Water quality in the Acadian-Pontchartrain drainages: Louisiana and Mississippi, 1999–2001

Demcheck, Dennis K.; Tollett, Roland W.; Mize, Scott V.; Skrobialowski, Stanley C.; Fendick, Robert B.; Swarzenski, Christopher M.; Porter, Stephen D.

doi:10.3133/cir1232

Cited by 10 publications

(8 citation statements)

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“…, 2008) and for the southeastern U.S. regional SPARROW TN model (hereafter referred to as SE‐TN model, Hoos and McMahon, 2009), and (2) a review of sources and potential delivery mechanisms identified in local studies (e.g., van Metre and Reutter, 1995; Davis and Bell, 1998; Ging, 1999; Coupe, 2002; Haggard et al. , 2003; Demcheck et al. , 2004; Tortorelli, 2008).…”

Section: Methodsmentioning

confidence: 99%

Sources and Delivery of Nutrients to the Northwestern Gulf of Mexico from Streams in the South-Central United States1

Rebich

Houston

Mize

et al. 2011

JAWRA Journal of the American Water Resources Association

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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. The Mississippi River and Atchafalaya River watersheds, which drain nearly two-thirds of the conterminous U.S., delivered the largest nutrient loads to the Gulf of Mexico, as expected. However, the three largest delivered TN yields were from the Trinity River/Galveston Bay, Calcasieu River, and Aransas River watersheds, while the three largest delivered TP yields were from the Calcasieu River, Mermentau River, and Trinity River/Galveston Bay watersheds. Model output indicated that the three largest sources of nitrogen from the region were atmospheric deposition (42%), commercial fertilizer (20%), and livestock manure (unconfined, 17%). The three largest sources of phosphorus were commercial fertilizer (28%), urban runoff (23%), and livestock manure (confined and unconfined, 23%).

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Section: Methodsmentioning

confidence: 99%

Sources and Delivery of Nutrients to the Northwestern Gulf of Mexico from Streams in the South-Central United States1

Rebich

Houston

Mize

et al. 2011

JAWRA Journal of the American Water Resources Association

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“…These analyses were conducted for winter and summer seasons separately as well as for the whole year. Demcheck et al (2004) in southwestern Louisiana. They found maximum concentrations of TN and TP occurring during April through June and minimum concentrations occurring during the fall and the winter months.…”

Section: Journal Of Soil and Water Conservationmentioning

confidence: 99%

Assessment of seasonal and spatial variation of surface water quality, identification of factors associated with water quality variability, and the modeling of critical nonpoint source pollution areas in an agricultural watershed

Poudel¹,

Lee²,

Srinivasan³

et al. 2013

Journal of Soil and Water Conservation

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Surface water quality impairment in agricultural watersheds is a major environmental concern in the United States. To assess seasonal and spatial variability of surface water quality and identify factors associated with surface water quality variability, we monitored surface water quality at seven locations in Bayou Plaquemine Brule Watershed in Louisiana twice monthly from March of 2002 to February of 2008 and performed multivariate analyses of the dataset. Using the Soil and Water Assessment Tool (SWAT) model, we identified critical areas of nonpoint source pollution in the watershed. While temperature, turbidity, dissolved oxygen (DO), conductivity and pH were determined in the field using YSI Sonde (YSI Incorporated, Yellow Springs, Ohio), surface water samples were analyzed for total nitrogen (TN), total phosphorus (TP), nitrate/nitrite-N (NO 3 /NO 2 -N), soluble reactive phosphate (SRP), total suspended solids (TSS), and five-day biological oxygen demand (BOD 5 ) in laboratory. The monthly water quality sampling included a regular sampling and an after-rain-event sampling. Average DO for the summer months, March through November, was 4.91 ± 0.08 mg L -1 (4.91 ± 0.08 ppm), while average DO for the winter months, December through February, was 8.32 ± 0.12 mg L -1 (8.32 ± 0.12 ppm). Dissolved oxygen was negatively correlated with TN (r = -0.22, p ≤ 0.001), SRP (r = -0.17, p ≤ 0.001), TP (r = -0.17, p ≤ 0.001), BOD 5 (r = -0.25, p ≤ 0.001), and surface water temperature (r = -0.70, p ≤ 0.001). Turbidity was strongly correlated with TSS (r = 0.59, p ≤ 0.001), suggesting that most turbidity in the water body comes from suspended solids. Similarly BOD 5 was significantly positively correlated with TN (r = 0.43, p ≤ 0.001), NO 3 /NO 2 -N (r = 0.26, p ≤ 0.001), TP (r = 0.25, p ≤ 0.001), and SRP (r = 0.18, p ≤ 0.001). Results of factor analyses showed sediment, phosphorus (P), nitrogen (N), surface water temperature, dissolved solids, and acidity/alkalinity as the most important factors associated with surface water quality variability in this watershed. Although relatively higher concentrations of sediments, TP, and TN were observed in the upper reaches of the watershed based on water quality monitoring, the SWAT simulation results showed the critical nonpoint source pollution areas of sediment, P, and N in the lower reaches of the watershed. Lower reaches of the watershed have mainly rice and crawfish production, while the upper reaches include primarily sugarcane, pasturelands, and soybean production. Information on seasonal variability of surface water quality, factors associated with surface water quality variability, and the critical areas for nonpoint source pollution will be valuable inputs for developing a watershed management plan for effective nonpoint source pollution control in an agricultural watershed.

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“…The author also thanks the staff at the USGS library in Menlo Park, CA, for having provided copies of so many papers in such a timely manner, and many other colleagues -including Yvonne Roque and Drs. Lynn Roberts, Lisa Nowell, Bill Ball, Markus Flury, Peter Jeffers, Werner Haag, Farla Kaufman, and Chensheng Lu - White River Basin (Indiana) [Carter et al, 1995] Isopropyl group White River Basin (Indiana) [Carter et al, 1995] Carboxymethyl group Urban areas nationwide [Kolpin et al, 2006] Puget Sound Basin (Washington / Canada) [Tesoriero et al, 2001] Lower Tennessee River Basin (Tennessee) [Woodside et al, 2004] Acadian-Pontchartrain Basin (Louisiana) [Demcheck et al, 2004 Figure 19 Examples of electron-transfer and photolytic reactions for which data on the occurrence of the products, as well as the pesticide parent compounds, have been reported in environmental media. The term 'pedobiotic' refers to processes occurring in the soil that are biologically mediated, primarily by microorganisms.…”

Section: Acknowledgmentsmentioning

confidence: 99%

The Geochemistry of Pesticides

Barbash

2014

Treatise on Geochemistry

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Water quality in the Acadian-Pontchartrain drainages: Louisiana and Mississippi, 1999–2001

Cited by 10 publications

References 0 publications

Sources and Delivery of Nutrients to the Northwestern Gulf of Mexico from Streams in the South-Central United States1

Sources and Delivery of Nutrients to the Northwestern Gulf of Mexico from Streams in the South-Central United States1

Assessment of seasonal and spatial variation of surface water quality, identification of factors associated with water quality variability, and the modeling of critical nonpoint source pollution areas in an agricultural watershed

The Geochemistry of Pesticides

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