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Understanding Hydrological Variability for Improved Water Management in the Semi-Arid Karkheh Basin, Iran - UNESCO-IHE PhD Thesis (Hardcover)
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Understanding Hydrological Variability for Improved Water Management in the Semi-Arid Karkheh Basin, Iran - UNESCO-IHE PhD Thesis (Hardcover)
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This study provides a hydrology based assessment of (surface) water
resources and its continuum of variability and change at different
spatio-temporal scales in the semi-arid Karkheh Basin, Iran, where
water is scarce, competition among users is high and massive water
resources development is under way. The study reveals that the
ongoing allocation planning is not sustainable and essentially
requires reformulation, with consideration of spatio-temporal
variability and observed trends in the streamflows regarding flood
intensification and decline in low flows. The development of
innovative methods for quantification of the hydrological fluxes
(i.e., regionalization of model parameters based on similarity of
the flow duration curve and the use of areal precipitation input in
the hydrological modeling) helped better understanding and modeling
the basin hydrology. The investigation of scenarios for upgrading
rain-fed areas to irrigated agriculture, using SWAT, recommends the
promotion of in-situ soil and water conservation techniques.
Conversion of rain-fed areas to irrigation causes significant
reduction in the downstream flows, and requires additional
considerations such as less development in the upper catchments,
practicing supplementary irrigation and developing water storage.
The knowledge generated is instructive for hydrological assessment
and its use in water resources planning and management in the river
basin context.
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