Oscillatory well pumping was proposed recently as a tool for hydraulic tomography. Periodic pumping at a few frequencies is carried out through vertical intervals along the pumping well and the periodic head is measured along a few piezometers. The paper presents an analytical solution for the head field in an unconfined aquifer of finite depth under the common assumptions of a linearized water...

The analysis of geochemical markers is a known valid tool to explore the water sources and understand main factors affecting natural quality, which are issues interest in environmental science. This study reports application characterize recharge areas multi-layer urban aquifer Como city (northern Italy). area presents perfect case test markers: hydrogeological setting affected by layered karst...

This paper discusses the design and practical use of efficient trajectories for an autonomous underwater vehicle. The vehicle model that will be presented is based on the NASA funded Deep Phreatic Thermal Explorer (DEPTHX) and the Omni-Directional Intelligent Navigator (ODIN). The underlying mathematical framework is developed using geometric control theory and differential geometry. Briefly, t...

Volcanic lakes within calderas should be viewed as high-risk systems, and an intensive lake monitoring must be carried out to evaluate the hazard of potential limnic or phreatic-magmatic eruptions. In Ecuador, two caldera lakes – Lakes Quilotoa and Cuicocha, located in the high Andean region >3000 a.s.l. – have been the focus of these investigations. Both volcanoes are geologically young or his...

The Ochtiná Aragonite Cave (Western Carpathians) represents an unique natural phenomenon. It originated under particular lithological and hydrogeological conditions of the Karst in which several isolated lenses Paleozoic crystalline limestone (marbles), partly metasomatically altered to ankerite, are enclosed by phyllites. Meteoric water seepage through non-carbonate rocks dissolved caused oxid...

This work systematically quantifies groundwater’s effect on the roof stability of underground openings in shallow coal mines and indirectly assesses potential for sinkhole formation. A specific stratigraphy was analyzed where opening instability can lead to formation, given geological conditions, overburden stratigraphy, depth openings. The groundwater recharge investigated as an individual rai...

Groundwater contributes to the delivery of phreatic water crop aeration zones via evapotranspiration, which is important for growth in drought-prone regions. Most studies on groundwater contribution have not considered influence stage or daily evapotranspiration. In this study, a neural network based genetic algorithm and Levenberg–Marquardt backpropagation algorithm, as well formula methods an...