scholarly journals Common and different features of Chinese and Italian hydrogeological mapping guidelines

2018 ◽  
Vol 71 (2) ◽  
pp. 105-111
Author(s):  
Aimin Wu ◽  
Lucio Martarelli ◽  
Rong Ma ◽  
Huang Wang ◽  
Huifeng Yang ◽  
...  
Keyword(s):  
Hydrogeological Mapping

scholarly journals The Applicability of an Inverse Schlumberger Array for Near-Surface Targets in Shallow Water Environments

2020 ◽  
Vol 12 (13) ◽  
pp. 2132
Author(s):  
Annika Fediuk ◽  
Dennis Wilken ◽  
Martin Thorwart ◽  
Tina Wunderlich ◽  
Ercan Erkul ◽  
...  
Keyword(s):  
Field Measurements ◽  
Rock Masses ◽  
Time Saving ◽  
Resistivity Tomography ◽  
Near Surface ◽  
Archaeological Prospection ◽  
Hydrogeological Mapping ◽  
Sandy Aquifers ◽  
Sandy Sediments ◽  
Low Porosity

We investigate the applicability of offshore geoelectrical profiling in the littoral zone, e.g., for archaeological prospection, sediment classification and investigations on coastal ground water upwelling. We performed field measurements with a 20 m long multi-electrode streamer in inverse Schlumberger configuration, which we used to statistically evaluate measurement uncertainty and the reproducibility of offshore electric resistivity tomography. We compared floating and submerged electrodes, as well as stationary and towed measurements. We found out that apparent resistivity values can be determined with an accuracy of 1% to 5% (1σ) depending on the measurement setup under field conditions. Based on these values and focusing on typical meter-scale targets, we used synthetic resistivity models to theoretically investigate the tomographic resolution and depth penetration achievable near-beach underneath a column of brackish water of about 1 m depth. From the analysis, we conclude that offshore geoelectric sounding allows the mapping of archaeological stone settings. The material differentiation of low-porosity rock masses < 15% is critical. Submerged wooden objects show a significant resistivity contrast to sand and rocks. Distinguishing brine-saturated sandy sediments from cohesive silty-clayey sediments is difficult due to their equal or reversed resistivity contrasts. Submarine freshwater discharges in sandy aquifers can be localized well, though difficulties may occur if the seafloor encounters massive low-porosity rock masses. As to the measurement setups, submerged and floating electrodes differ in their spatial resolution. Whereas stone settings of 0.5 to 1 m can still be located with submerged electrodes within the uppermost 4 m underneath the seafloor, they have to be >2 m if floating electrodes are used. Therefore, we recommend using submerged electrodes, especially in archaeological prospection. Littoral geological and hydrogeological mapping is also feasible with floating electrodes in a more time-saving way.

scholarly journals Numerical model of the catchments of the oziąbel and wołczyński strumień rivers – Wołczyn municipality

2012 ◽  
Vol 34 (2) ◽  
pp. 73-89
Author(s):  
Tomasz Olichwer ◽  
Marek Wcisło ◽  
Stanisław Staśko ◽  
Sebastian Buczyński ◽  
Magdalena Modelska ◽  
...  
Keyword(s):  
Numerical Model ◽  
Water Balance ◽  
Water Table ◽  
Cross Sections ◽  
Visual Modflow ◽  
Step Size ◽  
Hydrogeological Mapping ◽  
One Year ◽  
Discretization Grid ◽  
Hydrogeological System

Abstract The article presents a numerical model designed for determining groundwater dynamics and water balance of the catchments of the Oziąbel (Czarna Woda) river and the Wołczyński Strumień river in Wołczyn region. Hydrogeological mapping and modelling research covered the area of 238.9 km2. As a result of measurements performed in 2008-2009, flows were determined in major rivers and water table positions were measured at 26 points. In the major part of the area described, the water table, lying at the depth of 1.5-18.7 m, has unconfined character, and the aquifer is built of Neogene (Quaternary) sands and gravels. In the area under study, groundwaters are drawn from 6 wells with total withdrawal of 6133 m3/d. The numerical modelling was performed with the use of Visual Modflow 3.1.0 software. The area was partitioned by a discretization grid with a step size l = 250 m. The conceptual model of the hydrogeological system is based on hydrological data gathered over a period of one year, data from HYDRO bank database, cross-sections and maps. The boundaries of the modelled hydrogeological system were established on the watersheds of the Wołczyński Strumień river and the Oziąbel river, apart from the areas where they run together. The modelled area was extended (271.5 km2) around the Wołczyński Strumień river catchment to achieve a more effective mapping of the anthropogenic impact on its balance and the hydrodynamic system of the catchment area. The structure is characterised by the occurrence of one or rarely two aquifers separated by a pack of Quaternary clays. The investigation produced a detailed water balance and its components.

scholarly journals Unstable rock slope hydrogeology: insights from the large-scale study of western Argentera-Mercantour hillslopes (South-East France)

2007 ◽  
Vol 178 (2) ◽  
pp. 159-168 ◽  
Author(s):  
Stéphane Binet ◽  
Yves Guglielmi ◽  
Catherine Bertrandet ◽  
Jacques Mudry
Keyword(s):  
Flow Velocity ◽  
Large Scale ◽  
Rock Slope ◽  
Fractured Rock ◽  
Gravitational Instabilities ◽  
Large Landslide ◽  
Hydrogeological Mapping ◽  
Lower Variation ◽  
Natural Spring

Abstract Inventory of unstable hillslopes, hydrogeological mapping and hydrochemical characteristics of natural spring waters were used to determine the long-term relationships between groundwater and gravitational instabilities in the Upper Tinée Valley (South-East French Alps). Water chemistry and flow records allow to propose a conceptual model of water flow within unstable rocky slopes and to back-calculate the volume of infiltrated water and the flow velocity in the aquifers for different deformation states of the slopes. An increase in infiltrated yield, flow velocity and porosity is observed and linked to collapsed and toppled structures in the upper parts of the hillslopes. In these areas, perched aquifers take place in the reworked media. When a large landslide occurs, it modifies the geometry of the slope and bypasses the perched flows down to the foot of the slope. With long-term continuous slope deformation, the associated effect between water flows and slope destabilization changes. In the fractured rock, the coupled effect corresponds to rising water pressures with limited volumes of infiltrated water; in the more fractured and permeable collapsed and toppled areas, the volumes of infiltrated water increase with a lower variation of water pressures.

scholarly journals Geophysical methods and data administration in Danish groundwater mapping

1969 ◽  
Vol 17 ◽  
pp. 41-44 ◽  
Author(s):  
Ingelise Møller ◽  
Verner H. Søndergaard ◽  
Flemming Jørgensen
Keyword(s):  
Urban Development ◽  
Large Scale ◽  
Groundwater Resources ◽  
Geophysical Methods ◽  
Significant Part ◽  
Total Cost ◽  
Water Abstraction ◽  
Hydrogeological Mapping ◽  
Groundwater Mapping ◽  
Geophysical Mapping

Groundwater mapping in Denmark has high priority. It was initiated in the 1990s when the pressure on groundwater resources increased due to urban development and pollution from industrial and agricultural sources. In some areas, the groundwater mapping included survey drillings, modelling based on existing knowledge and geophysical mapping with newly developed methods that made area coverage on a large scale possible. The groundwater mapping that included development of new geophysical methods showed promising results, and led to an ambitious plan to significantly intensify the hydrogeological mapping in order to improve the protection of the Danish groundwater resources. In 1999 the Danish Government initiated the National Groundwater Mapping Programme with the objective to obtain a detailed description of the aquifers with respect to localisation, extension, distribution and interconnection as well as their vulnerability to pollution (Thomsen et al. 2004). This mapping programme covers around 40% of the area of Den - mark designated as particularly valuable water abstraction areas. Water consumers fi nance the mapping programme by paying 0.04 € per cubic metre of consumed water. At the end of the programme in 2015, the total cost is estimated to be about 250 000 000 € with a significant part spent on geophysical mapping.

Major River and Lake Basins of the World

2017 ◽  
Author(s):  
Tales Carvalho-Resende
Keyword(s):  
Surface Water ◽  
World Wide ◽  
Assessment Programme ◽  
The World ◽  
Hydrogeological Mapping ◽  
Major River ◽  
Lake Basins

The dataset comprises the GIS layer of 405 major river and lake basins of the world. Data was collected within the framework of the BGR-UNESCO "World-wide Hydrogeological Mapping and Assessment Programme" (WHYMAP): www.whymap.org Basin Surface water Transboundary

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