Specifications

wetland to farmland areal ratio of 10.5% during the irrigation season due to recharges from canal
seepage and field percolation; and 45% of the wetland area remains as the permanent pool area
during the non-irrigation season. The observed maximum water table rise in the irrigation season
is 1.5. m. The current irrigation system efficiency in YNID is 0.30, which is a product of the field
level efficiency of 0.68 and the conveyance efficiency of 0.44. Our analysis presented in this paper
shows that improving the application efficiency to 0.90 at the field level will reduce the maximum
water table rise by 0.53. m, causing the wetland area to shrink by 17% and the subsequent
wetland water consumption to decrease by 11%; further improving conveyance efficiency to 0.60
will reduce the maximum water table rise by 0.95. m, causing the wetland area to shrink by 30%
and the subsequent wetland water consumption to decrease by 19%. These results indicate that
water saving at the conveyance level will have greater impact on wetland water use than that at
the field level. If wetland water consumption is considered as efficient use, this fraction of the
irrigation water loss becomes efficient use, which will increase the system efficiency
proportionally by the percentage of wetland water consumption. The amount of wetlands, and
thus additional beneficial wetland water use, is directly dependent on the amount of traditional
water losses, such as wetland consumption here. The key question then becomes: where lies the
optimum level or the acceptable balance between increasing efficiencies at irrigation scheme
level while providing optimal beneficial use for wetlands. © 2013 Elsevier B.V.
Number of references: 20
Main heading: Wetlands
Controlled terms: Efficiency - Groundwater - Irrigation - Pollution control -
Reservoirs (water) - River diversion - Solvents - Water conservation - Water
pollution - Water resources - Water supply
Uncontrolled terms: Conveyance level - Field level - Irrigation efficiency - Water -
savings - Water loss
Classification code: 913.1 Production Engineering - 821.3 Agricultural Methods - 803
Chemical Agents and Basic Industrial Chemicals - 454.2 Environmental Impact and Protection
- 453 Water Pollution - 446.1 Water Supply Systems - 444.2 Groundwater - 444
Water Resources - 442.2 Land Reclamation - 441.2 Reservoirs - 441 Dams and
Reservoirs; Hydro Development
DOI: 10.1016/j.agwat.2013.01.003
Database: Compendex
Compilation and indexing terms, © 2013 Elsevier Inc.
5.
Accession number: 20130916053447
Title: Experimental study on the flow of a mixed flow pump impeller
Authors: Lu, J.L.1, 2 ; Guo, P.C.1, 2 ; Feng, J.J.1, 2 ; Luo, X.Q.1, 2/卢金玲;郭鹏程;;罗兴锜
Author affiliation: 1 Institute of Water Resources and Hydro-Electric Engineering, Xi'An
University of Technology, No.5 South Jinhua Road, Xi'an 710048, China
2 FINE Institute for Hydraulic Machinery, Huaxing Times Plaza, No.478 Wensan Rd, Hangzhou
310013, China
Corresponding author: Lu, J.L.
Source title: IOP Conference Series: Earth and Environmental Science
Abbreviated source title: IOP Conf. Ser. Earth Environ. Sci.