimated as the difference between the annual mass of nitrogen applied to watersheds as treatment plant effluent and the estimated nitrogen load reaching receiving water. In one plume, we corroborated our estimated nitrogen loss in watersheds using data from multiple-level sampling wells to calculate the loss of nitrogen relative to a conservative tracer. The results suggest that nitrogen from the plumes is discharging to the estuaries but that substantial nitrogen loss occurs during transport through the watersheds. The measured vs. modeled and stable isotopic approaches, in comparison to the plume mapping approach, may more reliably quantify ground water-transported WWTP loads to estuaries.

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Altitude and configuration of the water table, western Cape Cod aquifer, Massachusetts, March 1993

Cited by 13 publications

References 0 publications

Groundwater-transported dissolved organic nitrogen exports from coastal watersheds

Groundwater-transported dissolved organic nitrogen exports from coastal watersheds

Use of particle tracking to improve numerical model calibration and to analyze ground-water flow and contaminant migration, Massachusetts Military Reservation, western Cape Cod, Massachusetts

Nitrogen Loads to Estuaries from Waste Water Plumes: Modeling and Isotopic Approaches

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