Differentiating Impacts of Land Use Changes from Pasture Management in a CEAP Watershed Using the SWAT Model

Chiang, Li-Chi; Chaubey, Indrajeet; Gitau, Margaret W.; Arnold, Jeffrey G.

doi:10.13031/2013.34901

Cited by 63 publications

(48 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The selected values ( Table 1) were identical to those reported by [15,39] for PPERCO and by [51] for PHOSKD. The default value used for the phosphorus availability index (PSP) was obtained from either from the SSURGO soil or SC Orangeburg County soil survey report.…”

Section: Model Parameterizationsupporting

confidence: 73%

SWAT Model Prediction of Phosphorus Loading in a South Carolina Karst Watershed with a Downstream Embayment

Amatya¹,

Jha²,

Williams³

et al. 2013

JEP

View full text Add to dashboard Cite

The SWAT model was used to predict total phosphorus (TP) loadings for a 1555-ha karst watershed-Chapel Branch Creek (CBC)-which drains to a lake via a reservoir-like embayment (R-E). The model was first tested for monthly streamflow predictions from tributaries draining three potential source areas as well as the downstream R-E, followed by TP loadings using data collected March 2007-October 2009. Source areas included 1) a golf course that received applied wastewater, 2) urban areas, highway, and some agricultural lands, and 3) a cave spring draining a second golf course along with agricultural and forested areas, including a substantial contribution of subsurface water via karst connectivity. SWAT predictions of mean monthly TP loadings at the first two source outlets were deemed reasonable. However, the predictions at the cave spring outlet were somewhat poorer, likely due to diffuse variable groundwater flow from an unknown drainage area larger than the actual surface watershed, for which monthly subsurface flow was represented as a point source during simulations. Further testing of the SWAT model to predict monthly TP loadings at the R-E, modeled as a completely mixed system, resulted in their over-predictions most of the months, except when high lake water levels occurred. The mean monthly and annual flows were calibrated to acceptable limits with the exception of flow over-prediction when lake levels were low and surface water from tributaries disappeared into karst connections. The discrepancy in TP load predictions was attributed primarily to the use of limited monthly TP data collected during baseflow in the embayment. However, for the 22-month period, over-prediction of mean monthly TP load (34.6 kg/mo) by 13% compared to measured load (30.6 kg/mo) in the embayment was deemed acceptable. Simulated results showed a 42% reduction in TP load due to settling in the embayment.

show abstract

Section: Model Parameterizationsupporting

confidence: 73%

SWAT Model Prediction of Phosphorus Loading in a South Carolina Karst Watershed with a Downstream Embayment

Amatya¹,

Jha²,

Williams³

et al. 2013

JEP

View full text Add to dashboard Cite

show abstract

“…Wu et al [49] In addition, analyzed the possible future water demand and water availability with the application of the CGE model and the SWAT model in the rapidly urbanized Heihe River Basin, Northwest China, based on different climate and land use change scenarios. SWAT is also applied to investigate the hydrologic and water quality responses to land use/cover changes, for example, Chiang et al [50] assessed individual impacts of land use/cover change and pasture management on water quality, including sediment, N, and P losses, with the application of SWAT2009.…”

Section: Swat Modelmentioning

confidence: 99%

Scenario Analysis for Water Resources in Response to Land Use Change in the Middle and Upper Reaches of the Heihe River Basin

Deng

et al. 2015

Sustainability

View full text Add to dashboard Cite

Abstract:Water availability is at the core of sustainable socioeconomic development and ecological conservation along with global climate and land use changes, especially in the areas that experience water problems. This study investigated the impacts of land use change on surface runoff and water yield with scenario-based land use change in the upper and middle reaches of the Heihe River Basin, the second largest inland river basin in the arid region of northwestern China. Firstly, three land use structure scenarios were established, with different water utilization ratio levels (low-level, middle-level and high-level water utilization ratios). Then the spatial pattern of land uses was simulated with the Dynamic of Land System (DLS). Thereafter, the simulated land use data were used as the input data to drive the Soil and Water Assessment Tool (SWAT) model, keeping other input data unchanged to isolate the land use change impacts on surface runoff and water yield. The results showed that the forestland and grassland will expand along with the increase in water utilization ratio. The quick-response surface runoff would decrease significantly due to forest and grassland expansion, which may cause an overall decreasing trend of the water yield. This indicated OPEN ACCESSSustainability 2015, 7 3087 the unreasonable allocation of water resources may exert negative impacts on the water yield even if the water utilization ratio is increased; therefore, water resources should be reasonably allocated for different land use demand, which is critical for sustainable development. The results of this study will be informative to decision makers for sustainable water resource and land management when facing land use change and an increasing demand for water resources in the Heihe River Basin.

show abstract

“…Excessive fertilization of farmland often affects in-stream processes, such as biotic and abiotic immobilization and mineralization in river channels (Johnson et al, 1997). The major environmental consequences of excessive phosphorous and nitrogen inputs are water pollution, biodiversity loss, and eutrophication in aquatic ecosystems Chiang et al, 2010). Intensification of agricultural land including intensive cultivation of annual crops, plowing of soil on steep slopes, and poor soil conservation practices also produce serious soil erosion following soil nutrient depletion (Alibuyog et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Simulation of watershed hydrology and stream water quality under land use and climate change scenarios in Teshio River watershed, northern Japan

Min

Shibata

2015

Ecological Indicators

177

View full text Add to dashboard Cite

Differentiating Impacts of Land Use Changes from Pasture Management in a CEAP Watershed Using the SWAT Model

Cited by 63 publications

References 37 publications

SWAT Model Prediction of Phosphorus Loading in a South Carolina Karst Watershed with a Downstream Embayment

SWAT Model Prediction of Phosphorus Loading in a South Carolina Karst Watershed with a Downstream Embayment

Scenario Analysis for Water Resources in Response to Land Use Change in the Middle and Upper Reaches of the Heihe River Basin

Simulation of watershed hydrology and stream water quality under land use and climate change scenarios in Teshio River watershed, northern Japan

Contact Info

Product

Resources

About