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water losses in Arid and Semi-Arid Zone:Evaporation, Evapotranspiration and Seepage

Journal of Mountain Science 2012年第2期9卷 256-261页

作者： MUPENZI Jean de la Paix LI Lanhai GE Jiwen NGAMIJE Jean ACHAL Verenyam HABIYAREMYE Gabriel HABUMUGISHA Jean de Dieu State Key laboratory of Desert and Oasis Ecology Xinfiang Institute of Ecologg and Geography Chinese Academy of Sciences 818 Beijing road south Urumqi Xinjiang 830011 China China University ofGeosciences （Wuhan） 388 Lumo Road Wuhan 430074 Hubei China Independent Institute of Lay Adventists ofKigali （INILAK） P O Box 6392 Kigali-Rwanda Institut Polytechnique de Byumba （IPB） PO Box 25 Byumba Rwanda

The primary purpose of this study was to assess water losses by evapotranspiration, evaporation and seepage in arid ***, evaporation and seepage are the main causes of water *** modeling water losses,a combination of Genetic Programming(GP),Penman-Monteith(PM) and Penman combination model for measurement of evapotranspiration,evaporation and seepage has been *** results were found to be varying depending on how the evaporation and seepage phenomena are *** results show that that there is an improvement in reducing evapotranspiration,evaporation and seepage losses in arid and semi-arid region.

关键词： Arid zone Evaporation Evapotranspiration Seepage water losses China

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A systematic approach for estimating water losses in irrigation canals

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water Science and Engineering 2022年第2期15卷 161-169页

作者： Soroush Barkhordari S.Mehdy Hashemy Shahdany Department of water Engineering College of AburaihanUniversity of TehranTehran ***Iran Department of Biosystems and Agricultural Engineering Oklahoma State UniversityStillwaterOK 74075USA

In order to determine water losses in irrigation canals,a systematic approach was developed,consisting of two main components:a seepage simulation model and a hydraulic simulation *** SEEP/W module of the Geo-Studio software was used to simulate the seepage rate,and the Hydrologic Engineering Center-River Analysis System(HEC-RAS)hydrodynamic model was used for hydraulic *** operation scenarios were designed to investigate all possible situations in daily operation of water distribution and delivery *** seepage simulation results show that the seepage losses were higher at the bottom and corners of the canal,because the hydraulic gradient was affected by the hydraulic *** hydraulic simulation results show that due to physical and management infrastructure(using non-automated and operator-based regulation structures),operational losses accounted for a significant volume of losses compared to seepage *** most operation scenarios,the maximum seepage loss was 10%,and the remaining 90%was related to operational *** is concluded that any factor(decrease or increase of inflow to the canal)that causes an increase or decrease of operational losses is ultimately a determining factor in reducing or increasing total ***,management approaches should be adopted to improve performance of the system and reduce losses,especially operational losses,by improving the operation methods of water level regulation and off-take structures.

关键词： Seepage modeling Hydraulic simulation Operational performance evaluation water losses Operating system

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