Enhancing water productivity at the irrigation system level: a geospatial hydrology application in the Yellow River Basin

Khan, Shahbaz and Hafeez, Mohsin and Rana, Tariq and Mushtaq, Shahbaz (2008) Enhancing water productivity at the irrigation system level: a geospatial hydrology application in the Yellow River Basin. Journal of Arid Environments, 72. pp. 1046-1063. ISSN 0140-1963

Abstract

This paper provides results of an application of a holistic systematic approach of water accounting using remote sensing and GIS coupled with groundwater modeling to evaluate water saving options by tracking non-beneficial evaporation in the Liuyuankou Irrigation System (LIS) of China. Groundwater rise is a major issue in the LIS, where ground-water levels have risen alarmingly close to the ground surface (within 1m) near the Yellow River. The lumped water balance analysis showed high fallow evaporation losses and which need to be reduced for improving water productivity. The seasonal actual evapotranspiration (ETs) was estimated by applying the SEBAL algorithm for 18 NOAA AVHRR-12 images over the year of 1990–1991 (April 1990–March 1991). This analysis was aided by the unsupervised land use classification applied to three Landsat 5 TM images of the study area. SEBAL results confirmed that a fair amount (116.7MCM) of water can be saved by reducing evaporation from fallow land which will result in improved water productivity at the irrigation system. The water accounting indicator (for the analysis period) shows that the process fraction per unit of depleted water (PFdepleted) is 0.52 for LIS, meaning that 52% of the depleted water is consumed by agricultural crops and 48% is lost through non-process depletion. Finally, the groundwater modeling was applied to simulate three land use and water management interventions to assess their effectiveness for both water savings and impact on the groundwater in LIS. MODFLOW’s Zone Budget code calculates the groundwater budget of user-specified subregions, the exchange of flows between subregions and also calculates a volumetric water budget for the entire model at the end of each time step. The simulation results showed that fallow evaporation could be reduced between 14.2% (25.51MCM) and 45.3% (81.36MCM) by interventions such as canal lining and groundwater pumping. The reduction in non-beneficial ETs volumes would mean that more water would beavailable for other uses and it would allow the intro-duction of more surface water supplies in the area through improved water management strategies. This will ultimately lead to improved water productivity of the LIS system.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author version not held.
Depositing User: Dr Shahbaz Mushtaq
Faculty / Department / School: Current - USQ Other
Date Deposited: 29 Apr 2010 01:49
Last Modified: 02 Jul 2013 23:47
Uncontrolled Keywords: fallow evaporation; groundwater modeling; system level; water productivity; remote sensing; China
Fields of Research (FOR2008): 07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070104 Agricultural Spatial Analysis and Modelling
09 Engineering > 0909 Geomatic Engineering > 090905 Photogrammetry and Remote Sensing
07 Agricultural and Veterinary Sciences > 0799 Other Agricultural and Veterinary Sciences > 079901 Agricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc.)
Socio-Economic Objective (SEO2008): B Economic Development > 91 Economic Framework > 9199 Other Economic Framework > 919999 Economic Framework not elsewhere classified
D Environment > 96 Environment > 9609 Land and Water Management > 960999 Land and Water Management of Environments not elsewhere classified
Identification Number or DOI: doi: 10.1016/j.jaridenv.2007.11.011
URI: http://eprints.usq.edu.au/id/eprint/7491

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