Frétigney-et-Velloreille – Grotte de La Baume Noire, Bois de Montbournot

La grotte de La Baume Noire est située dans le bois communal dit Bois de Montbournot. Il s’agit d’une grotte-aven remarquable avec un porche large de 20 m pour une hauteur de 5 m environ (fig. 1). La grotte qui s’ouvre sur le liane d’une colline, se compose de deux vastes salles creusées dans les calcaires compacts du Bathonien. Une très forte déclivité constitue la caractéristique principale de la partie externe de la cavité ainsi que de la première salle : 20,80 m séparent en effet la parti..

Evaluation of Regional-Scale River Depth Simulations Using Various Routing Schemes within a Hydrometeorological Modeling Framework for the Preparation of the SWOT Mission

The Surface Water and Ocean Topography (SWOT) mission will provide free water surface elevations, slopes, and river widths for rivers wider than 50 m. Models must be prepared to use this new finescale information by explicitly simulating the link between runoff and the river channel hydraulics. This study assesses one regional hydrometeorological model’s ability to simulate river depths. The Garonne catchment in southwestern France (56 000 km2) has been chosen for the availability of operational gauges in the river network and finescale hydraulic models over two reaches of the river. Several routing schemes, ranging from the simple Muskingum method to time-variable parameter kinematic and diffusive waves schemes, are tested. The results show that the variable flow velocity schemes are advantageous for discharge computations when compared to the original Muskingum routing method. Additionally, comparisons between river depth computations and in situ observations in the downstream Garonne River led to root-mean-square errors of 50–60 cm in the improved Muskingum method and 40–50 cm in the kinematic–diffusive wave method. The results also highlight SWOT’s potential to improve the characterization of hydrological processes for subbasins larger than 10 000 km2, the importance of an accurate digital elevation model, and the need for spatially varying hydraulic parameters

Evaluation of regional-scale water level simulations using various river routing schemes within a hydrometeorological modelling framework for the preparation of the SWOT mission

The ability of a regional hydrometeorological model to simulate water depth is assessed in order to prepare for the SWOT (Surface Water and Ocean Topography) mission that will observe free surface water elevations for rivers having a width larger than 50/100 m. The Garonne river (56 000 km2, in south-western France) has been selected owing to the availability of operational gauges, and the fact that different modeling platforms, the hydrometeorological model SAFRAN-ISBA-MODCOU and several fine scale hydraulic models, have been extensively evaluated over two reaches of the river. Several routing schemes, ranging from the simple Muskingum method to time-variable parameter kinematic and diffusive waves schemes with time varying parameters, are tested using predetermined hydraulic parameters. The results show that the variable flow velocity scheme is advantageous for discharge computations when compared to the original Muskingum routing method. Additionally, comparisons between water level computations and in situ observations led to root mean square errors of 50-60 cm for the improved Muskingum method and 40-50 cm for the kinematic-diffusive wave method, in the downstream Garonne river. The error is larger than the anticipated SWOT resolution, showing the potential of the mission to improve knowledge of the continental water cycle. Discharge computations are also shown to be comparable to those obtained with high-resolution hydraulic models over two reaches. However, due to the high variability of river parameters (e.g. slope and river width), a robust averaging method is needed to compare the hydraulic model outputs and the regional model. Sensitivity tests are finally performed in order to have a better understanding of the mechanisms which control the key hydrological processes. The results give valuable information about the linearity, Gaussianity and symetry of the model, in order to prepare the assimilation of river heights in the model

Alsace

Thévenin A. Alsace. In: Gallia préhistoire, tome 17, fascicule 2, 1974. pp. 541-560

Alsace

Thévenin A. Alsace. In: Gallia préhistoire, tome 19, fascicule 2, 1976. pp. 479-502

Alsace

Thévenin A. Alsace. In: Gallia préhistoire, tome 13, fascicule 2, 1970. pp. 393-410

Lorraine

Thévenin A. Lorraine. In: Gallia préhistoire, tome 18, fascicule 2, 1975. pp. 563-581

G. Cordier, Inventaire des mégalithes de la France, I. Indre-et-Loire.

Thévenin André. G. Cordier, Inventaire des mégalithes de la France, I. Indre-et-Loire.. In: Revue archéologique du Centre de la France, tome 26, fascicule 1, 1987. pp. 107-108

Alsace

Thévenin A. Alsace. In: Gallia préhistoire, tome 15, fascicule 2, 1972. pp. 413-426

Alsace

Thévenin A. Alsace. In: Gallia préhistoire, tome 21, fascicule 2, 1978. pp. 547-572