Journal cover Journal topic
Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/hess-2016-525
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
12 Oct 2016
Review status
This discussion paper is under review for the journal Hydrology and Earth System Sciences (HESS).
Indicators of Necessary Storages for Flood and Drought Management: Towards Global Maps
Kuniyoshi Takeuchi1 and Muhammad Masood2 1International Centre for Water Hazard and Risk Management (ICHARM), Public Works Research Institute (PWRI), Tsukuba, 305-8516, Japan
2Bangladesh Water Development Board (BWDB), Dhaka, Bangladesh
Abstract. Storage is the only means to smooth out the discharge variation necessary to control hazards and utilize water resources. Necessary storage depends on the levels of discharge variation, required flood control and water use. The main methodologies to calculate necessary storage include mass curve method and simulation. The use of flood duration curve (FDC) and drought duration curve (DDC) that this paper presents is an alternative way that has considerable advantages over the others. The diagram of FDC-DDC serves as the classification indicator of basin hydrology and the FDC-DDC based estimates of necessary storages can be used for reservoir operation. The FDC-DDC based necessary storages pay an attention to the finite term hydrological variation rather than the asymptotic infinite memory of variation that Range analysis focuses. On the other hand the FDC-DDC focus on spatial distribution of necessary storages and try to find spatial rules of hydrological heterogeneity in necessary storages. For a case study, the Ganges-Brahmaputra-Meghna basin was selected and its spatial distribution of the FDC–DDC based necessary storages was calculated based on the discharge dataset obtained by hydrological simulation of the MRI-AGCM3.2S projections using the hydrological model BTOPMC developed at University of Yamanashi and ICHARM. The spatial distribution of necessary storages indicate the relative difficulty of managing the temporal variation of river discharges for human use at respective locality. The climate change impacts on the necessary storages were analysed and found the increase in difficulty of managing high flows and the general ease of managing low flows. But local differences were rather large that indicates the need of careful study to respond unique spatial structure of local discharge variation. The relation to catchment area was also analysed and found such regional heterogeneity diminishes into a basin average slowly in several 10,000 km2. A representative elementary area of necessary storages for discharge smoothing is a new concept that deserves for further study. A creation of global maps would be a useful challenge for assessment of current state of water resources, climate change impact on water resources and for study of hydrological heterogeneity and its scale effect.

Citation: Takeuchi, K. and Masood, M.: Indicators of Necessary Storages for Flood and Drought Management: Towards Global Maps, Hydrol. Earth Syst. Sci. Discuss., doi:10.5194/hess-2016-525, in review, 2016.
Kuniyoshi Takeuchi and Muhammad Masood
Kuniyoshi Takeuchi and Muhammad Masood
Kuniyoshi Takeuchi and Muhammad Masood

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Short summary
There are many global maps of climate change impacts but none on the changes of necessary storages for flood and drought management. This paper provides a methodology to create such a map taking a Ganges-Brahmaputra-Meghna basin as an example. The necessary storages are calculated by a new method, intensity-duration-frequency curves of flood and drought (FDC-DDC). Their geographical distribution shows the hydrological heterogeneity in a storage domain, a new area of hydrological sciences.
There are many global maps of climate change impacts but none on the changes of necessary...
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