Show simple item record

dc.contributor.authorNdehedehe, C.
dc.contributor.authorAwange, Joseph
dc.contributor.authorKuhn, Michael
dc.contributor.authorAgutu, N.
dc.contributor.authorFukuda, Y.
dc.date.accessioned2017-11-24T05:24:50Z
dc.date.available2017-11-24T05:24:50Z
dc.date.created2017-11-24T04:48:51Z
dc.date.issued2017
dc.identifier.citationNdehedehe, C. and Awange, J. and Kuhn, M. and Agutu, N. and Fukuda, Y. 2017. Analysis of hydrological variability over the Volta river basin using in-situ data and satellite observations. Journal of Hydrology: Regional Studies. 12: pp. 88-110.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/58266
dc.identifier.doi10.1016/j.ejrh.2017.04.005
dc.description.abstract

© 2017 The AuthorsBy combining satellite altimetry with Gravity Recovery and Climate Experiment derived terrestrial water storage-TWS (2002–2014), this study used a two-step procedure based on spherical harmonic synthesis and statistical decomposition to support the understanding of the Volta basin's natural hydrology and its freshwater systems. Results indicate that Lake Volta contributed 41.6% to the observed increase in TWS over the basin during the 2002–2014 period. The statistical decomposition of TWS over the basin (after removing the Lake's water storage) resulted in a statistically significant (a = 0.05) loss of 59.5 ± 8.5 mm/yr of TWS in the lower Volta region of the basin between 2007 and 2011. This trend is attributed to a base flow recession resulting from the negative trends in precipitation around the lower Volta (2002–2014) and limited river flows of the Volta river system. While it also coincides with observed decline in net precipitation (-15 mm/yr), the long dry periods in the basin (2001–2007) also contributed to this storage depletion. The Lake Volta shows sensitivity to incoming flows of the Volta river system with a lag spanning between less than one and up to two years. In addition to this, a 4–5 year cycle in the clustering of dry and wet periods resulting from the impact of climate variability on the basin was noticed.

dc.titleAnalysis of hydrological variability over the Volta river basin using in-situ data and satellite observations
dc.typeJournal Article
dcterms.source.volume12
dcterms.source.startPage88
dcterms.source.endPage110
dcterms.source.issn2214-5818
dcterms.source.titleJournal of Hydrology: Regional Studies
curtin.departmentDepartment of Spatial Sciences
curtin.accessStatusOpen access via publisher


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record