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University of East Anglia (2005)

Climate change and water use for irrigation : a case study in the Gassim area of Saudi Arabia

Almisnid, Abdullah.

Titre : Climate change and water use for irrigation : a case study in the Gassim area of Saudi Arabia

Auteur : Almisnid, Abdullah.

Université de soutenance : University of East Anglia

Grade : Doctor of Philosophy (Ph.D.) : 2005

Résumé
This thesis describes an assessment of the sensitivity of water use in irrigation to climate change in the Gassim area of Saudi Arabia, one of the most important agricultural areas in the kingdom. The thesis examines observed climate variability (1971-2000). Changes in temperature, relative humidity, wind speed and sunshine duration are used to calculate future changes in ET0 and CWR for wheat. Observed temperature in Gassim (1971-2000) shows a positive trend with a rate of warming of 0.55oC and an increase in DTR (0.30oC/decade). The average annual rainfall is 92 mm, there is a slight positive trend in rainfall, and the average rate of increase is 3mm/decade. Records of groundwater levels in the region highlight a sustained rapid decline during the last 20 years. Fieldwork results examine the actual water applied (AWA) and the relative productivity for wheat. ET0 and CWR are estimated based on the FAO approach for the observed climate, and comparisons are made between these and AWA. Climate change scenarios are presented for Saudi Arabia, and Gassim, using the outputs of the three GCMs with two emissions scenarios (A2, high, and B2, low). Warming by the 2020s, in comparison to the baseline climate, is between 1oC and 1.5oC, and by the 2080s, the range is between 3.2oC and 4.9oC, in terms of rainfall, there is no significant change (annual changes range from -1.7 to 14.9% and from -9.4 to 17.4% in the 2020s and 2080s, respectively). ET0 and CWR are projected to increase by about 3% by the 2020s, and by about 12% (A2) and 9% (B2) by the 2080s. A small increase in temperature such as 1oC could result in an increase in CWR of about 103 m3/ha/season for wheat in Gassim.

Présentation : EThOS (UK)

Accès au document : Proquest Dissertations & Theses

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