Filters








11,984 Hits in 3.5 sec

Low-Level Detections of Halogenated Volatile Organic Compounds in Groundwater: Use in Vulnerability Assessments

L. Niel Plummer, Eurybiades Busenberg, Sandra M. Eberts, Laura M. Bexfield, Craig J. Brown, Lynne S. Fahlquist, Brian G. Katz, Matthew K. Landon
2008 Journal of hydrologic engineering  
109 groundwater samples from five study areas in the United States.  ...  In each case, the untreated water sample was used for drinking-water purposes or was from a monitoring well in an area near a drinking-water source.  ...  We thank the municipalities and water suppliers who participated in this study for their assistance in providing access to public-supply wells.  ... 
doi:10.1061/(asce)1084-0699(2008)13:11(1049) fatcat:4v5ykdb62vgaja2pnmdlal2okm

Assessment of regional change in nitrate concentrations in groundwater in the Central Valley, California, USA, 1950s–2000s

Karen R. Burow, Bryant C. Jurgens, Kenneth Belitz, Neil M. Dubrovsky
2012 Environmental Earth Sciences  
Very small increases in the shallow aquifer in the basin subregion may reflect downgradient movement of high nitrate groundwater from adjacent areas or overlying intensive agricultural inputs.  ...  Whereas the west fans subregion has elevated nitrate concentrations, temporal trends were not detected, likely due to the heterogeneous nature of the water quality in this area and geologic sources of  ...  Anning and the anonymous reviewers for their insightful and constructive comments in the preparation of the manuscript.  ... 
doi:10.1007/s12665-012-2082-4 fatcat:ox4n4vx6yjbotgcgkfnjmw7sjy

A review of high arsenic groundwater in Mainland and Taiwan, China: Distribution, characteristics and geochemical processes

Huaming Guo, Dongguang Wen, Zeyun Liu, Yongfeng Jia, Qi Guo
2014 Applied Geochemistry  
In the inland basins, mainly distributed in the northwest of China, shallow groundwaters usually have high As concentrations in alluvial lacustrine or lacustrine sediment aquifers, while high As groundwater  ...  These groundwaters usually occur in both arid-semiarid inland basins and river deltas.  ...  In the south of the basin which is the recharge area, shallow groundwater is generally of Mg-Na-HCO 3 -SO 4 type.  ... 
doi:10.1016/j.apgeochem.2013.12.016 fatcat:jsfapau5arhrhga76k3es4onmq

Water-column dark C02 fixation and bacterial-mat growth in intermittently anoxic Saanich Inlet, British Columbia

SK Juniper, R0 Brinkhurst
1986 Marine Ecology Progress Series  
Extensive Beggiatoa-like bactenal mats, exceeding 100 ha in area, were observed by submersible on sediments below 105 m.  ...  in the water column.  ...  We thank Master and crew of Pandora II and Chief Pdot and crew of h s c e s IV for support during diving operations in Saanich Inlet.  ... 
doi:10.3354/meps033041 fatcat:pocyyv4stbh67pu2v7rxlozgnm

Implementation 3D Inversion of Gravity Data to Identify Potential Hydrocarbon Reservoir Zones in West Timor Basin

Mohammad Syamsu Rosid, Cicilia Budi Saraswati
2020 Sains Malaysiana  
A gravity survey has been carried out in the area of West Timor, East Nusa Tenggara to identify the existence of basin structures.  ...  While in the southern part, especially in the central basin area, there is indicated a layer of sand sediment that is quite thick with a density value of about 2.2 gr/cm 3 and has the potential to become  ...  NKB-0640/UN2.R3.1/ HKP.05.00/2019 in publishing the result.  ... 
doi:10.17576/jsm-2020-4909-04 fatcat:d7u2otnrj5ag5mlawls2ua73pe

Geological spatial plan toward groundwater resources in Kertek, Wonosobo Basin, Central Java, Indonesia

Lutfian Rusdi Daryono, Hokkaido University, Japan, Melania Seta Dhesty Wijayaningsih, Agus Hendratno, Mochamad Nukman, Eddy Hartantyo, Satoru Kawasaki, Faculty of Mathematics and Sciences, Universitas Gadjah Mada, Yogyakarta, Indonesia, Department of Geological Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia, Sub-department of Geophysics, Faculty of Mathematics and Sciences, Universitas Gadjah Mada, Yogyakarta, Indonesia, Sub-department of Geophysics, Faculty of Mathematics and Sciences, Universitas Gadjah Mada, Yogyakarta, Indonesia, Laboratory of Biotechnology for Resource Engineering Div., of Sustainable Resources Engineering, Hokkaido University, Japan
2019 Journal of Degraded and Mining Lands Management  
Sand mines, as a pillar of building construction, have been over excavated in certain areas, which has impacted the environment.  ...  In this research, the purpose of this study was to determine a spatial allocation of the mining designation area that will not damage the groundwater flow.  ...  Lutvi Lenia from the Wonosono Government, the Geo-electrical team (Alvian Dwijayanta, Ichwan Adi Surya, and Yan Hendra Kurniawan), and other individuals that cannot be mentioned in this project.  ... 
doi:10.15243/jdmlm.2019.062.1595 fatcat:ldbynt3o2rbgtmer2akr62y57q

Constraints from magnetotellurics on the geological structure across a seismic area associated with water wells in the Paraná basin, Brazil

Ícaro José Assis Kume, Mauricio de Souza Bologna, Marcelo Assumpção
2019 Brazilian Journal of Geology  
We present the results from a magnetotelluric profile of about 4 km-long that crosses a seismic zone near the town of Bebedouro, in the Northeastern part of the intra-cratonic Paraná basin, in Brazil.  ...  The seismic activity is thought to be caused by a raise in pore-pressure within a fractured basalt aquifer due to the natural injection of water from the shallow aquifer into the basalt.  ...  In addition to this shallow unconfined aquifer, intense groundwater exploitation also occurs in confined fractured aquifers between basalt flows.  ... 
doi:10.1590/2317-4889201920190032 fatcat:qynp7wxmhnfntna6v4b7wdpw2y

MAPPING OF HIGH ELECTRICAL CONDUCTIVITY ON THE TORRES SYNCLINE HINGE, SOUTHEASTERN PARANÁ BASIN

ÍCARO VITORELLO, ANTONIO L. PADILHA
2000 Revista Brasileira de Geociências  
of past magmatic activities in the Early Cretaceous that affected the Paraná Basin and underlying lithosphere.  ...  A preliminary interpretation of the electrical structures beneath the SE Paraná Basin is presented based on electromagnetic geophysical soundings carried out around the Torres Syncline.  ...  are located, and expanded NW in order to detect the conductors' extension towards the center of the basin.  ... 
doi:10.25249/0375-7536.2000303535537 fatcat:uthn2sfd4jhwhgks4jsqes5xhq

Constraining P-wave velocity variations in the upper mantle beneath Southeast Asia

Chang Li, Robert D. van der Hilst, M. Nafi Toksöz
2006 Physics of the Earth and Planetary Interiors  
Our tomographic inversions reveal high-velocity roots beneath the Archean Ordos Plateau, the Sichuan Basin, and other continental blocks in SE Asia.  ...  We used 3D sensitivity kernels to combine the datasets, and mantle structure was parameterized with an irregular grid.  ...  This work was funded by NSF grant 6892042 of Collaborative Research in Eastern Tibet and AFRL grant FA8718-04-C-0018.  ... 
doi:10.1016/j.pepi.2005.09.008 fatcat:cmqvrywroveldlywiggotkw7l4

InSAR Campaign Reveals Ongoing Displacement Trends at High Impact Sites of Thessaloniki and Chalkidiki, Greece

Nikos Svigkas, Constantinos Loupasakis, Ioannis Papoutsis, Charalampos (Haris) Kontoes, Stavroula Alatza, Ploutarchos Tzampoglou, Cristiano Tolomei, Thomas Spachos
2020 Remote Sensing  
The sensitivity of the surface displacements to the water trends is highlighted in parts of the study area. Results highlight the plan of a water resources management as a high priority for the area.  ...  We studied the broader area of Thessaloniki in northern Greece and Chalkidiki and performed an InSAR campaign to study the surface deformation phenomena that have been known to exist for at least two decades  ...  Two aquifer systems can be identified at the study area: a shallow unconfined aquifer and a deep confined aquifer [49] .  ... 
doi:10.3390/rs12152396 fatcat:xec7pbuubbcxjkp7qg3eby27u4

Investigation of the Relationship between Groundwater Level Fluctuation and Vegetation Cover by using NDVI for Shaqlawa Basin, Kurdistan Region – Iraq

Shwan Seeyan, Broder Merkel, Rudy Abo
2014 Journal of geography and geology  
The NDVI values at different depth to groundwater intervals indicate that higher vegetation coverage and more plant diversity exist in areas of shallow groundwater.  ...  Distribution of vegetation was compared in the Shaqlawa Basin located in Kurdistan Region, Northern Iraq with the depth to groundwater by using the normalize difference vegetation index (NDVI) and the  ...  Table 4 . 4 NDMI area represents the moisture area in Shaqlawa basin. NDVI area represents the vegetation cover area.  ... 
doi:10.5539/jgg.v6n3p187 fatcat:rdug4euhx5dfjlx4mmc6qi5bwq

Basin and local scale detection of ground subsidence through persistent scatterer interferometry: The Anthemountas Basin (Northern Greece) case study

F. Raspini, C. Loupasakis, D. Rozos, S. Moretti
2016 Bulletin of the Geological Society of Greece  
In the framework of the Terrafirma Extension project, a study has been established for ground motion detection and mapping in the Anthemountas basin (Central Macedonia).  ...  The WAP results turned out to be a valuable tool for the characterization at local scale of the land subsidence in the runaways area of the Macedonia airport and in the village of Perea, affected in 2005  ...  Acknowledgments The Terrafirma Extension project has funded the SAR imagery processing as well as the geological interpretation presented in this paper.  ... 
doi:10.12681/bgsg.10989 fatcat:r32fv7bs7fb4bpax2zqh6nr5he

Sustainability of groundwater usage in northern China: dependence on palaeowaters and effects on water quality, quantity and ecosystem health

Matthew J. Currell, Dongmei Han, Zongyu Chen, Ian Cartwright
2012 Hydrological Processes  
Reservoir construction has reduced surface runoff in mountain-front areas that would naturally recharge regional Quaternary aquifers in many basins.  ...  In some basins, there is evidence that poor quality shallow water has leaked into deep layers (>200 m) via preferential flow, mixing with palaeowaters stored in semiconfined aquifers.  ...  Deep confined and semiconfined layers are probably recharged via horizontal flow in areas where these sediments grade into deep confined units away from the basin margins (e.g.  ... 
doi:10.1002/hyp.9208 fatcat:jkpfxkljunel7gea53j55rrama

Use of Alternative Hydrogeological Conceptual Models to Assess the Potential Impact of Climate Change on Groundwater Sustainable Yield in Central Huai Luang Basin, Northeast Thailand

Kewaree Pholkern, Phayom Saraphirom, Vincent Cloutier, Kriengsak Srisuk
2019 Water  
Sustainable management of groundwater resources is essential for sound groundwater development, especially in sensitive salt-affected areas.  ...  In Northeast Thailand, the Central Huai Luang Basin, underlain by rock salt, is the source of groundwater and soil salinity.  ...  Acknowledgments: The authors would like to thank Bureau 10 of the Regional Groundwater Resources in Udon Thani Province; the Department of Groundwater Resources (DGR); the Ministry of Natural Resources  ... 
doi:10.3390/w11020241 fatcat:eatbamudcbb6pcdqop6yxuitce

Hydrogeochemical Zonation of Deep Groundwaters Near Langshan Mountain of the Hetao Basin, Inner Mongolia

Yongfeng Jia, Huaming Guo
2013 Procedia Earth and Planetary Science  
This study observed that this deep groundwater is affected by the presence of As in a nearby mountainous area.  ...  Drinking water in the Hetao basin relies significantly on deep groundwater. Little is known about the occurrence of As and its distribution in deep groundwaters of the Hetao Basin.  ...  Acknowledgements The study has been financially supported by the National Natural Science Foundation of China (Nos. 41222020 and 41172224), the Program for New Century Excellent Talents in University (  ... 
doi:10.1016/j.proeps.2013.03.094 fatcat:fal43xrec5eyni2ugiriysgcpy
« Previous Showing results 1 — 15 out of 11,984 results