Thèses (M.Sc.)--Université de Sherbrooke (Canada), 1997. / Titre de l'écran-titre (visionné le 20 juin 2006). Publié aussi en version papier.

Thesis (M.S.)--University of Missouri-Columbia, 2004. / Typescript. Includes bibliographical references (leaves 91-92). Also available on the Internet.

Research project (M.B.A.)--Pepperdine University, 1977. / Original pages reproduced intact two per leaf. Includes bibliographical references (leaves 143-146).

Thesis (Doctoral)--Geneva. Université, 1943. / Includes bibliographical references.

Thesis (M.S.)--Brigham Young University. Dept. of Geology, 2005. / Includes bibliographical references (p. 26-28).

Tesis (licenciatura en economia)--Universidad Nacional Autónoma de México.

Thesis (M.S.)--University of Missouri-Columbia, 2004. / Typescript. Includes bibliographical references (leaves 91-92). Also available on the Internet.

Th. doct.--Rennes 1, 1997. / Bibliogr. p. 411-451. Résumé en français et anglais. MNHN = Muséum national d'histoire naturelle.

This study uses a fieldwork-modelling research methodology to investigate hydrological pathways and chemical transport in floodplains and riparian zones, which occupy a key position in the landscape at the catchment-river interface. A numerical model is developed (ESTEL2D-SUBIEF2D) that is capable of modelling subsurface water and chemical movement at a high spatial and temporal resolution. The model is used in conjunction with data from two field sites (a lowland floodplain on the River Severn, UK, and a headwater riparian zone on Sleepers River, USA), and with hypothetical tracers, to quantify the effect of a range of factors on the operation of hydrological and biogeochemical processes in floodplain systems. This study shows the relative importance of river and hillslope inputs of water and chemicals to the floodplain, and how the scale of hydrological event (overbank flow, bankfull flow and low flow) affects the interaction of these sources. For example, in the case of an overbank flood event, hillslope inputs can be held back by the steep hydraulic gradient induced by flood water for up to 10 days. A comparison of headwater and lowland floodplains is attempted for the first time and indicates that different hydrological processes operate in these two environments. This implies that results from existing smaller scale riparian zone studies cannot simply be 'scaled up' to larger, lowland floodplain zones. The operation of the denitrification process within the floodplain is investigated as a relevant example of the more general transport modelling capability of the numerical code. This supports and extends the results of previous studies which have suggested that denitrification in the floodplain may be fundamentally limited by the interaction of hydrological processes and carbon availability. This comprehensive exploration of the full range of subsurface flow pathways through the floodplain highlights the importance of an understanding of hydrological pathways as critical to understanding chemical transport within the floodplain system.

As part of the effort to satisfy the ever increasing demand for a greater understanding of fluvial, hydrological, chemical, sedimentological and geomorphological processes operating on the floodplain, mathematical simulation models have come to play a significant role in the understanding, prediction and management of the floodplain environment. Underlying the accurate numerical representation of hydraulically driven processes is the provision of a suitable floodplain hydrology model which accounts for the interaction between surface hydraulics and subsurface hydrology. Such a numerical representation is currently not available at the spatial and temporal resolution required. It is the aim of this thesis to develop a novel conceptual approach to modelling floodplain hydrology in which the fundamental need to consider the interaction between surface and subsurface flow is the floodplain environment is addressed. This is achieved through the interactive coupling of a one-dimensional finite difference infiltration model with the state-of-the-art two-dimensional physically based finite element hydraulic model, TELEMAC2D. The coupled model provides an unparalleled spatial and temporal representation of surface and subsurface flow processes within the floodplain environment. The utility of this integrated approach is explored through an application of the model to two areas of contemporary floodplain research. In the first of these the model is run to assess the impact of infiltration on flood flow prediction for an llkm reach of the River Culm, UK, over a range of flood and soil conditions. In the second the model is run to investigate the nitrate buffering potential of floodplain riparian soils during flooding. For this investigation a model accounting for nitrate transport and denitrification is developed within the existing integrated hydraulic-infiltration model structure. An evaluation of the results from both of these investigations supports the need for a new approach to modelling fluvially driven floodplain processes which accounts for the spatially interactive nature of floodplain hydrology.