Best Management Practices Affect Water Quality in Coastal Watersheds

Coastal ecosystems are vulnerable due to watershed sediment and nutrient loads. In this study, the hydrology and water quality of two coastal watersheds, Wolf River watershed (WRW) and Jourdan River watershed (JRW), were assessed using the Soil and Water Assessment Tool (SWAT). Model performance evaluation was performed using the coefficient of determination (R2) and the Nash–Sutcliffe Efficiency (NSE). After model calibration and validation, the effectiveness of ponds, wetlands, riparian buffers, and their combination as best management practices (BMPs) were analyzed. Total suspended solids (TSS) was reduced by 31.15% in the pond scenario and 30.37% in the wetland in WRW. In addition, mineral phosphorous (MinP) was reduced by 11.84% and 9.63% in ponds and wetlands, respectively. Similarly, in JRW, TSS was reduced by 74.89% in ponds and 74.90% in wetlands. Likewise, ponds and wetlands reduced MinP by 8.05% and 13.40%, respectively. Among four riparian buffer scenarios, the 30 m buffer prompted the estimation of higher reductions such as TSS by 28.36% and MinP by 29.77% in WRW, whereas a 13.14% TSS and 22.89% MinP reduction in JRW. In addition, combined BMP, TSS was reduced by 30.37% and MinP by 52.09% in WRW, followed by a 74.92% reduction in TSS and 27.37% in MinP in JRW. All BMP implementations were effective in reducing TSS and MinP. This study suggests that ponds and wetlands were effective in reducing TSS and riparian buffers were effective in reducing MinP. These findings could be insightful in coastal watershed management.

[1]  P. Parajuli,et al.  Comparison of Flood Frequency at Different Climatic Scenarios in Forested Coastal Watersheds , 2023, Climate.

[2]  P. Parajuli,et al.  Assessment of Best Management Practices on Hydrology and Sediment Yield at Watershed Scale in Mississippi Using SWAT , 2022, Agriculture.

[3]  P. Parajuli,et al.  Assessment of BMPs by Estimating Hydrologic and Water Quality Outputs Using SWAT in Yazoo River Watershed , 2022, Agriculture.

[4]  P. Parajuli,et al.  Evaluation of the Impact of Best Management Practices on Streamflow, Sediment and Nutrient Yield at Field and Watershed Scales , 2022, Water Resources Management.

[5]  E. Schilling,et al.  Linkages between Forestry Best Management Practices and erosion in the southeastern U.S. , 2022, Journal of environmental management.

[6]  P. Srivastava,et al.  Improving the representation of forests in hydrological models. , 2021, The Science of the total environment.

[7]  N. Stenseth,et al.  Multiple pollutants stress the coastal ecosystem with climate and anthropogenic drivers. , 2021, Journal of hazardous materials.

[8]  T. R. Fisher,et al.  An evaluation of the Chesapeake Bay management strategy to improve water quality in small agricultural watersheds. , 2021, Journal of environmental management.

[9]  Yung-Chieh Wang,et al.  Applicability of modified SWAT model (SWAT-Twn) on simulation of watershed sediment yields under different land use/cover scenarios in Taiwan , 2021, Environmental Monitoring and Assessment.

[10]  M. Bini,et al.  Climate Change and Anthropogenic Impact on Coastal Environments , 2021, Water.

[11]  R. Pavlowsky,et al.  Simulating nonpoint source pollutant loading in a karst basin: A SWAT modeling application , 2021 .

[12]  Yasuyo K. Makido,et al.  Effects of land use change, wetland fragmentation, and best management practices on total suspended sediment concentrations in an urbanizing Oregon watershed, USA. , 2021, Journal of environmental management.

[13]  D. Sawyer,et al.  Vulnerability to watershed erosion and coastal deposition in the tropics , 2021, Scientific reports.

[14]  A. St‐Hilaire,et al.  Assessment of the effective width of riparian buffer strips to reduce suspended sediment in an agricultural landscape using ANFIS and SWAT models , 2020 .

[15]  A. Richards,et al.  Integrating watershed and ecosystem service models to assess best management practice efficiency: guidelines for Lake Erie managers and watershed modellers , 2020 .

[16]  D. Liu,et al.  Using an improved SWAT model to simulate hydrological responses to land use change: A case study of a catchment in tropical Australia , 2020 .

[17]  R. Srinivasan,et al.  Assessing the Impact of Best Management Practices in a Highly Anthropogenic and Ungauged Watershed Using the SWAT Model: A Case Study in the El Beal Watershed (Southeast Spain) , 2019, Agronomy.

[18]  R. Jiang,et al.  Soil and Water Assessment Tool (SWAT) Model: A Systemic Review , 2019, Journal of Coastal Research.

[19]  R. Cunning,et al.  Extensive coral mortality and critical habitat loss following dredging and their association with remotely-sensed sediment plumes. , 2019, Marine pollution bulletin.

[20]  E. Fulton,et al.  Severe Continental-Scale Impacts of Climate Change Are Happening Now: Extreme Climate Events Impact Marine Habitat Forming Communities Along 45% of Australia’s Coast , 2019, Front. Mar. Sci..

[21]  R. Abell,et al.  Freshwater biodiversity conservation through source water protection: Quantifying the potential and addressing the challenges , 2019, Aquatic Conservation: Marine and Freshwater Ecosystems.

[22]  G. Oelsner,et al.  Recent trends in nutrient and sediment loading to coastal areas of the conterminous U.S.: Insights and global context. , 2019, The Science of the total environment.

[23]  K. Nadaoka,et al.  Assessment of water quality and evaluation of best management practices in a small agricultural watershed adjacent to Coral Reef area in Japan , 2019, Agricultural Water Management.

[24]  Yongping Yuan,et al.  Evaluation of SWAT Impoundment Modeling Methods in Water and Sediment Simulations , 2018, Journal of the American Water Resources Association.

[25]  A. El‐Kadi,et al.  Assessment of SWAT Model Performance in Simulating Daily Streamflow under Rainfall Data Scarcity in Pacific Island Watersheds , 2018, Water.

[26]  Mohammad Hossein Niksokhan,et al.  CHARGED SYSTEM SEARCH FOR OPTIMUM DESIGN OF COST-EFFECTIVE STRUCTURAL BEST MANAGEMENT PRACTICES FOR IMPROVING WATER QUALITY , 2018 .

[27]  Jilan Su,et al.  Major threats of pollution and climate change to global coastal ecosystems and enhanced management for sustainability. , 2018, Environmental pollution.

[28]  Gurdeep Singh,et al.  Assessing the impact of the MRBI program in a data limited Arkansas watershed using the SWAT model , 2018 .

[29]  Indrajeet Chaubey,et al.  A review on effectiveness of best management practices in improving hydrology and water quality: Needs and opportunities. , 2017, The Science of the total environment.

[30]  A. Elçi,et al.  Evaluation of nutrient retention in vegetated filter strips using the SWAT model. , 2017, Water science and technology : a journal of the International Association on Water Pollution Research.

[31]  A. Parsons,et al.  A review of the principles of turbidity measurement , 2017 .

[32]  Dennis Trolle,et al.  The impact of the objective function in multi-site and multi-variable calibration of the SWAT model , 2017, Environ. Model. Softw..

[33]  Yongbo Liu,et al.  An Open Source GIS‐Based Decision Support System for Watershed Evaluation of Best Management Practices , 2017 .

[34]  B. Silliman,et al.  Effects of predation and nutrient enrichment on the success and microbiome of a foundational coral. , 2017, Ecology.

[35]  A. Klik,et al.  Modeling streamflow and sediment using SWAT in Ethiopian Highlands , 2016 .

[36]  L. Kurkalova,et al.  Prioritizing Watersheds for Conservation Actions in the Southeastern Coastal Plain Ecoregion , 2015, Environmental Management.

[37]  T. Lemann,et al.  Comparing CFSR and conventional weather data for discharge and soil loss modelling with SWAT in small catchments in the Ethiopian Highlands , 2015 .

[38]  Hans W. Paerl,et al.  Harmful Cyanobacterial Blooms: Causes, Consequences, and Controls , 2013, Microbial Ecology.

[39]  Farida Dechmi,et al.  SWAT application in intensive irrigation systems: Model modification, calibration and validation , 2012 .

[40]  Misganaw Demissie,et al.  Optimizing the placement of best management practices (BMPs) in agriculturally-dominated watersheds in Illinois , 2011 .

[41]  D. R. Hart,et al.  Nutrient enrichment and fisheries exploitation: interactive effects on estuarine living resources and their management , 2009, Hydrobiologia.

[42]  F. Hossain,et al.  Assessment of water quality conditions in the St. Louis Bay watershed , 2008, Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering.

[43]  Jeffrey G. Arnold,et al.  The Soil and Water Assessment Tool: Historical Development, Applications, and Future Research Directions , 2007 .

[44]  Kangsheng Wu,et al.  EVALUATION OF THE APPLICABILITY OF THE SWAT MODEL FOR COASTAL WATERSHEDS IN SOUTHEASTERN LOUISIANA 1 , 2006 .

[45]  P. Krause,et al.  COMPARISON OF DIFFERENT EFFICIENCY CRITERIA FOR HYDROLOGICAL MODEL ASSESSMENT , 2005 .

[46]  P. Fiener,et al.  Managing erosion and water quality in agricultural watersheds by small detention ponds , 2005 .

[47]  J. Ellis,et al.  Muddy waters: elevating sediment input to coastal and estuarine habitats , 2004 .

[48]  W. Mitsch,et al.  Reducing Nitrogen Loading to the Gulf of Mexico from the Mississippi River Basin: Strategies to Counter a Persistent Ecological Problem , 2001 .

[49]  John R. Williams,et al.  LARGE AREA HYDROLOGIC MODELING AND ASSESSMENT PART I: MODEL DEVELOPMENT 1 , 1998 .

[50]  J. Nash,et al.  River flow forecasting through conceptual models part I — A discussion of principles☆ , 1970 .

[51]  Anna C. Linhoss,et al.  Applications of the SWAT Model for Coastal Watersheds: Review and Recommendations , 2022, Journal of the ASABE.

[52]  E. Schilling,et al.  Audit procedures and implementation rates for forest water quality Best Management Practices in the 13 southeastern states , 2022, Journal of Soil and Water Conservation.

[53]  P. Reich,et al.  Biomass allocation to leaves, stems and roots: meta-analyses of interspecific variation and environmental control. , 2012, The New phytologist.

[54]  D. M. Amatya,et al.  Evaluating the SWAT Model for a Low-Gradient Forested Watershed in Coastal South Carolina , 2011 .