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Spatial interpolation of daily rainfall in Ourthe and Ambleve Basins, Belgium
Ly, Sarann; Sohier, Catherine; Charles, Catherine et al.
2010In Geophysical Research Abstracts
Peer reviewed
 

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Keywords :
spatial interpolation; geostatistic; Kriging; IDW; Thiessen; daily rainfall
Abstract :
[en] Spatial interpolation of precipitation data is of great importance for hydrological modelling. The methods of geostatistics (krigings) become more popular to make spatial interpolation from point measurement to distributed hydrological models. However, most of existing geostatistic algorithms are available only for single-moment data. The first step of Kriging computation is the semi-variogramme modelling which usually uses only one variogramme model for all-day data. The objective of this paper is to review the implementation of an algorithm of spatial interpolation methods for daily rainfall and to compare the results of geostatistic and deterministic approaches. In this study, we will use daily rainfall data from 70 rain gauges in the hilly landscape of Ourthe and Ambleve Basins in Belgium (2751 km2). This area lies between 35 and 690 m in elevation and consists of river networks which are the tributaries of the Meuse River. The proposed algorithm will use the method of Cressie’s Approximate Weighted Least Squares to fit among sevens semi-variogramme models (logarithmic, power, exponential, Gaussian, rational quadratic, spherical and penta-spherical) to daily sample semi-variogrammes. These seven models are computed on a daily basis. Firstly, one model is chosen by considering the minimum of least squares coefficient. Secondly, if the chosen model gives negative interpolated values, other models will be chosen again until the result become positive. Cross validation will be used to compare the interpolation performance of geostatistic to deterministic methods usually known as Thiessen polygon and Inverse DistanceWeighting (IDW).
Disciplines :
Earth sciences & physical geography
Environmental sciences & ecology
Author, co-author :
Ly, Sarann ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech > Hydrologie et Hydraulique agricole > Doctorat
Sohier, Catherine ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Charles, Catherine ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Degre, Aurore  ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Language :
English
Title :
Spatial interpolation of daily rainfall in Ourthe and Ambleve Basins, Belgium
Publication date :
May 2010
Event name :
European Union of Geosciences General Assembly
Event organizer :
European Union of Geosciences
Event place :
Vienne, Austria
Event date :
2-7 mai 2010
Audience :
International
Main work title :
Geophysical Research Abstracts
Collection name :
Vol. 12, EGU2010-3164, 2010
Peer reviewed :
Peer reviewed
Funders :
CUD - Commission Universitaire pour le Développement [BE]
Available on ORBi :
since 02 April 2010

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