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dc.contributor.authorThapa, S
dc.contributor.authorSinclair, HD
dc.contributor.authorCreed, MJ
dc.contributor.authorMudd, SM
dc.contributor.authorAttal, M
dc.contributor.authorBorthwick, AGL
dc.contributor.authorGhimire, BN
dc.contributor.authorWatson, CS
dc.date.accessioned2023-11-20T16:21:17Z
dc.date.available2023-11-20T16:21:17Z
dc.date.issued2023-11-01
dc.identifier.issn1096-9837
dc.identifier.issn1096-9837
dc.identifier.urihttps://pearl.plymouth.ac.uk/handle/10026.1/21671
dc.description.abstract

<jats:title>Abstract</jats:title><jats:p>This paper investigates how variations in sediment supply, grain size distribution and climate change affect channel morphology and flood inundation in the Nakkhu River, Kathmandu, Nepal. Climate change‐induced extreme rainfall is expected to increase flood intensity and frequency, causing severe flooding in the Kathmandu basin. The upper reaches of the Nakkhu River are susceptible to landslides and have been impacted by large‐scale sand mining. We simulate potential erosion and deposition scenarios along a 14 km reach of the Nakkhu River using the landscape evolution model CAESAR‐Lisflood with a 10 m digital elevation model, field‐derived sediment grain size data, daily discharge records and flood forecast models. In a series of numerical experiments, we compare riverbed profiles, cross‐sections, flood extent and flow depths for three scenarios (1.2‐, 85‐ and 1000‐year return period floods). For each scenario, the model is first run without sediment transport and then with sediment transport for three grain size distributions (GSDs) (observed average, finer and coarser). In all cases, the inclusion of sediment led to predicted floods of a larger extent than estimated without sediment. The sediment grain size distribution was found to have a significant influence on predicted river morphology and flood inundation, especially for lower magnitude, higher probability flood events. The results emphasise the importance of including sediment transport in hydrological models when predicting flood inundation in sediment‐rich rivers such as those in and around the Himalaya.</jats:p>

dc.format.extent706-727
dc.languageen
dc.publisherWiley
dc.subjectclimate change
dc.subjectflood modelling
dc.subjectgrain size distribution
dc.subjectNepal
dc.subjectriver morphology
dc.subjectsediment transport
dc.titleThe impact of sediment flux and calibre on flood risk in the Kathmandu Valley, Nepal
dc.typejournal-article
dc.typeArticle
plymouth.issue2
plymouth.volume49
plymouth.publisher-urlhttp://dx.doi.org/10.1002/esp.5731
plymouth.publication-statusPublished
plymouth.journalEarth Surface Processes and Landforms
dc.identifier.doi10.1002/esp.5731
plymouth.organisational-group|Plymouth
plymouth.organisational-group|Plymouth|Faculty of Science and Engineering
plymouth.organisational-group|Plymouth|Faculty of Science and Engineering|School of Engineering, Computing and Mathematics
plymouth.organisational-group|Plymouth|Users by role
plymouth.organisational-group|Plymouth|Users by role|Academics
dcterms.dateAccepted2023-10-03
dc.date.updated2023-11-20T16:21:11Z
dc.rights.embargodate2023-11-22
dc.identifier.eissn1096-9837
rioxxterms.versionofrecord10.1002/esp.5731


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