Your search found 5 records
1 Liu, F.; Feyen, J.; Berlamont, J. 1992. Computation method for regulating unsteady flow in open channels. Journal of Irrigation and Drainage Engineering, 118(10):674-689.
(Location: IWMI-HQ Call no: PER Record No: H011292)
2 ElZeir, M.; Monbaliu, J.; Berlamont, J.. 1992. Comments on an heuristic approach for pipe network design optimization. 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.297-306.
Pipes ; Optimization ; Design ; Mathematical models ; Water distribution ; Computer techniques ; Simulation
(Location: IWMI-HQ Call no: 631.7.1 G000 FEY Record No: H014358)
The program PIPE-NET codes an heuristic algorithm. The program has the merits of user friendly interface, easy data input and capability of designing as well as simulating networks. The algorithm can deal with a discrete set of candidate pipes. It uses the simple principle of balance between the energy cost and the pipe cost. The principle is formulated in the Marginal Energy Critical Link technique defined by Rasmusen (1976). However, some shortcomings of this algorithm were observed. The optimal solution of the algorithm is dependent on the initial solution. Its condition to increase the diameters of the pipes, during design, is not so well understood. This condition is replaced by another condition which gives better results. The application of the Marginal Energy Cost concept to the constant level reservoirs has to be validated. The concept of forcing all nodes to be critical is introduced and linked to the algorithm. The modified algorithm tends to reduce the looped system to a tree-like system. The modifications, however, are not sufficient to eliminate all redundancy of the pipes. This is probably the most important reason why different initial feasible solutions may give different final "optimal" solutions. Ultimately, the redundancy should be included in a reliability measure within the algorithm.
3 Liu, F.; Feyen, J.; Berlamont, J.. 1994. Downstream control algorithm for irrigation canals. Journal of Irrigation and Drainage Engineering, 120(3):468-483.
(Location: IWMI-HQ Call no: PER Record No: H014410)
A downstream control algorithm for on-demand operation of irrigation canal system is presented. A constant water level is maintained at the downstream end of the pool. The approach is based on an explicit finite-difference solution procedure of the St. Venant equations. The upstream gate settings are corrected according to the water level and the flow rate at the information nodes along the canal. The method is illustrated for the control of a canal pool bounded by an upstream gate and a downstream gate or pump. The effectiveness of the control has been tested using an unsteady-flow simulation model that is based on the complete St. Venant equations and the implicit Preissmann scheme. The simulation results show that the proposed control method can cope with rapid variations of water demand and unknown disturbances in the system. The influence of the number of information nodes and assessment of the physical parameters of the system on the response of the system has been investigated. Unless the estimated physical parameters of the system are too far from their actual values, an effective control can be achieved by measuring the water level and estimating the flow rate only at the most upstream and downstream ends of the pool.
4 Liu, F.; Feyen, J.; Berlamont, J.. 1992. Prescribed transient control in series channel. 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. 2. Leuven, Belgium: Center for Irrigation Engineering. pp.495-503.
(Location: IWMI-HQ Call no: 631.7.1 G000 FEY Record No: H014430)
5 Liu, F.; Feyen, J.; Berlamont, J.. 1995. Downstream control of multireach canal systems. Journal of Irrigation and Drainage Engineering, 121(2):179-190.
(Location: IWMI-HQ Call no: PER Record No: H016375)
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