Reconstructing the ca. 100-year flood in Northern Thailand
Kidson, R., Richards, K.S. and Carling, P.A. (2005) Reconstructing the ca. 100-year flood in Northern Thailand. Geomorphology, 70, (3-4), 279-295. (doi:10.1016/j.geomorph.2005.02.009).
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The key utilities of palaeohydrological studies are the potential to extend the flood record of a catchment and improve
estimates of flood frequency and magnitude. In this study, we use a hydraulic model to produce estimates of discharge based on
PSI (Palaeo-Stage Indicator) evidence from large floods for a study reach of the Mae Chaem River, Thailand. Careful
calibration of this model, especially Manning’s n, was possible because of the availability of PSIs from several modern gauged
flows. Organic PSI evidence, contained in a cave, permitted dating of the largest flood for which evidence was available, which
is close to the 100-year flood. The magnitude of this flood is twice that predicted from an extrapolation of the 49-year gauging
record employing the Gumbel EV1 flood frequency model, officially endorsed by water management agencies in Thailand. This
magnitude of flood is, however, very similar to that predicted from a Power Law model and suggests that extreme flood
magnitude and frequency in this catchment conform to Power Law behaviour. These results significantly increase the perception
of flood risk for the area, and this palaeohydrological case study represents the first for the region.
|Keywords:||100-year flood, hydraulic model, calibration, Manning’s n, flood frequency, power law, Thailand|
|Subjects:||G Geography. Anthropology. Recreation > G Geography (General)
G Geography. Anthropology. Recreation > GE Environmental Sciences
G Geography. Anthropology. Recreation > GB Physical geography
|Divisions:||University Structure - Pre August 2011 > School of Geography > Environmental Processes and Change
|Date Deposited:||18 Aug 2008|
|Last Modified:||02 Mar 2012 13:55|
|Contact Email Address:||P.A.Carling@soton.ac.uk|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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