subsurface mapping Articles

  • White paper on Willowstick technology used for mapping and modeling groundwater systems

    1.0 Introduction Willowstick Technology (the “Technology”) delineates and characterizes subsurface aqueous systems in complex hydrogeologic settings. It has consistently proven valuable in: 1) the diagnosis of seepage through earthen dams and levees; 2) characterizing groundwater infiltration into surface and subsurface mines; 3) tracking pollution plumes influenced by ...


    By Willowstick Technologies LLC

  • Case study: RMOTC - Using existing wells, hydro-geologic barriers are mapped.

    In August of 2005, Willowstick Technologies, LLC performed an AquaTrack study at the Teapot Dome oil field near Casper, Wyoming. The project was performed together with the assistance of the Rocky Mountain Oilfield Testing Center (RMOTC), a unit of the United States Department of Energy. The purpose of the project was to demonstrate how the AquaTrack technology can be applied to ...


    By Willowstick Technologies LLC

  • Use of geological mapping tools to improve the hydraulic performance of SuDS

    Most cities in Denmark are situated on low permeable clay rich deposits. These sediments are of glacial origin and range among the most heterogeneous, with hydraulic conductivities spanning several orders of magnitude. This heterogeneity has obvious consequences for the sizing of sustainable urban drainage systems (SuDS). We have tested methods to reveal geological heterogeneity at field scale ...


    By IWA Publishing

  • New Map Documents Natural Resource Rights in Sub-Saharan Africa

    Many countries in Africa are rich with trees, wildlife, minerals, and other natural resources. But as new WRI research and an interactive map show, few national laws provide communities with strong, secure rights to the resources on their land. WRI conducted a systematic review of the national framework laws for five natural ...

  • Magnetic and ground probing radar measurements for soil pollution mapping in the industrial area of Val Basento (Basilicata Region, Southern Italy): a case study

    Abstract  The joint application of electromagnetic techniques for near-surface exploration is a useful tool for soil pollution monitoring and can also contribute towards describing the spatial distribution of pollutants. The results of a geophysical field survey that was carried out for characterizing the heavy metal and waste disposal soil pollution phenomena in the industrial area of Val ...


  • Borehole Log Interpretation

    While employed with Conoco, Inc. analyzed and correlated well-log data in order to produce geologic structural maps of subsurface horizons in Louisiana and Oklahoma, for the purpose of oil and gas prospect generation. Analyzed and correlated well-log data in order to map the top of a highly permeable subsurface formation that was utilized as an injection zone for the disposal of brines generated ...


    By ECA Geophysics

  • Passive Seismic Tomography Project Phase I in Delvina, Albania Case Study

    Passive Seismic Tomography Project Phase I Project Area: approximately 900km2#11; Seismic Network: 50 stations Recording Period: 11 months Number of Seismic Events located/used: 2500/1860 The scope of this project was to provide coarse, but reliable 3D P-wave velocity and Vp/Vs models, adequate for a reconnaissance stage mapping of an area of ...


    By SeismoTech Ltd

  • Regional geological recognition for the implementation of a urban geothermal concept

    A reflection seismic survey was performed in the city of Lausanne (CH) to map geological layers relevant to geothermal energy production. By using a wireless seismic system and a powerful seismic vibrator source we were able to high quality results despite the presence of elevated urban noise levels. The new subsurface maps allow the estimation of the geothermal potential for the city of ...


    By Geo2X

  • A GIS-based methodology to delineate aquifer recharge areas

    A GIS-based methodology to delineate risk areas for contamination of groundwater resources is presented by identifying recharge conditions to the aquifer. Identifying the recharge areas is based upon surface and subsurface geologic conditions that may control the risk of potential oil spill contaminants into the aquifer. This study uses the Chicot aquifer system in southwest Louisiana as a pilot ...


    By Inderscience Publishers

  • Assessment of catchment response and calibration of a hydrological model using high-frequency discharge–nitrate concentration data

    This study uses a high-frequency discharge and nitrate concentration dataset from the Weida catchment in Germany for the catchment scale hydrologic response analysis. Nitrate transport in the catchment is mostly conservative as indicated by the nitrate stable isotope (δ15N and δ18O) analysis. Discharge–nitrate concentration data from the catchment show distinctive ...


    By IWA Publishing

  • Case Study - Pipeline Subsidence

    Looking for sinkholes Pyramid Environmental recently performed a geophysical investigation for the National Park Service at Carlsbad Caverns National Park in Carlsbad, NM. The survey used electrical resistivity mapping (ER) to look for potential underground caves or caverns near an area designated for the construction of an underground utility line. A 2D resistivity survey ...


    By Advanced Geosciences, Inc.

  • Passive Seismic Tomography Project Phase II in Assam, India - Case Study

    Passive Seismic Tomography Project Phase II Project Area: approximately 2000km2 Seismic Network: 76 stations Recording Period: 9 months Number of Seismic Events located/used: 276/263 The scope of this project, which followed a successful Phase I Passive Seismic Tomography survey in the same area, was to provide accurate and reliable 3D P-wave ...


    By SeismoTech Ltd

  • Case Study - Sinkhole: Leaking Retention Pond

    Scan for liner leaks in retention pond Objective:  Map the extent of a sink hole and locate zones where water is leaking from a pond Date:  January 20, 2015 Site: Retention pond and sink hole near Lenoir City, Tennessee, USA Instrument:  SuperStingR8 with 112 total electrodes arranged in a 4x28 3D grid with 16x8ft spacing ...


    By Advanced Geosciences, Inc.

  • Passive Seismic Tomography Project in Papua, Indonesia - Case Study

    Passive Seismic Tomography Project Project Area: approximately 1000km2#11; (4700km2 with the peripheral stations) Seismic Network: 80 stations Recording Period: 5 months The scope of this project was the successful completion of a full Passive Seismic Tomography survey in Asmat – Papua, Indonesia, for subsurface mapping purposes and detection ...


    By SeismoTech Ltd

  • Passive Seismic Tomography Project Phase II in Delvina, Albania - Case Study

    Passive Seismic Tomography Project Phase II Project Area: approximately 400km2 Seismic Network: 70 stations Recording Period: 11 months Number of Seismic Events located/used: 1200/1100 The scope of this project, which followed a successful Phase I Passive Seismic Tomography survey, was to provide accurate and reliable 3D P-wave velocity and ...


    By SeismoTech Ltd

  • Remote sensing and geographic information system for appraisal of salt-affected soils in India

    Received for publication January 23, 2009. Quantification of the nature, extent, and spatial distribution of salt-affected soils (SAS) for India and the world is essential for planning and implementing reclamation programs in a timely and cost-effective manner for sustained crop production. The national extent of SAS for India over the last four decades was assessed by conventional and remote ...

  • Bergen county golf courses drainage analysis & design for Rockleigh, Darlington, & Overpeck golf courses

    GEA provided Drainage Assessments and Designs for amelioration of flooding and poor drainage conditions for three (3) Golf Courses in Bergen County for the Bergen County Department of Parks. The three courses and their respective rivers or controlling streams included:· Darlington in Mahwah, NJ - Darlington Brook, tributary to Mahwah River; Overpeck in Teaneck, NJ -  Overpeck Creek; ...


    By GEA ENGINEERING

  • North Dakota Pipeline Release Data Collection and Communication - Case Study

    Challenge A North Dakota pipeline released an estimated 21,000 bbls of crude oil. Antea Group was challenged by the client to assemble a team of specialists capable of effectively and efficiently collecting and communicating extent and migration data to key stakeholders. Due to the magnitude of the spill, spatial and environmental data needed to be collected electronically to ...


    By Antea Group - USA

  • Principal Component Analyses of Groundwater Chemistry Data During Enhanced Bioremediation

    Abstract  A bioremediation project has been monitored for two years at a former sour gas plant site that had ethanolamine, glycol and their degradation products in the subsurface. The active enhanced bioremediation program consisted of dewatering and bioventing. An extensive groundwater monitoring program mapped the distribution of chemical species. Principal component analysis was used to ...


  • Roosevelt Dr. Stream embankment stabilization retaining wall and roadway Haverstraw, NY

    GEA Engineering provided comprehensive engineering services to the Rockland County Drainage Agency for emergency repairs to the river embankments of the Minisceongo Creek, Multi-Family Housing foundations and restoration of the municipal park. These services were required in response to Tropical Storm Floyd which caused extensive damage to Rockland County. GEA's services included:· Test ...


    By GEA ENGINEERING

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