Your search found 19 records
1 Raghuwanshi, N. S.; Wallender, W. W. 1996. Modeling seasonal furrow irrigation. Journal of Irrigation and Drainage Engineering, 122(4):235-242.
Furrow irrigation ; Irrigation scheduling ; Simulation ; Mathematical models ; Calibrations ; Surface irrigation ; Soil moisture ; Infiltration ; Crop yield ; Soil water ; Evapotranspiration / USA / California
(Location: IWMI-HQ Call no: PER Record No: H018810)
A seasonal furrow irrigation model consisting of submodels to predict irrigation schedule (water balance), irrigation design (surface irrigation hydraulics), and crop yield (yield function) under spatially and temporally variable conditions was developed and verified with the field data. The model was used to predict irrigation performance for each irrigation event during the season, soil moisture before each irrigation, seasonal evapotranspiration (ET), and bean yield along the furrow at 10-m intervals. In addition, measured inputs along the furrow, including heterogeneous infiltration, soil moisture, and yield were used in conjunction with the model to estimate mean (17.3%) and variation in available water-holding capacity (AWC) (15.4%-19.8%). Variation in crop yield represents an integrated effect of variability in infiltration, soil water characteristics, root depth, soil fertility, microclimate, fertilizer and pesticide applications, plants, and disease. Using the calibrated model, nearly 88% of the variance in ET estimated with the yield function was explained by simulated variation in infiltration characteristics, soil water-holding capacity, and root depth. By assuming homogeneous infiltration characteristics, soil water properties, and root depth, the average absolute error in seasonal ET increased by only 0.6 cm but the variance explained decreased to 30%. Although in absolute terms the impact of heterogeneity seems negligible, Raghuwanshi (1994) showed that heterogeneity strongly affected the optimal flow rate and irrigation time as well as net returns to water.
2 Raghuwanshi, N. S.; Wallender, W. W. 1997. Field-measured evapotranspiration as a stochastic process. Agricultural Water Management, 32(2):111-129.
Evapotranspiration ; Stochastic process ; Soil moisture ; Irrigation scheduling ; Irrigation requirements ; Furrow irrigation ; Beans (phaseolus) ; Water balance / USA / California
(Location: IWMI-HQ Call no: PER Record No: H020436)
3 Raghuwanshi, N. S.; Wallender, W. W. 1997. Economic optimization of furrow irrigation. Journal of Irrigation and Drainage Engineering, 123(5):377-385.
Irrigation management ; Furrow irrigation ; Soil moisture ; Hydraulics ; Simulation models ; Economic aspects ; Optimization ; Irrigation design ; Water balance ; Soil water ; Infiltration ; Evapotranspiration ; Beans (phaseolus) ; Crop yield ; Irrigation scheduling / USA / California
(Location: IWMI-HQ Call no: PER Record No: H021384)
4 Raghuwanshi, N. S.; Wallender, W. W. 1998. Optimization of furrow irrigation schedules, designs and net return to water. Agricultural Water Management, 35(3):209-226.
Furrow irrigation ; Optimization ; Design ; Infiltration ; Irrigation scheduling ; Mathematical models ; Simulation ; Water balance ; Evapotranspiration ; Soil moisture
(Location: IWMI-HQ Call no: PER Record No: H022295)
5 Raghuwanshi, N. S.; Wallender, W. W. 1998. Optimal furrow irrigation scheduling under heterogeneous conditions. Agricultural Systems, 58(1):39-55.
Furrow irrigation ; Irrigation scheduling ; Water demand ; Soil moisture ; Hydraulics ; Irrigation requirements ; Mathematical models ; Optimization ; Irrigation management / USA / California
(Location: IWMI-HQ Call no: PER Record No: H023091)
6 Raghuwanshi, N. S.; Wallender, W. W. 1998. Converting from pan evaporation to evapotranspiration. Journal of Irrigation and Drainage Engineering, 124(5):275-277.
(Location: IWMI-HQ Call no: PER Record No: H023163)
7 Ito, H.; Wallender, W. W.; Raghuwanshi, N. S.. 1999. Economics of furrow irrigation under partial infiltration information. Journal of Irrigation and Drainage Engineering, 125(3):105-111.
(Location: IWMI-HQ Call no: PER Record No: H024523)
8 Upadhyaya, S. K.; Raghuwanshi, N. S.. 1999. Semiempirical infiltration equation for furrow irrigation systems. Journal of Irrigation and Drainage Engineering, 125(4):173-178.
Furrow irrigation ; Infiltration ; Mathematical models ; Irrigation systems ; Simulation ; Irrigation management ; Tomatoes
(Location: IWMI-HQ Call no: PER Record No: H024737)
9 Raghuwanshi, N. S.; Wallender, W. W. 1999. Forecasting and optimizing furrow irrigation management decision variables. Irrigation Science, 19(1):1-6.
Furrow irrigation ; Forecasting ; Optimization ; Decision making ; Models ; Irrigation scheduling ; Infiltration ; Evapotranspiration
(Location: IWMI-HQ Call no: PER Record No: H025344)
10 George, B. A.; Shende, S. A.; Raghuwanshi, N. S.. 2000. Development and testing of an irrigation scheduling model. Agricultural Water Management, 46(2):121-136.
Irrigation scheduling ; Models ; Databases ; Soil water ; Water balance ; Soil moisture ; Irrigation efficiency ; Decision support tools ; Evapotranspiration ; Measurement ; Percolation ; Simulation ; Soil-water-plant relationships ; Crop yield ; Beans
(Location: IWMI-HQ Call no: PER Record No: H026847)
11 Schwankl, L. J.; Raghuwanshi, N. S.; Wallender, W. W. 2000. Time series modeling for predicting spatially variable infiltration. Journal of Irrigation and Drainage Engineering, 126(5):283-287.
(Location: IWMI-HQ Call no: PER Record No: H026873)
12 Mishra, A.; Anand, A.; Singh, R.; Raghuwanshi, N. S.. 2001. Hydraulic modeling of Kangsabati main canal for performance assessment. Journal of Irrigation and Drainage Engineering, 127(1):27-34.
Irrigation canals ; Operations ; Flow control ; Simulation models ; Hydraulics ; Distributary canals ; Performance evaluation ; Irrigation management / India / West Bengal / Kangsabati
(Location: IWMI-HQ Call no: PER Record No: H027917)
13 Sreevidya, M. L.; Mishra, A.; Singh, R.; Raghuwanshi, N. S.. 2000. Hydrological modeling of a major irrigation command using MIKE SHE. In Mehrotra, R.; Soni, B.; Bhatia, K. K. S. (Eds.), Integrated water resources management for sustainable development - Volume 1. Roorkee, India: National Institute of Hydrology. pp.700-710.
Irrigation programs ; Hydrology ; Simulation models ; Calibrations ; Irrigation canals ; Precipitation ; Water balance ; Groundwater ; Evapotranspiration ; Reservoirs ; Rain ; Topography ; Mapping ; Water table ; Sensitivity analysis / India / West Bengal / Kangsabati Irrigation Project
(Location: IWMI-HQ Call no: 333.91 G000 MEH Record No: H028086)
14 Kumar, P.; Mishra, A.; Raghuwanshi, N. S.; Singh, R. 2002. Application of unsteady flow hydraulic-model to a large and complex irrigation system. Agricultural Water Management, 54(1):49-66.
Simulation models ; Hydraulics ; Calibration ; Irrigation canals ; Networks ; Water delivery ; Irrigation programs ; Performance evaluation / India / West Bengal / Kangsabati Irrigation Project
(Location: IWMI-HQ Call no: PER Record No: H029523)
15 George, B. A.; Reddy, B. R. S.; Raghuwanshi, N. S.; Wallender, W. W. 2002. Decision support system for estimating reference evapotranspiration. Journal of Irrigation and Drainage Engineering, 128(1):1-10.
(Location: IWMI-HQ Call no: PER Record No: H029699)
16 Kumar, M.; Raghuwanshi, N. S.; Singh, R.; Wallender, W. W.; Pruitt, W. O. 2002. Estimating evapotranspiration using artificial neural network. Journal of Irrigation and Drainage Engineering, 128(4):224-233.
(Location: IWMI-HQ Call no: PER Record No: H030283)
17 Mishra, A.; Singh, R.; Raghuwanshi, N. S.. 2002. Alternative delivery scheduling for improved canal system performance. Journal of Irrigation and Drainage Engineering, 128(4):244-248.
Irrigation practices ; Irrigation scheduling ; Water delivery ; Irrigation canals ; Irrigation programs ; Water balance ; Simulation models ; Evapotranspiration ; Percolation ; Drainage ; Water demand / India / West Bengal / Kangsabati Irrigation Project
(Location: IWMI-HQ Call no: PER Record No: H030285)
18 George, B. A.; Raghuwanshi, N. S.; Singh, R. 2004. Development and testing of a GIS integrated irrigation scheduling model. Agricultural Water Management, 66(3):221-237.
GIS ; Simulation models ; Irrigation scheduling ; Irrigation requirements ; Rice ; Evapotranspiration ; Soil water ; Water balance ; Irrigation programs / India / West Bengal / Kangsabati Irrigation Project / Tarafeni South Main Canal
(Location: IWMI-HQ Call no: PER Record No: H034449)
19 Mishra, A.; Singh, R.; Raghuwanshi, N. S.. 2005. Development and application of an integrated optimization-simulation model for major irrigation projects. Journal of Irrigation and Drainage Engineering, 131(6):504-513.
Simulation models ; Optimization ; Irrigation practices ; Irrigation canals ; Irrigation programs / India / West Bengal / Kangsabati Irrigation Project
(Location: IWMI-HQ Call no: PER Record No: H038490)
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