A new technique to estimate net groundwater use across large irrigated areas by combining remote sensing and water balance approaches, Rechna Doab, Pakistan
Over-exploitation of groundwater resources threatens the future of irrigated agriculture, especially in the arid and semi-arid regions of the world. In order to reverse this trend, and to ensure future food security, the achievement of sustainable groundwater use is ranking high on the agenda of water policy makers. Spatio-temporally distributed information on net groundwater use? i.e. the difference between tubewell withdrawals for irrigation and net recharge?is often unknown at the river basin scale. Conventionally, groundwater use is estimated from tubewell inventories or phreatic surface fluctuations. There are shortcomings related to the application of these approaches. An alternative methodology for computing the various water balance components of the unsaturated zone by using geo-information techniques is provided in this paper. With this approach, groundwater recharge will not be quantified explicitly, but is part of net groundwater use, and the spatial variation can be quantitatively described. Records of routine climatic data, canal discharges at major offtakes, phreatic surface depth fluctuations, and simplified information on soil textural properties are required as input data into this new Geographic Information System and Remote Sensing tool. The Rechna Doab region (approximately 2.97 million ha), located in the Indus basin irrigation system of Pakistan, has been used as a case study. On an annual basis, an areal average net groundwater use of 82 mm year1 was estimated. The current result deviates 65% from the specific yield method. The deviation from estimates using tubewell withdrawal related data is even higher.
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| Format: | Journal Article biblioteca |
| Language: | English |
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2005
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| Subjects: | groundwater management, estimation, remote sensing, gis, water balance, water use, recharge, irrigation management, sustainability, |
| Online Access: | https://hdl.handle.net/10568/40981 |
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dig-cgspace-10568-409812023-02-15T12:14:53Z A new technique to estimate net groundwater use across large irrigated areas by combining remote sensing and water balance approaches, Rechna Doab, Pakistan Ahmad, Mobin-ud-Din Bastiaanssen, Wim G.M. Feddes, R.A. groundwater management estimation remote sensing gis water balance water use recharge irrigation management sustainability Over-exploitation of groundwater resources threatens the future of irrigated agriculture, especially in the arid and semi-arid regions of the world. In order to reverse this trend, and to ensure future food security, the achievement of sustainable groundwater use is ranking high on the agenda of water policy makers. Spatio-temporally distributed information on net groundwater use? i.e. the difference between tubewell withdrawals for irrigation and net recharge?is often unknown at the river basin scale. Conventionally, groundwater use is estimated from tubewell inventories or phreatic surface fluctuations. There are shortcomings related to the application of these approaches. An alternative methodology for computing the various water balance components of the unsaturated zone by using geo-information techniques is provided in this paper. With this approach, groundwater recharge will not be quantified explicitly, but is part of net groundwater use, and the spatial variation can be quantitatively described. Records of routine climatic data, canal discharges at major offtakes, phreatic surface depth fluctuations, and simplified information on soil textural properties are required as input data into this new Geographic Information System and Remote Sensing tool. The Rechna Doab region (approximately 2.97 million ha), located in the Indus basin irrigation system of Pakistan, has been used as a case study. On an annual basis, an areal average net groundwater use of 82 mm year1 was estimated. The current result deviates 65% from the specific yield method. The deviation from estimates using tubewell withdrawal related data is even higher. 2005 2014-06-13T14:48:59Z 2014-06-13T14:48:59Z Journal Article Ahmad, Mobin-ud-Din; Bastiaanssen, W. G. M.; Feddes, R. A. 2005. A new technique to estimate net groundwater use across large irrigated areas by combining remote sensing and water balance approaches, Rechna Doab, Pakistan. Hydrogeology Journal, 13:653-664. https://hdl.handle.net/10568/40981 en Limited Access |
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groundwater management estimation remote sensing gis water balance water use recharge irrigation management sustainability groundwater management estimation remote sensing gis water balance water use recharge irrigation management sustainability |
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groundwater management estimation remote sensing gis water balance water use recharge irrigation management sustainability groundwater management estimation remote sensing gis water balance water use recharge irrigation management sustainability Ahmad, Mobin-ud-Din Bastiaanssen, Wim G.M. Feddes, R.A. A new technique to estimate net groundwater use across large irrigated areas by combining remote sensing and water balance approaches, Rechna Doab, Pakistan |
| description |
Over-exploitation of groundwater resources threatens the future of irrigated agriculture, especially in the arid and semi-arid regions of the world. In order to reverse this trend, and to ensure future food security, the achievement of sustainable groundwater use is ranking high on the agenda of water policy makers. Spatio-temporally distributed information on net groundwater use? i.e. the difference between tubewell withdrawals for irrigation and net recharge?is often unknown at the river basin scale. Conventionally, groundwater use is estimated from tubewell inventories or phreatic surface fluctuations. There are shortcomings related to the application of these approaches. An alternative methodology for computing the various water balance components of the unsaturated zone by using geo-information techniques is provided in this paper. With this approach, groundwater recharge will not be quantified explicitly, but is part of net groundwater use, and the spatial variation can be quantitatively described. Records of routine climatic data, canal discharges at major offtakes, phreatic surface depth fluctuations, and simplified information on soil textural properties are required as input data into this new Geographic Information System and Remote Sensing tool. The Rechna Doab region (approximately 2.97 million ha), located in the Indus basin irrigation system of Pakistan, has been used as a case study. On an annual basis, an areal average net groundwater use of 82 mm year1 was estimated. The current result deviates 65% from the specific yield method. The deviation from estimates using tubewell withdrawal related data is even higher. |
| format |
Journal Article |
| topic_facet |
groundwater management estimation remote sensing gis water balance water use recharge irrigation management sustainability |
| author |
Ahmad, Mobin-ud-Din Bastiaanssen, Wim G.M. Feddes, R.A. |
| author_facet |
Ahmad, Mobin-ud-Din Bastiaanssen, Wim G.M. Feddes, R.A. |
| author_sort |
Ahmad, Mobin-ud-Din |
| title |
A new technique to estimate net groundwater use across large irrigated areas by combining remote sensing and water balance approaches, Rechna Doab, Pakistan |
| title_short |
A new technique to estimate net groundwater use across large irrigated areas by combining remote sensing and water balance approaches, Rechna Doab, Pakistan |
| title_full |
A new technique to estimate net groundwater use across large irrigated areas by combining remote sensing and water balance approaches, Rechna Doab, Pakistan |
| title_fullStr |
A new technique to estimate net groundwater use across large irrigated areas by combining remote sensing and water balance approaches, Rechna Doab, Pakistan |
| title_full_unstemmed |
A new technique to estimate net groundwater use across large irrigated areas by combining remote sensing and water balance approaches, Rechna Doab, Pakistan |
| title_sort |
new technique to estimate net groundwater use across large irrigated areas by combining remote sensing and water balance approaches, rechna doab, pakistan |
| publishDate |
2005 |
| url |
https://hdl.handle.net/10568/40981 |
| work_keys_str_mv |
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| _version_ |
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