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Journal of the American Water Resources Association

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https://www.readbyqxmd.com/read/26380545/assessing-the-potential-effects-of-fungicides-on-nontarget-gut-fungi-trichomycetes-and-their-associated-larval-black-fly-hosts
#1
Emma R Wilson, Kelly L Smalling, Timothy J Reilly, Elmer Gray, Laura Bond, Lance Steele, Prasanna Kandel, Alison Chamberlin, Justin Gause, Nicole Reynolds, Ian Robertson, Stephen Novak, Kevin Feris, Merlin M White
Fungicides are moderately hydrophobic and have been detected in water and sediment, particularly in agricultural watersheds, but typically are not included in routine water quality monitoring efforts. This is despite their widespread use and frequent application to combat fungal pathogens. Whereas the efficacy of these compounds on fungal pathogens is well documented, little is known about their effects on nontarget fungi. This pilot study, a field survey in southwestern Idaho from April to December 2010 on four streams with varying pesticide inputs (two agricultural and two reference sites), was conducted to assess nontarget impact of fungicides on gut fungi, or trichomycetes...
April 1, 2014: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457586/the-regionalization-of-national-scale-sparrow-models-for-stream-nutrients
#2
Gregory E Schwarz, Richard B Alexander, Richard A Smith, Stephen D Preston
This analysis modifies the parsimonious specification of recently published total nitrogen (TN) and total phosphorus (TP) national-scale SPAtially Referenced Regressions On Watershed attributes models to allow each model coefficient to vary geographically among three major river basins of the conterminous United States. Regionalization of the national models reduces the standard errors in the prediction of TN and TP loads, expressed as a percentage of the predicted load, by about 6 and 7%. We develop and apply a method for combining national-scale and regional-scale information to estimate a hybrid model that imposes cross-region constraints that limit regional variation in model coefficients, effectively reducing the number of free model parameters as compared to a collection of independent regional models...
October 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457585/a-web-based-decision-support-system-for-assessing-regional-water-quality-conditions-and-management-actions
#3
Nathaniel L Booth, Eric J Everman, I-Lin Kuo, Lori Sprague, Lorraine Murphy
The U.S. Geological Survey National Water Quality Assessment Program has completed a number of water-quality prediction models for nitrogen and phosphorus for the conterminous United States as well as for regional areas of the nation. In addition to estimating water-quality conditions at unmonitored streams, the calibrated SPAtially Referenced Regressions On Watershed attributes (SPARROW) models can be used to produce estimates of yield, flow-weighted concentration, or load of constituents in water under various land-use condition, change, or resource management scenarios...
October 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457584/surface-water-nutrient-conditions-and-sources-in-the-united-states-pacific-northwest
#4
Daniel R Wise, Henry M Johnson
The SPAtially Referenced Regressions On Watershed attributes (SPARROW) model was used to perform an assessment of surface-water nutrient conditions and to identify important nutrient sources in watersheds of the Pacific Northwest region of the United States (U.S.) for the year 2002. Our models included variables representing nutrient sources as well as landscape characteristics that affect nutrient delivery to streams. Annual nutrient yields were higher in watersheds on the wetter, west side of the Cascade Range compared to watersheds on the drier, east side...
October 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457583/modeled-sources-transport-and-accumulation-of-dissolved-solids-in-water-resources-of-the-southwestern-united-states
#5
David W Anning
Information on important source areas for dissolved solids in streams of the southwestern United States, the relative share of deliveries of dissolved solids to streams from natural and human sources, and the potential for salt accumulation in soil or groundwater was developed using a SPAtially Referenced Regressions On Watershed attributes model. Predicted area-normalized reach-catchment delivery rates of dissolved solids to streams ranged from <10 (kg/year)/km(2) for catchments with little or no natural or human-related solute sources in them to 563,000 (kg/year)/km(2) for catchments that were almost entirely cultivated land...
October 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457582/sources-and-delivery-of-nutrients-to-the-northwestern-gulf-of-mexico-from-streams-in-the-south-central-united-states
#6
Richard A Rebich, Natalie A Houston, Scott V Mize, Daniel K Pearson, Patricia B Ging, C Evan Hornig
SPAtially Referenced Regressions On Watershed attributes (SPARROW) models were developed to estimate nutrient inputs [total nitrogen (TN) and total phosphorus (TP)] to the northwestern part of the Gulf of Mexico from streams in the South-Central United States (U.S.). This area included drainages of the Lower Mississippi, Arkansas-White-Red, and Texas-Gulf hydrologic regions. The models were standardized to reflect nutrient sources and stream conditions during 2002. Model predictions of nutrient loads (mass per time) and yields (mass per area per time) generally were greatest in streams in the eastern part of the region and along reaches near the Texas and Louisiana shoreline...
October 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457581/nutrient-sources-and-transport-in-the-missouri-river-basin-with-emphasis-on-the-effects-of-irrigation-and-reservoirs
#7
Juliane B Brown, Lori A Sprague, Jean A Dupree
SPAtially Referenced Regressions On Watershed attributes (SPARROW) models were used to relate instream nutrient loads to sources and factors influencing the transport of nutrients in the Missouri River Basin. Agricultural inputs from fertilizer and manure were the largest nutrient sources throughout a large part of the basin, although atmospheric and urban inputs were important sources in some areas. Sediment mobilized from stream channels was a source of phosphorus in medium and larger streams. Irrigation on agricultural land was estimated to decrease the nitrogen load reaching the Mississippi River by as much as 17%, likely as a result of increased anoxia and denitrification in the soil zone...
October 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457580/nutrient-inputs-to-the-laurentian-great-lakes-by-source-and-watershed-estimated-using-sparrow-watershed-models
#8
Dale M Robertson, David A Saad
Nutrient input to the Laurentian Great Lakes continues to cause problems with eutrophication. To reduce the extent and severity of these problems, target nutrient loads were established and Total Maximum Daily Loads are being developed for many tributaries. Without detailed loading information it is difficult to determine if the targets are being met and how to prioritize rehabilitation efforts. To help address these issues, SPAtially Referenced Regressions On Watershed attributes (SPARROW) models were developed for estimating loads and sources of phosphorus (P) and nitrogen (N) from the United States (U...
October 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457579/a-regional-modeling-framework-of-phosphorus-sources-and-transport-in-streams-of-the-southeastern-united-states
#9
Ana María García, Anne B Hoos, Silvia Terziotti
We applied the SPARROW model to estimate phosphorus transport from catchments to stream reaches and subsequent delivery to major receiving water bodies in the Southeastern United States (U.S.). We show that six source variables and five land-to-water transport variables are significant (p<0.05) in explaining 67% of the variability in long-term log-transformed mean annual phosphorus yields. Three land-to-water variables are a subset of landscape characteristics that have been used as transport factors in phosphorus indices developed by state agencies and are identified through experimental research as influencing land-to-water phosphorus transport at field and plot scales...
October 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457578/source-and-delivery-of-nutrients-to-receiving-waters-in-the-northeastern-and-mid-atlantic-regions-of-the-united-states
#10
Richard B Moore, Craig M Johnston, Richard A Smith, Bryan Milstead
This study investigates nutrient sources and transport to receiving waters, in order to provide spatially detailed information to aid water-resources managers concerned with eutrophication and nutrient management strategies. SPAtially Referenced Regressions On Watershed attributes (SPARROW) nutrient models were developed for the Northeastern and Mid-Atlantic (NE US) regions of the United States to represent source conditions for the year 2002. The model developed to examine the source and delivery of nitrogen to the estuaries of nine large rivers along the NE US Seaboard indicated that agricultural sources contribute the largest percentage (37%) of the total nitrogen load delivered to the estuaries...
October 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457577/nutrient-loadings-to-streams-of-the-continental-united-states-from-municipal-and-industrial-effluent
#11
Molly A Maupin, Tamara Ivahnenko
Data from the United States Environmental Protection Agency Permit Compliance System national database were used to calculate annual total nitrogen (TN) and total phosphorus (TP) loads to surface waters from municipal and industrial facilities in six major regions of the United States for 1992, 1997, and 2002. Concentration and effluent flow data were examined for approximately 118,250 facilities in 45 states and the District of Columbia. Inconsistent and incomplete discharge locations, effluent flows, and effluent nutrient concentrations limited the use of these data for calculating nutrient loads...
October 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457576/a-multi-agency-nutrient-dataset-used-to-estimate-loads-improve-monitoring-design-and-calibrate-regional-nutrient-sparrow-models
#12
David A Saad, Gregory E Schwarz, Dale M Robertson, Nathaniel L Booth
Stream-loading information was compiled from federal, state, and local agencies, and selected universities as part of an effort to develop regional SPAtially Referenced Regressions On Watershed attributes (SPARROW) models to help describe the distribution, sources, and transport of nutrients in streams throughout much of the United States. After screening, 2,739 sites, sampled by 73 agencies, were identified as having suitable data for calculating long-term mean annual nutrient loads required for SPARROW model calibration...
October 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457575/digital-hydrologic-networks-supporting-applications-related-to-spatially-referenced-regression-modeling
#13
Jw Brakebill, Dm Wolock, Se Terziotti
Digital hydrologic networks depicting surface-water pathways and their associated drainage catchments provide a key component to hydrologic analysis and modeling. Collectively, they form common spatial units that can be used to frame the descriptions of aquatic and watershed processes. In addition, they provide the ability to simulate and route the movement of water and associated constituents throughout the landscape. Digital hydrologic networks have evolved from derivatives of mapping products to detailed, interconnected, spatially referenced networks of water pathways, drainage areas, and stream and watershed characteristics...
October 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457574/factors-affecting-stream-nutrient-loads-a-synthesis-of-regional-sparrow-model-results-for-the-continental-united-states
#14
Stephen D Preston, Richard B Alexander, Gregory E Schwarz, Charles G Crawford
We compared the results of 12 recently calibrated regional SPARROW (SPAtially Referenced Regressions On Watershed attributes) models covering most of the continental United States to evaluate the consistency and regional differences in factors affecting stream nutrient loads. The models - 6 for total nitrogen and 6 for total phosphorus - all provide similar levels of prediction accuracy, but those for major river basins in the eastern half of the country were somewhat more accurate. The models simulate long-term mean annual stream nutrient loads as a function of a wide range of known sources and climatic (precipitation, temperature), landscape (e...
October 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457573/sparrow-modeling-to-understand-water-quality-conditions-in-major-regions-of-the-united-states-a-featured-collection-introduction
#15
Stephen D Preston, Richard B Alexander, David M Wolock
No abstract text is available yet for this article.
October 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457572/the-impacts-of-water-conservation-strategies-on-water-use-four-case-studies
#16
Yushiou Tsai, Sara Cohen, Richard M Vogel
We assessed impacts on water use achieved by implementation of controlled experiments relating to four water conservation strategies in four towns within the Ipswich watershed in Massachusetts. The strategies included (1) installation of weather-sensitive irrigation controller switches (WSICS) in residences and municipal athletic fields; (2) installation of rainwater harvesting systems in residences; (3) two outreach programs: (a) free home indoor water use audits and water fixture retrofit kits and (b) rebates for low-water-demand toilets and washing machines; and (4) soil amendments to improve soil moisture retention at a municipal athletic field...
August 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457571/modeling-the-potential-impact-of-seasonal-and-inactive-multi-aquifer-wells-on-contaminant-movement-to-public-water-supply-wells
#17
Rl Johnson, Br Clark, Mk Landon, Lj Kauffman, Sm Eberts
Wells screened across multiple aquifers can provide pathways for the movement of surprisingly large volumes of groundwater to confined aquifers used for public water supply (PWS). Using a simple numerical model, we examine the impact of several pumping scenarios on leakage from an unconfined aquifer to a confined aquifer and conclude that a single inactive multi-aquifer well can contribute nearly 10% of total PWS well flow over a wide range of pumping rates. This leakage can occur even when the multi-aquifer well is more than a kilometer from the PWS well...
June 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457570/trends-in-pesticide-concentrations-in-streams-of-the-western-united-states-1993-2005
#18
Henry M Johnson, Joseph L Domagalski, Dina K Saleh
Trends in pesticide concentrations for 15 streams in California, Oregon, Washington, and Idaho were determined for the organophosphate insecticides chlorpyrifos and diazinon and the herbicides atrazine, s-ethyl diproplythiocarbamate (EPTC), metolachlor, simazine, and trifluralin. A parametric regression model was used to account for flow, seasonality, and antecedent hydrologic conditions and thereby estimate trends in pesticide concentrations in streams arising from changes in use amount and application method in their associated catchments...
April 2011: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/22457569/weighted-regressions-on-time-discharge-and-season-wrtds-with-an-application-to-chesapeake-bay-river-inputs
#19
Robert M Hirsch, Douglas L Moyer, Stacey A Archfield
A new approach to the analysis of long-term surface water-quality data is proposed and implemented. The goal of this approach is to increase the amount of information that is extracted from the types of rich water-quality datasets that now exist. The method is formulated to allow for maximum flexibility in representations of the long-term trend, seasonal components, and discharge-related components of the behavior of the water-quality variable of interest. It is designed to provide internally consistent estimates of the actual history of concentrations and fluxes as well as histories that eliminate the influence of year-to-year variations in streamflow...
October 2010: Journal of the American Water Resources Association
https://www.readbyqxmd.com/read/21072249/tracking-cholera-in-coastal-regions-using-satellite-observations
#20
Antarpreet S Jutla, Ali S Akanda, Shafiqul Islam
Cholera remains a significant health threat across the globe. The pattern and magnitude of the seven global pandemics suggest that cholera outbreaks primarily originate in coastal regions and then spread inland through secondary means. Cholera bacteria show strong association with plankton abundance in coastal ecosystems. This review study investigates relationship(s) between cholera incidence and coastal processes and explores utility of using remote sensing data to track coastal plankton blooms, using chlorophyll as a surrogate variable for plankton abundance, and subsequent cholera outbreaks...
August 2010: Journal of the American Water Resources Association
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