scholarly journals Detecting Signals of Large‐Scale Climate Phenomena in Discharge and Nutrient Loads in the Mississippi‐Atchafalaya River Basin

2019 ◽  
Vol 46 (7) ◽  
pp. 3791-3801 ◽  
Author(s):  
A. P. Smits ◽  
C. M. Ruffing ◽  
T. V. Royer ◽  
A. P. Appling ◽  
N. A. Griffiths ◽  
...  
Keyword(s):  
River Basin ◽  
Large Scale ◽  
Nutrient Loads ◽  
Atchafalaya River ◽  
Atchafalaya River Basin

scholarly journals Statistical Analysis of Nutrient Loads from the Mississippi-Atchafalaya River Basin (MARB) to the Gulf of Mexico

Environments ◽  
2020 ◽  
Vol 7 (1) ◽  
pp. 8
Author(s):  
Phyllis Okwan ◽  
Yi Zhen ◽  
Huan Feng ◽  
Shinjae Yoo ◽  
Murty S. Kambhampati ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Hurricane Katrina ◽  
River Basin ◽  
Weather Conditions ◽  
Steady Increase ◽  
Moderate Increase ◽  
Nutrient Loads ◽  
Atchafalaya River ◽  
Significant Difference ◽  
Atchafalaya River Basin

This study investigated the annual and seasonal variations in nutrient loads (NO2− + NO3− and orthophosphate) delivered to the Gulf of Mexico from the Mississippi-Atchafalaya River Basin (MARB) and examined the water quality variations. The results indicate that (1) annually, the mean NO2− + NO3− and orthophosphate loads showed a steady increase during 1996–1999, a persistent level during 2000–2007, and a moderate increase during 2008–2016; (2) seasonally, NO2− + NO3− and orthophosphate in MARB in spring and summer were higher than those in autumn and winter. Analysis of variance (ANOVA) identified highly significant differences among seasonal loads; and (3) the median value of NO2− + NO3− in normal weather conditions were higher than that during and right after the hurricanes, while the median value of orthophosphate loads in normal weather conditions was higher than that during the hurricanes, but higher than that right after hurricanes. The two-sample t-test indicates a significant difference (p < 0.046) in orthophosphate loads before and after Hurricane Katrina. Moreover, it is found that there is a significant (p < 0.01) increase in nutrient loads during normal weather conditions. The results indicate that hurricane seasons can significantly influence the nutrient loads from the MARB to the Gulf of Mexico.

scholarly journals Some Challenges in Hydrologic Model Calibration for Large-Scale Studies: A Case Study of SWAT Model Application to Mississippi-Atchafalaya River Basin

Hydrology ◽  
2019 ◽  
Vol 6 (1) ◽  
pp. 17 ◽  
Author(s):  
Narayanan Kannan ◽  
Chinnasamy Santhi ◽  
Michael J. White ◽  
Sushant Mehan ◽  
Jeffrey G. Arnold ◽  
...  
Keyword(s):  
United States ◽  
River Basin ◽  
Model Calibration ◽  
Large Scale ◽  
Swat Model ◽  
The United States ◽  
Hydrologic Model ◽  
Calibration Target ◽  
Atchafalaya River ◽  
Atchafalaya River Basin

This study is a part of the Conservation Effects Assessment Project (CEAP) aimed to quantify the environmental and economic benefits of conservation practices implemented in the cultivated cropland throughout the United States. The Soil and Water Assessment Tool (SWAT) model under the Hydrologic United Modeling of the United States (HUMUS) framework was used in the study. An automated flow calibration procedure was developed and used to calibrate runoff for each 8-digit watershed (within 20% of calibration target) and the partitioning of runoff into surface and sub-surface flow components (within 10% of calibration target). Streamflow was validated at selected gauging stations along major rivers within the river basin with a target R2 of >0.6 and Nash and Sutcliffe Efficiency of >0.5. The study area covered the entire Mississippi and Atchafalaya River Basin (MARB). Based on the results obtained, our analysis pointed out multiple challenges to calibration such as: (1) availability of good quality data, (2) accounting for multiple reservoirs within a sub-watershed, (3) inadequate accounting of elevation and slopes in mountainous regions, (4) poor representation of carrying capacity of channels, (5) inadequate capturing of the irrigation return flows, (6) inadequate representation of vegetative cover, and (7) poor representation of water abstractions (both surface and groundwater). Additional outstanding challenges to large-scale hydrologic model calibration were the coarse spatial scale of soils, land cover, and topography.

Denitrification in cypress swamp within the Atchafalaya River Basin, Louisiana

Chemosphere ◽  
2008 ◽  
Vol 70 (5) ◽  
pp. 886-894 ◽  
Author(s):  
C.W. Lindau ◽  
R.D. Delaune ◽  
A.E. Scaroni ◽  
J.A. Nyman
Keyword(s):  
River Basin ◽  
Atchafalaya River ◽  
Cypress Swamp ◽  
Atchafalaya River Basin

scholarly journals Floodplain biogeochemical processing of floodwaters in the Atchafalaya River Basin during the Mississippi River flood of 2011

2014 ◽  
Vol 119 (4) ◽  
pp. 537-546 ◽  
Author(s):  
Durelle T. Scott ◽  
Richard F. Keim ◽  
Brandon L. Edwards ◽  
C. Nathan Jones ◽  
Daniel E. Kroes
Keyword(s):  
River Basin ◽  
Mississippi River ◽  
Atchafalaya River ◽  
River Flood ◽  
Atchafalaya River Basin
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