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Comparative assessment of spatial variability and trends of flows and sediments under the impact of climate change in the upper Indus basin

Ul Hussan, W.; Shahzad, M. K.; Seidel, F.; Costa, A.; Nestmann, F.

Abstract (englisch):
Extensive research of the variability of flows under the impact of climate change has been conducted for the Upper Indus Basin (UIB). However, limited literature is available on the spatial distribution and trends of suspended sediment concentrations (SSC) in the sub-basins of UIB. This study covers the comparative assessment of flows and SSC trends measured at 13 stations in the UIB along with the variability of precipitation and temperatures possibly due to climate change for the past three decades. In the course of this period, the country’s largest reservoir, Tarbela, on the Indus River was depleted rapidly due to heavy sediment influx from the UIB. Sediment management of existing storage and future planned hydraulic structures (to tap 30,000 MW in the region) depends on the correct assessment of SSC, their variation patterns, and trends. In this study, the SSC trends are determined along with trends of discharges, precipitation, and temperatures using the non-parametric Mann–Kendall test and Sen’s slope estimator. The results reveal that the annual flows and SSC are in a balanced state for the Indus River at Besham Qila, whereas the SSC are significantly reduced ranging from 18.56%–28.20% per decade in the rivers of Gilgit at Alam Bridge, Indus at Kachura, and Brandu at Daggar. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000118842
Veröffentlicht am 05.05.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Wasser und Gewässerentwicklung (IWG)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2073-4441
KITopen-ID: 1000118842
Erschienen in Water
Verlag MDPI
Band 12
Heft 3
Seiten Article No. 730
Vorab online veröffentlicht am 06.03.2020
Schlagwörter suspended sediment concentrations; Upper Indus Basin; Mann–Kendall trend test; Sen’s slope estimator; Gilgit basin; Karakorum climate anomaly; Karakorum-Hindukush-Himalaya
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