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You searched for: Journal name Transactions of the ASAE Remove constraint Journal name: Transactions of the ASAE Subject watersheds Remove constraint Subject: watersheds
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1. Air pressures over surfaces exposed to wind. I. Water harvesting catchments

Author:
Dedrick, A.R.
Source:
Transactions of the ASAE 1974 v.17 no.5 pp. 917-921
ISSN:
0001-2351
Subject:
atmospheric pressure; water harvesting; watersheds; wind speed; wind tunnels
Abstract:
... The magnitude and location of wind forces over unprotected water harvesting catchment aprons constructed of exposed flexible membrane liners were determined by the use of models in a wind tunnel. Geometric factors studied included two berm configurations [gradually (1:10) and sineshaped slopes] and four breadth (distance between berms) to berm-height ratios. ...
Handle:
10113/54584

2. Application of a Watershed Model to Evaluate Management Effects on Point and Nonpoint Source Pollution

Author:
Santhi, C.; Arnold, J.G.; Williams, J.R.; Hauck, L.M.; Dugas, W.A.
Source:
Transactions of the ASAE 2001 v.44 no.6 pp. 1559-1570
ISSN:
0001-2351
Subject:
Soil and Water Assessment Tool model; animal manure management; best management practices; dairy manure; municipal wastewater; nonpoint source pollution; nutrient transport; phosphorus; pollution control; rivers; sediments; total maximum daily load; wastewater treatment; watersheds; Texas
Abstract:
... A Total Maximum Daily Load (TMDL) program has been initiated in the North Bosque River Watershed in Texas, USA, where point and nonpoint sources of pollution are of a concern. The Soil and Water Assessment Tool (SWAT), which had been validated for flow and sediment and nutrient transport, was applied to quantify the effects of Best Management Practices (BMPs) related to dairy manure management and ...

3. Appropriate Land Use Planning for Slope Land in Taiwan

Author:
Lo, K.F.A.
Source:
Transactions of the ASAE 2002 v.45 no.2 pp. 309-313
ISSN:
0001-2351
Subject:
conservation practices; humans; interviews; land use planning; models; soil water; sustainable development; water conservation; water resources; watersheds; Taiwan
Abstract:
... Thorough land use planning in a slope land watershed requires careful consideration of both natural and social conditions. A modified "simple-accurate" method was used to estimate a land use potential value for each terrain unit of a slope land watershed in Taiwan. Soil loss estimates based on erosion modeling served as a guide for determining the most suitable land use type. The social feedback t ...
DOI:
10.13031/2013.8525

4. Basal sediment concentration measurement using a time domain reflectometry method

Author:
Starr, G.C.
Source:
Transactions of the ASAE 2005 v.48 no.1 pp. 205-209
ISSN:
0001-2351
Subject:
sediment yield; rangelands; dielectric properties; stream channels; probes (equipment); time domain reflectometry; watersheds; watershed hydrology; runoff; water erosion; Arizona
Abstract:
... Sediment concentration measurement in high-concentration runoff waters is highly problematic. A novel device was developed for high-concentration measurements. This device was then used to measure sediment concentrations during monsoon runoff events at the USDA-ARS Walnut Gulch experimental watershed in southeast Arizona as an example application. Data were obtained using a 55 cm, three-prong, emb ...
Handle:
10113/5477

5. Depth-area relationships for thunderstorm rainfall in southeastern Arizona

Author:
Osborn, H.B.; Lane, L.J.
Source:
Transactions of the ASAE 1972 v.15 no.4 pp. 670-680
ISSN:
0001-2351
Subject:
simulation models; stormwater; spatial distribution; equations; rangeland soils; depth; watersheds; rain; semiarid soils; storms; Arizona
Abstract:
... Data from a dense network of recording rain gages in southeastern Arizona are used to quantitatively describe thunderstorm rainfall with depth-area equations, and these equations are compared to those from the earlier models. ...
Handle:
10113/6180

6. Development and testing of a water management model (WATRCOM): development

Author:
Parsons, J.E.; Skaggs, R.W.; Doty, C.W.
Source:
Transactions of the ASAE 1991 v.34 no.1 pp. 120-128
ISSN:
0001-2351
Subject:
simulation models; water management; drainage channels; watersheds; water table; Southeastern United States
Abstract:
... Drainage is required in many agricultural watersheds in the southeastern United States for flood prevention and to sustain agricultural production. These drainage improvements often increase the severity of summer droughts by lowering water tables. A computer simulation model, WATRCOM, has been developed to assist in evaluating drainage improvements and the feasibility of using channel water level ...
Handle:
10113/18147

7. Development and testing of a water management model (WATRCOM): field testing

Author:
Parsons, J.E.; Doty, C.W.; Skaggs, R.W.
Source:
Transactions of the ASAE 1991 v.34 no.4 pp. 1674-1682
ISSN:
0001-2351
Subject:
simulation models; water conservation; fluid mechanics; watersheds; drainage; water table; North Carolina
Abstract:
... Water table observations from the 1000 ha watershed of Mitchell Creek near Tarboro, NC, were used to field test the water management model, WATRCOM. Soil properties and channel boundary conditions from three sections of the watershed along with weather data from years 1983 and 1984 were used to simulate the hydrology of the area with and without channel water level control. Six transects containin ...
Handle:
10113/18149

8. Estimating Near-Surface Soil Moisture using Active Microwave Satellite Imagery and Optical Sensor Inputs

Author:
J. M. S. Hutchinson
Source:
Transactions of the ASAE 2003 v.46 no.2 pp. 225-236
ISSN:
0001-2351
Subject:
Landsat; data collection; ecosystems; environmental models; geographic information systems; grasslands; image interpretation; monitoring; radar; remote sensing; soil water; time series analysis; watersheds; Kansas
Abstract:
... Recent advances in radar remote sensing techniques illustrate the potential for monitoring soil moisture conditions at spatial and temporal scales required for regional and local modeling efforts. This research examined the feasibility of producing accurate and spatially distributed estimates of soil moisture using a time series of ERS–2 radar images for a tallgrass prairie ecosystem in northeas ...
DOI:
10.13031/2013.12972

9. Estimation of long-term soil moisture using a distributed parameter hydrologic model and verification using remotely sensed data

Author:
Narasimhan, B.; Srinivasan, R.; Arnold, J.G.; Di Luzio, M.
Source:
Transactions of the ASAE 2005 v.48 no.3 pp. 1101-1113
ISSN:
0001-2351
Subject:
Soil and Water Assessment Tool model; soil water content; soil water; temporal variation; spatial variation; stream flow; watershed hydrology; watersheds; evapotranspiration; remote sensing; Texas
Abstract:
... Soil moisture is an important hydrologic variable that controls various land surface processes. In spite of its importance to agriculture and drought monitoring, soil moisture information is not widely available on a regional scale. However, long-term soil moisture information is essential for agricultural drought monitoring and crop yield prediction. The hydrologic model Soil and Water Assessment ...
Handle:
10113/5510

10. Evaluation of AnnAGNPS on Mississippi Delta MSEA watersheds

Author:
Yuan, Y.; Bingner, R.L.; Rebich, R.A.
Source:
Transactions of the ASAE 2001 v.44 no.5 pp. 1183-1190
ISSN:
0001-2351
Subject:
watersheds; crop production; crop management; cover crops; winter; pollution control; water pollution; erosion control; water erosion; sediment yield; simulation models; agricultural land; losses from soil; runoff; prediction; best management practices; nonpoint source pollution; Mississippi
Abstract:
... Sediment and its associated pollutants entering a water body can be very destructive to the health of that system. Best Management Practices (BMPs) can be used to reduce these pollutants, but understanding the most effective practices is very difficult. Watershed models are the most cost-effective tools to aid in the decision-making process of selecting the BMP that is most effective in reducing t ...
Handle:
10113/26652

11. Flow-proportional, time-composited, and grab sample estimation of nitrogen from an eastern Coastal Plain watershed

Author:
Stone, K.C.; Hunt, P.G.; Novak, J.M.; Johnson, M.H.; Watts, D.W.
Source:
Transactions of the ASAE 2000 v.43 no.2 pp. 281-290
ISSN:
0001-2351
Subject:
sampling; stream flow; water quality; nitrate nitrogen; watersheds; ammonium nitrogen; North Carolina
Abstract:
... The balance between resources expended and information obtained is an integral aspect of water quality investigations. As part of a Water Quality Demonstration Project in the eastern Coastal Plain, we monitored stream water quality at the watershed outlet. Four methods of assessing stream water quality were compared. These methods were time-composite sampling with continuous flow measurements (TC) ...
Handle:
10113/18418

12. Impact of swine waste application on ground and stream water quality in an eastern Coastal Plain watershed

Author:
Stone, K.C.; Hunt, P.G.; Humenik, F.J.; Johnson, M.H.
Source:
Transactions of the ASAE 1998 v.41 no.6 pp. 1665-1670
ISSN:
0001-2351
Subject:
environmental impact; nitrate nitrogen; water quality; water pollution; watersheds; pig manure
Abstract:
... Nonpoint source pollution from agriculture has been a major concern, particularly where intensive agricultural operations exist near environmentally sensitive waters. To address these concerns, a water quality project was initiated in Duplin County, North Carolina, in the 2044-ha Herrings Marsh Run watershed. A swine farm within this monitored watershed expanded its operation from 3,300 to more th ...
Handle:
10113/18070

13. Modified Scs Curve Number Method for Predicting Subsurface Drainage Flow

Author:
Yuan, Y.; Mitchell, J.K.; Hirschi, M.C.; Cooke, R.A.C.
Source:
Transactions of the ASAE 2001 v.44 no.6 pp. 1673-1682
ISSN:
0001-2351
Subject:
equations; monitoring; prediction; rain; rivers; runoff; statistical analysis; subsurface drainage; subsurface flow; watersheds; Illinois
Abstract:
... Agricultural fields in Central Illinois are predominantly drained by subsurface drainage systems, which often are in depressional areas. The prediction of outflow from drainage systems is a challenge. The SCS curve number (SCS-CN) method is a popular method for evaluating direct runoff from rainfall. The concept behind this method can be applied to subsurface drainage flow. The SCS-CN method was m ...

14. Nitrate-N distribution and trends in shallow groundwater on an eastern Coastal Plains Watershed

Author:
Stone, K.C.; Hunt, P.G.; Johnson, M.H.; Matheny, T.A.
Source:
Transactions of the ASAE 1998 v.41 no.1 pp. 59-64
ISSN:
0001-2351
Subject:
groundwater contamination; agricultural land; nitrate nitrogen; watersheds; drinking water; land application; pig manure; North Carolina
Abstract:
... Nonpoint source pollution from agriculture has been a major concern, particularl y where intensive agricultural operations exist near environmentally sensitive w aters. To address these nonpoint source pollution concerns, a Water Quality Demo nstration Project (WQDP) was initiated on the Herrings Marsh Run (HMR) watershed in Duplin County, North Carolina. The WQDP was implemented to determine wate ...
Handle:
10113/18068

15. Practical Thresholds for Separating Erosive and Non-Erosive Storms

Author:
Xie, Y.; Liu, B.; Nearing, M.A.
Source:
Transactions of the ASAE 2002 v.45 no.6 pp. 1843-1847
Subject:
sediments; soil conservation; accuracy; watersheds; rain; rain intensity; Universal Soil Loss Equation; erodibility; storms; measurement; water erosion; runoff; China
Abstract:
... Determination of a practical threshold for separating erosive and non-erosive rainfall events can reduce the amount of work necessary to read rainfall charts and to calculate rainfall erosivity. The objective of this study was to develop a method of determining practical thresholds for erosive rainfall events and to evaluate its effectiveness for calculation of erosivity. Rainfall and runoff data ...
Handle:
10113/7025

16. Problems and potential of autocalibrating a hydrologic model

Author:
Van Liew, M.W.; Arnold, J.G.; Bosch, D.D.
Source:
Transactions of the ASAE 2005 v.48 no.3 pp. 1025-1040
ISSN:
0001-2351
Subject:
stream flow; hydrologic data; calibration; model validation; watersheds; watershed hydrology; Soil and Water Assessment Tool model; Oklahoma; Georgia
Abstract:
... An investigation was conducted to evaluate strengths and limitations of manual calibration and the existing autocalibration tool in the watershed-scale model referred to as the Soil and Water Assessment Tool (SWAT). Performance of the model was tested on the Little River Experimental Watershed in Georgia and the Little Washita River Experimental Watershed in Oklahoma, both USDA-ARS watersheds. A l ...
Handle:
10113/5506

17. Quantifying the sensitivity of the Riparian Ecosystem Management Model (REMM) to changes in climate and buffer characteristics common to conservation practices

Author:
Graff, C.D.; Sadeghi, A.M.; Lowrance, R.R.; Williams, R.G.
Source:
Transactions of the ASAE 2005 v.48 no.4 pp. 1377-1387
ISSN:
0001-2351
Subject:
riparian buffers; simulation models; plant growth; nitrogen; leaf area index; watersheds; losses from soil; nonpoint source pollution; watershed hydrology; nitrates; climate change; rooting; phosphorus; hydrologic models
Abstract:
... Conservation practices, such as buffers, are often installed to mitigate the effects of nutrients and sediment runoff from agricultural practices. The Riparian Ecosystem Management Model (REMM) was developed as process-based model to evaluate the fate of nutrients and sediment through a riparian buffer up to the edge of a stream. A one-at-a-time sensitivity analysis was performed on REMM to evalua ...
Handle:
10113/5515

18. Representative Hillslope Methods for Applying the WEPP Model with DEMs and GIS

Author:
Cochrane, T.A.; Flanagan, D.C.
Source:
Transactions of the ASAE 2003 v.46 no.4 pp. 1041-1049
Subject:
topography; digital elevation models; geographic information systems; watersheds; soil erosion models; hills; water erosion; hydrologic models; prediction
Abstract:
... In watershed modeling with WEPP, the process of manually identifying hillslopes and channels is very time consuming and can be subject to large variation between users. Furthermore, the representation of hillslope profiles is subjective and can differ between different modelers. To overcome this, modeling procedures called the Hillslope methods were developed that use geographical information syst ...
Handle:
10113/48997

19. Runoff curve number variation with drainage area, Walnut Gulch, Arizona

Author:
Simanton, J.R.; Hawkins, R.H.; Mohseni-Saravi, M.; Renard, K.G.
Source:
Transactions of the ASAE 1996 v.39 no.4 pp. 1391-1394
ISSN:
0001-2351
Subject:
watersheds; rain; runoff; drainage; semiarid zones; spatial variation; environmental impact; methodology; equations; ground vegetation; Arizona
Abstract:
... Runoff Curve Numbers (a measure of a watershed's runoff response to a rainstorm) were determined using three different methods for 18 semiarid watersheds in southeastern Arizona. Each of the methods produced similar results. A relationship was then developed between optimum Curve Number and drainage area of the watershed used. Curve Numbers decreased with increasing drainage area. This response is ...
Handle:
10113/6089

20. Runoff from Cotton Fields Fertilized with Poultry Litter

Author:
Vories, E.D.; Costello, T.A.; Glover, R.E.
Source:
Transactions of the ASAE 2001 v.44 no.6 pp. 1495-1502
ISSN:
0001-2351
Subject:
Gossypium hirsutum; agronomic traits; cotton; crop production; cropland; exports; farmers; fertilizer rates; fertilizers; grazing; hay; monitoring; nitrate nitrogen; nutrients; orthophosphates; phosphorus; poultry manure; river deltas; runoff; soil amendments; soil structure; split application; total suspended solids; water quality; watersheds; Arkansas; Mississippi River
Abstract:
... Broiler litter is a valuable soil amendment for crop production, with litter typically applied to land areas used for grazing and/or hay production. Historically, farmers have based litter application rates on the nitrogen (N) needs of the receiving crop; however, this results in over-application of phosphorus (P). To alleviate the tendency to accumulate P in nearby watersheds, export of litter to ...