Irda Institute Of Recherche Et Of Developpement En Agroenvironnement

Québec, Canada

Irda Institute Of Recherche Et Of Developpement En Agroenvironnement

Québec, Canada

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The flood plain micro-topography influences the extent of water bodies over submerged areas during floods. This analysis aims to compare interpolation methods for achieving high-precision digital elevation models (DEM) representing the micro-topography of flood plains. These methods were also compared using a geographic information system(GIS) to identify which are the most effective to represent the micro-topography of the sites, and that with a limited number of elevation data. The effectiveness of each interpolation method was validated through the root mean square error, statistical tests, "error maps" and a visual assessment in three dimensions. It appears that simple kriging, triangulated irregular network and ordinary kriging methods are the interpolation methods which most accurately represent the micro-topography of the sites, while the inverse distance and universal kriging interpolation methods produce greater errors. © 2010 IAHS Press.


Diane S.-L.,Irda Institute Of Recherche Et Of Developpement En Agroenvironnement | Diane S.-L.,University of Quebec at Trois - Rivieres | Lavoie L.,GDG Environnement | Ouellet C.,University of Quebec at Trois - Rivieres
Wetlands | Year: 2011

This study examines the spatial distribution of soil organic carbon (SOC) and other properties in soils in active floodplains using a high precision digital elevation model (DEM) and geographic information system. Floodplain microtopography may influence wetland hydrology and the physical and chemical properties of soil, thus affecting the balance of plant nutrients in this riverine environment. The selected sites were composed of three floodplains dominated by a forest consisting of silver maple (Acer saccharinum L.) with some green ash (Fraxinus pennsylvanica Marsh.). These floodplains were frequently subject to floods during spring (and also in summer and fall) that create dynamic processes in the formation of alluvial soils and in the structure and composition of floodplain vegetation. The maximum and minimum SOC rates that were obtained ranged from 0.05% to 3.16%, with median values of 0.87%. In addition, no preferential pattern was detected on SOC spatial distribution in floodplain soils even when a high precision digital elevation model was used to define floodplain microtopography. Frequent floods and vertical aggradation maintain the soil in an immature state and cause a depletion of the soil's organic carbon content. © Society of Wetland Scientists 2011.

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