Your search found 15 records
1 Homan, D. M.; Skold, M. D.; Heermann, D. F.. 1987. Monitoring and control of center pivot systems with microcomputers. Water Resources Bulletin, 23(5):903-909.
(Location: IWMI-HQ Call no: PER Record No: H02823)
2 Heermann, D. F.; Kohl, R. A. 1983. Fluid dynamics of sprinkler systems. In Jensen, M. E. (Ed.), Design and operation of farm irrigation systems. St. Joseph, MI, USA: ASAE. pp.583-618. (ASAE monograph no.3)
Sprinkler irrigation ; Pipes ; Soil water relations ; Evaporation ; Environmental effects ; Design criteria
(Location: IWMI-HQ Call no: 631.7.1 G000 JEN Record No: H03209)
3 Heermann, D. F.. 1985. Evapotranspiration in irrigation management. In American Society of Agricultural Engineers, Advances in evapotranspiration: Proceedings of the National Conference on Advances in Evapotranspiration, Chicago, Illinois, 16-17 December 1985. St. Joseph, MI, USA: ASAE. pp.323-334. (ASAE publication 14-85)
Evapotranspiration ; Irrigation management ; Irrigation systems ; Design ; Irrigation scheduling ; Water supply ; Models
(Location: IWMI-HQ Call no: 631.7.5 G000 AME Record No: H03348)
4 Klocke, N. C.; Martin, D. C.; Heermann, D. F.. 1985. Soil evaporation and plant transpiration from irrigated crops. In American Society of Agricultural Engineers, Advances in evapotranspiration: Proceedings of the National Conference on Advances in Evapotranspiration, Chicago, Illinois, 16-17 December 1985. St. Joseph, MI, USA: ASAE. pp.335-341. (ASAE publication 14-85)
(Location: IWMI-HQ Call no: 631.7.5 G000 AME Record No: H03349)
5 Harrington, G. J.; Heermann, D. F.. 1981. State of the art scheduling computer program. In American Society of Agricultural Engineers, Irrigation scheduling for water and energy conservation in the 80's. St. Joseph, MI, USA: ASAE. pp.171-178. (ASAE publication 23-81)
(Location: IWMI-HQ Call no: 631.7.1 G000 AME Record No: H03384)
6 Ahmad, S.; Heermann, D. F.. 1989. Irrigation scheduling and water availability at water course command. Irrigation and Drainage Systems, 3(2):193-203.
(Location: IWMI-HQ Call no: PER Record No: H05783)
7 Heermann, D. F.; Duke, H. R.; Buchleiter, G. W. 1988. Computer control of center pivot irrigation systems in Colorado and Oregon. In Proceedings of the International Conference on Irrigation System Evaluation and Water Management, Wuhan, China, 12-16 September 1988: Vols.1 & 2. Wuhan, China: Wuhan University of Hydraulic and Electrical Engineering. pp.991-1003.
Call no: 631.7.8 G000 PRO Record No: H06730)
8 Ahmad, S.; Heermann, D. F.. 1992. Management strategies for scheduling irrigation: Wheat and corn. ICID Bulletin, 41(2):111-126.
(Location: IWMI-HQ Call no: PER Record No: H012573)
9 Heermann, D. F.; Duke, H. R. 1992. Effective irrigation depth as a function of uniformity. In Feyen, J.; Mwendera, E.; Badji, M. (Eds.), Advances in planning, design and management of irrigation systems as related to sustainable land use: Proceedings of an International Conference organized by the Center for Irrigation Engineering of the Katholieke Universiteit Leuven in cooperation with the European Committee for Water Resources Management, Leuven, Belgium, 14-17 September 1992. Vol. 1. Leuven, Belgium: Center for Irrigation Engineering. pp.329-338.
Sprinkler irrigation ; Water control ; Water distribution ; Infiltration ; Simulation ; Evaluation ; Irrigation efficiency ; Irrigation requirements ; Mathematical models ; Cost benefit analysis / USA
(Location: IWMI-HQ Call no: 631.7.1 G000 FEY Record No: H014362)
The center pivot irrigator is faced with a problem of determining the appropriate depth of water application to use for management purposes to minimize both yield loss and water quality degradation. The distribution of irrigation depths of center-pivot systems often is evaluated with the Christiansen Uniformity coefficient. This single coefficient compares systems but does not provide a functional relationship of the variation of applied depths. The analysis of deficit and excess irrigation amounts requires a distribution function. The normal distribution function was found to describe field catch-can tests of center-pivot systems. The current study builds on the work of Peri, Hart, and Norum ('Optimal irrigation depths - A method of analysis.'. J. Irrig. and Drg. Div., ASCE 105(IR4):341-355. 1979), using the normal distribution of application depth and linear yield and economic functions to calculate the appropriate depth of application with known uniformity and user specified economic conditions. The potential savings from improving the uniformity is estimated. The optimum applied depths for center pivot systems vary from 0.6 to 1.5 times the mean depth depending on the system uniformity and management objectives.
10 Fraisse, C. W.; Heermann, D. F.; Duke, H, R. 1992. Modified linear move system for experimental water application. In Feyen, J.; Mwendera, E.; Badji, M. (Eds.), Advances in planning, design and management of irrigation systems as related to sustainable land use: Proceedings of an International Conference organized by the Center for Irrigation Engineering of the Katholieke Universiteit Leuven in cooperation with the European Committee for Water Resources Management, Leuven, Belgium, 14-17 September 1992. Vol. 1. Leuven, Belgium: Center for Irrigation Engineering. pp.367-376.
Research ; Water distribution ; Irrigation equipment ; Flow regulators ; Sprinkler irrigation ; Mathematical models ; Monitoring ; Crop-based irrigation
(Location: IWMI-HQ Call no: 631.7.1 G000 FEY Record No: H014366)
The use of linear move system for experimental water application requires a control much more sophisticated than one for normal field operations. The problem increases in complexity when the field irrigated is divided into small research plots in both advance and lateral directions. The current study investigates the application of the concept of pulse irrigation as a way to apply the different water treatments required in a research field. A laboratory setup was built in which solenoid valves are used to control the flow to each spray head or set of spray heads. Results have shown that pulse irrigation is feasible with commercially available solenoid valves and that water distribution patterns are minimally affected by pulsing the system. They also show that the frequency of operation is limited by the valve's response time which can vary for the different brands and models available in the market.
11 Heermann, D. F.; Duke, H. R.; Buchleiter, G. W. 1994. Irrigation systems in transition: Center pivots and linear moves. Irrigation Journal, 44(2):16-20, 22-23.
Sprinkler irrigation ; Irrigation systems ; Irrigation equipment ; Irrigation management ; Automation / USA
(Location: IWMI-HQ Call no: PER Record No: H014689)
12 Heermann, D. F.; Wallender, W. W.; Bos, M. G. 1990. Irrigation efficiency and uniformity. In Hoffman, G. J.; Howell, T. A.; Solomon, K. H. (Eds.), Management of farm irrigation systems. St. Joseph, MI, USA: ASAE. pp.125-149.
Irrigation efficiency ; River basins ; Models ; Water conveyance ; Water loss ; Seepage ; Surface irrigation ; Infiltration ; Sprinkler irrigation ; Irrigation systems ; Small scale systems ; Crop production
(Location: IWMI-HQ Call no: 631.7.8 G000 HOF Record No: H018308)
13 Buchleiter, G. W.; Heermann, D. F.; Duke, H. R. 1995. Automation of variable irrigation water and chemical applications. In Clean water - Clean environment - 21st century: Team agriculture - Working to protect water resources: Conference proceedings, March 5-8, 1995, Kansas City, Missouri. Volume III: Practices, systems and adoption. St. Joseph, MI, USA: ASAE. pp.49-52.
(Location: IWMI-HQ Call no: 333.91 G000 CLE Record No: H018785)
14 Buchleiter, G. W.; Heermann, D. F.; Wenstrom, R. J. 1996. Economic analysis of on-farm irrigation scheduling. In Camp, C. R.; Sadler, E. J.; Yoder, R. E. (Eds.), Evapotranspiration and irrigation scheduling: Proceedings of the International Conference, November 3-6, 1996, San Antonio Convention Center, San Antonio, Texas. St. Joseph, MI, USA: ASAE. pp.986-991.
Irrigation scheduling ; Sprinkler irrigation ; Computer software ; Soil water ; Water budget ; Soyabeans ; Maize ; Economic analysis / USA / Kansas
(Location: IWMI-HQ Call no: 631.7.1 G000 CAM Record No: H020692)
15 Neale, C. M. U.; Bausch, W. C.; Heermann, D. F.. 1989. Development of reflectance-based crop coefficients for corn. Transactions of the ASAE, 32(6):1891-1899.
(Location: IWMI-HQ Call no: P 6627 Record No: H033419)
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