For calculating flood hazard, 2-D models are more and more used replacing 1-D models because they permit to obtain a detailed view of the flooding patterns. However, a 2-D calculation on large areas remains time consuming. Thus, one alternative consists in coupling 1-D and 2-D models. Often, the 1-D model is dedicated to the areas such as the river...
Le chapitre commence par une description des phénomènes physiques propres aux inondations, en particulier, ceux qui les distinguent des écoulements ordinaires en rivière. Ces différents phénomènes sont rattachés aux différents types d'inondations qui ont été énumérés auparavant. Pour modéliser ces phénomènes en vue de la gestion des inondations, il...
Small reservoirs represent a critical water supply to millions of farmers across semi-arid regions, but their hydrological modelling suffers from data scarcity and highly variable and localised rainfall intensities. Increased availability of satellite imagery provide substantial opportunities but the monitoring of surface water resources is constra...
The chapter starts by describing the physical processes typical of floods, particularly, the ones that cannot be observed at low river flows. All these latter processes are linked to the various kinds of floods described above. In order to simulate these processes for flood management, a relevant spatial scale should be selected. For each kind of f...
Les bassins-versants de la Flume et de l'Ille-et-Illet, du département d'Ille-et-Vilaine, sont fortement exposés aux menaces liées à l'eau, entre l'excès d'eau lors des inondations et le manque d'eau durant les périodes d'étiages sévères. Ces phénomènes sont probablement les conséquences d'à-coups hydrauliques récurrents, qui proviennent du ruissel...
On the 3rd October 2015, heavy localized precipitations have occurred in South Eastern France leading to major flash floods on the Mediterranean coast. The severity of those floods has caused 20 fatalities and important damage in almost 50 municipalities in the French administrative area of Alpes-Maritimes. The local recording rain gauges have show...
Ce chapitre a pour ambition de proposer une approche méthodologique pour la prise en compte des incertitudes comme étant une composante capitale de l’évaluation de la durabilité des décisions de gestion des risques d’origine naturelle. Il décrit les deux étapes proposées dans cette optique. La première étape porte sur l’évaluation de la durabilité ...
This work examines 140 hydrological studies conducted in the Mediterranean region. It identifies key characteristics of the hydrological responses of Mediterranean catchments at various time scales and compares different methods and modelling approaches used for individual-catchment studies. The study area is divided into the northwestern (NWM), ea...
Heavy precipitation events (HPE) and flash floods (FF) are common phenomena over the Mediterranean region. The peculiar topography and geographical location of this area make it especially favorable to the occurrence of intense events. The Mediterranean Sea acts as a vast heat andmoisture reservoir from which baroclinic atmospheric systems pump par...
Measurements of river and lake water levels from space-borne radar altimeters (past missions include ERS, Envisat, Jason, Topex) are useful for calibration and validation of large-scale hydrological models in poorly gauged river basins. Altimetry data availability over the downstream reaches of the Brahmaputra is excellent (17 high-quality virtual ...
