Characteristics of deep groundwater flow in a basin marginal setting at Sellafield, Northwest England: 36Cl and halide evidence

2007 ◽  
Vol 22 (1) ◽  
pp. 128-151 ◽  
Author(s):  
Richard Metcalfe ◽  
Mark B. Crawford ◽  
Adrian H. Bath ◽  
Anna K. Littleboy ◽  
Paul J. Degnan ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Deep Groundwater

scholarly journals Hydrogeological Classification and the Correlation of Groundwater Chemistry with Basin Flow in the South-Western Part of Bangladesh

2018 ◽  
Vol 42 (1) ◽  
pp. 41-54 ◽  
Author(s):  
Shahpara Sheikh Dola ◽  
Khairul Bahsar ◽  
Mazeda Islam ◽  
Md Mizanur Rahman Sarker
Keyword(s):  
Groundwater Flow ◽  
Water Chemistry ◽  
Sea Water ◽  
Shallow Groundwater ◽  
Shallow Aquifer ◽  
Deep Basin ◽  
Deep Groundwater ◽  
Deep Aquifer ◽  
Delta Plain ◽  
Type Water

Attempt has been made to find the relationship between the basin groundwater flow and the current water chemistry of south-western part of Bangladesh considering their lithological distribution and aquifer condition. The correlation of water chemistry and basin groundwater flow is depicted in the conceptual model. The water-types of shallow groundwater are predominantly Mg-Na-HCO3 and Ca- Mg-Na-HCO3 type. In the deep aquifer of upper delta plain is predominately Na-Cl, Ca-HCO3 and Mg- HCO3 type. In the lower delta plain Na-Cl type of water mainly occurs in the shallow aquifer and occasionally Ca-HCO3, Ca-Mg-Na-HCO3 and Mg-HCO3 type may also occur in shallow aquifer of the eastern part of lower delta plain which could have originated from the recent recharge of rain water. Na- Cl type water is also found in the deep aquifer of lower delta plain. The origin of Na-Cl type water in the deep aquifer of lower delta part might be connate water or present day sea water intrusion. Fresh water occurring in the deep aquifer in the lower delta area is mostly of Mg-Ca-HCO3 and Na-HClO3 types. This type of water originate from intermediate or deep basin flow from the northern part of Bangladesh. The probable source of deep groundwater is Holocene marine transgression (Khan et al. 2000) occurred in 3000–7000 cal years BP and the deep groundwater of Upper Delta plain and Lower Delta plain is clearly influenced by deep basin flow coming from north part of BangladeshJournal of Bangladesh Academy of Sciences, Vol. 42, No. 1, 41-54, 2018

scholarly journals Deep groundwater flow as the main pathway for chemical outputs in a small headwater watershed (Mule Hole, South India)

2011 ◽  
Vol 26 ◽  
pp. S94-S96 ◽  
Author(s):  
J.C. Maréchal ◽  
J. Riotte ◽  
C. Lagane ◽  
S. Subramanian ◽  
C. Kumar ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
South India ◽  
Deep Groundwater ◽  
Main Pathway

scholarly journals Anthropogenic disturbances of natural ecohydrological processes in the Matlabas mountain mire, South Africa

2019 ◽  
Vol 115 (5/6) ◽  
Author(s):  
Antoinette Bootsma ◽  
Samer Elshehawi ◽  
Ab Grootjans ◽  
Piet-Louis Grundling ◽  
Steven Khosa ◽  
...  
Keyword(s):  
South Africa ◽  
Groundwater Flow ◽  
Southern Africa ◽  
Wetland Management ◽  
Terrestrial Vegetation ◽  
Deep Groundwater ◽  
Near Surface ◽  
Water Flows ◽  
Access Road ◽  
Isotope Content

Matlabas is a mountain mire in Marakele National Park, located within the headwaters of the Limpopo River in South Africa. This mire consists of a complex of valley-bottom and seepage wetlands with small elevated peat domes. The occurrence of one decaying peat dome, which has burnt, and desiccated wetland areas with terrestrial vegetation has raised concerns. The aim of this study was to understand the mire features and water flows in order to identify the potential drivers causing wetland degradation. Wells and piezometers were installed to monitor the hydraulic head and collect water samples for analysis of ion composition, 18O and 2H stable isotope content, and δ13C and 14C isotope content for radiocarbon dating. Moreover, peat temperature profiles were measured and peat deposits were also dated using radiocarbon. Results indicate that the Matlabas mire developed in the lowest central-east side of the valley by paludification at the onset of the Holocene. During the Mid-Holocene, peat development was extended laterally by autogenic and allogenic processes. Three types of water flows driving peat development were identified – sheet flow, phreatic groundwater flow and deep groundwater flow – two of which are surface or near surface flows. The recent occurrence of decaying peat domes and desiccated wetland areas is possibly related to loss of exfiltrating deep groundwater flows that have resulted from drainage by the head-cut channels in the mire and interception of near surface water flow by an access road, respectively. Interventions should be undertaken to prevent further degradation of the mire. Significance: This study is the first, as far as we are aware, on the ecohydrology of an inland mountainous mire in southern Africa. The results highlight the importance of the current wetland management (including rehabilitation) initiatives in South Africa. The integrative ecohydrological methods can be applied in other headwater wetlands in southern Africa.

Geochemical Approaches to Understanding a Shallow Groundwater Flow in the Kanamaru Uranium Mineralization Area (Japan)

2005 ◽  
Vol 893 ◽  
Author(s):  
Regis Bros ◽  
Yoji Seki ◽  
Atsushi Kamei ◽  
Yutaka Kanai ◽  
Koichi Okuzawa ◽  
...  
Keyword(s):  
Groundwater Flow ◽  
Flow System ◽  
Shallow Groundwater ◽  
Shallow Waters ◽  
Vertical Diffusion ◽  
Deep Groundwater ◽  
Fresh Groundwater ◽  
Activity Ratios ◽  
Alkaline Earths ◽  
Groundwater Systems

AbstractPredicting the behaviour of radioactive wastes can be facilitated by comparison with the evolution of natural groundwater systems. During a study of the Kanamaru U mineralization (Japan), geochemical approaches for understanding a shallow (0-50 m) fresh groundwater flow system are being assessed. Deep granitic waters are Ca-HCO3-dominated and slightly acidic to slightly alkaline. Shallow waters within sediments display lower pH and they are more dilute. Halide concentrations suggest the existence of a non marine Br-rich and Cl-depleted deep groundwater in the basement. 234U/238U and 230Th/234U activity ratios in the mineralized sedimentary rocks indicate that U mobilization took place within the last 350,000 years. U dissolution currently continues and it is controled by lateral groundwater flow whereas vertical diffusion appears negligible. Dissolved alkaline earths concentrations and the 87Sr/86Sr ratio indicate that solutes exchanges take place through uppermost low permeable granite followed by mixing with more dilute and Cl-type shallow groundwater.

scholarly journals Multi-Technique groundwater flow system analysis and dating of deep aquifers in Alessandria Basin (Piedmont - IT)

2020 ◽  
Author(s):  
Nicola Quaranta ◽  
Elena Cogo ◽  
Adriano Simoni ◽  
Elisa Sacchi ◽  
Mariachiara Caschetto ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
Groundwater Flow ◽  
System Analysis ◽  
Dissolved Inorganic Carbon ◽  
Flow System ◽  
Isotope Composition ◽  
Radioactive Isotopes ◽  
Deep Groundwater ◽  
Groundwater Flow System ◽  
Deep Aquifers

The aim of the study was to set up a protection system from pollution of the deep aquifer of the Alessandria basin, by redefining the recharge areas, focused on this portion of Piedmont territory, and therefore by creating some reserve areas of deep groundwater, to be preserved for future human drinking purposes. In addition to the classical hydrodynamic and geochemical monitoring techniques, the groundwaters were analyzed with reference to a monitoring network of 25 selected wells with deep screens (80-300 m below ground surface) combining radiochemical dating (14C and δ13C of dissolved inorganic carbon - DIC) with anthropogenic tracers (CFCs, SF6) as indicators of recent recharge/ mixing. Stable isotope composition (δ2H and δ18O – H2O) was assessed during a 1-year sampling of snow-rain precipitations gauges distributed in altitude in order to define Local Meteoric Water Lines; the isotopic composition was also seasonally measured for the main rivers and in selected deep-wells. The 3D numerical model was implemented in FEflow platform and calibrated on the basis of the available monitoring data; it was used as a support tool in the delimitation of the recharge areas, starting from the analysis of the distribution of flows. This model was crucial for delimiting the “reserve areas”, since it was able to simulate groundwater flows using both purely advective transport conditions (particle tracking technique), and more realistic conditions of advective and dispersive transport, by introducing dispersive parameters and using the Life Time Expectancy (LTE) reservoir distribution. The integrated use of “traditional” techniques of regional groundwater flow system monitoring (hydrochemistry, stable isotopic composition) and of dating techniques based on radioactive isotopes and anthropogenic tracers, provided a reliable support to the validation of flow and transport simulation model, oriented to identify recharge areas and “reserve areas” of future extraction of deep groundwater for drinking purpose.

Sign in / Sign up

Export Citation Format

Share Document