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), pp. 279-295. (doi:10.1016/j.geomorph.2005.02.009).

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Description/Abstract

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.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.geomorph.2005.02.009
ISSNs: 0169-555X (print)
Related URLs:
Keywords: 100-year flood, hydraulic model, calibration, Manning’s n, flood frequency, power law, Thailand
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ePrint ID: 58061
Date :
Date Event
September 2005Published
Date Deposited: 18 Aug 2008
Last Modified: 16 Apr 2017 17:38
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/58061

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