Preprints
https://doi.org/10.5194/nhess-2016-16
https://doi.org/10.5194/nhess-2016-16
16 Feb 2016
 | 16 Feb 2016
Status: this discussion paper is a preprint. It has been under review for the journal Natural Hazards and Earth System Sciences (NHESS). The manuscript was not accepted for further review after discussion.

Modelling extreme discharge response to several geostatistically interpolated rainfall using very sparse raingage data

Sarann Ly, Catherine Sohier, Catherine Charles, and Aurore Degré

Abstract. This study presents modelling work of extreme discharge response to rainfall inputs interpolated by geostatistical approaches. Multivariate geostatistics are used by incorporating elevation as external data to improve the rainfall prediction. Thirty year daily rainfall in the Ourthe and Ambleve nested catchments, located in the Ardennes hilly landscape in the Walloon region, Belgium are interpolated and then used as inputs for a distributed physically-based hydrological model (EPIC-GRID). The effect of different raingage densities and particularly the effect of the raingage positions for very sparse raingage data used for rainfall interpolation, on extreme flow is analysed. We propose an index that can illustrate the quality of the raingage distribution with respect to the calculation of extreme discharge. In high elevation sub-catchment, we found that the multivariate geostatistics can significantly improve the rainfall prediction to produce very good simulated peak discharge. In the low elevation sub-catchment and the low raingage density, our results indicated that the Universal Kriging (UNK) is not appropriate. The IDW, Ordinary Kriging (ORK) and Ordinary Cokriging (OCK) methods provide generally good performance. The Thiessen polygon (THI) and Kriging with External Drift (KED) provide good performance for the whole catchment but less good for sub-catchments. The position of the raingages is the key factor for rainfall interpolation, particularly in the data-scarce region. UNK and KED methods are the most sensitive.

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Sarann Ly, Catherine Sohier, Catherine Charles, and Aurore Degré
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Sarann Ly, Catherine Sohier, Catherine Charles, and Aurore Degré
Sarann Ly, Catherine Sohier, Catherine Charles, and Aurore Degré

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Short summary
This study presents modelling work of extreme discharge response to rainfall inputs interpolated by various approaches. Elevation is used as external data to improve the rainfall prediction. Thirty years of daily rainfall in the Ourthe and Ambleve catchments (hilly landscape of Belgium) are used as inputs for a distributed hydrological model. We assess the effectiveness of extreme flow prediction using these methods. The position of the raingages is the key factor for rainfall interpolation.
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