scholarly journals Groundwater recharge and flow processes as revealed by stable isotopes and geochemistry in fractured Hornblende-biotite-gneiss, Rivirivi Catchment, Malawi

2018 ◽  
Vol 12 (1) ◽  
pp. 1-14 ◽  
Author(s):  
Kambuku Dwight ◽  
Tsujimura Maki ◽  
Kagawa Shigeyoshi
Keyword(s):  
Stable Isotopes ◽  
Groundwater Recharge ◽  
Biotite Gneiss ◽  
Flow Processes

scholarly journals Assessments of seasonal groundwater recharge and discharge using environmental stable isotopes at Lower Muda River Basin, Malaysia

2018 ◽  
Vol 8 (5) ◽  
Author(s):  
Mohd Khairul Nizar Shamsuddin ◽  
Wan Nor Azmin Sulaiman ◽  
Mohammad Firuz Ramli ◽  
Faradiella Mohd Kusin ◽  
Kamarudin Samuding
Keyword(s):  
Stable Isotopes ◽  
Groundwater Recharge ◽  
River Basin

Groundwater recharge estimates combining soil isotope profiles and classical soil water monitoring techniques

2021 ◽  
Author(s):  
Nina Krüger ◽  
Christoph Külls ◽  
Marcel Kock
Keyword(s):  
Soil Moisture ◽  
Water Balance ◽  
Groundwater Recharge ◽  
Soil Water ◽  
Soil Profile ◽  
Tunable Diode Laser ◽  
Soil Water Balance ◽  
Advection Dispersion ◽  
Flow Processes ◽  
Percolation Rate

<p>To improve knowledge of hydrological and hydrogeological flow processes and their dependency on climate conditions it is becoming increasingly important to integrate sensors technology, independent observation methods, and new modeling techniques. Established isotope methods are usually regarded as a supplement and extension to classical hydrological investigation methods but are rarely included in soil water balance models. However, the combination could close knowledge gaps and thus lead to more precise and realistic predictions and therefore to better water management. Within the Wasserpfad project, a project of the Department of Civil Engineering at the TH Lübeck, soil moisture has been measured since May 2018. SMT100 soil moisture sensors from TRUEBNER GmbH are used at depths of 20, 40, 60, and 80 cm. Next to the station a 2m deep soil profile was taken in 2020, to estimate groundwater recharge using stable isotope equilibration methods and cryogenic extraction combined with soil water balance modeling. Vertical profiles of stable isotopes have been determined with a 10-cm resolution and measured with Tunable Diode Laser spectrometry. Percolation through the soil profile has been estimated based on the convolution of a seasonal input function using advection-dispersion transport models. Percolation rate estimate based on environmental isotope profiles results in 230 mm per year. Fitting of the advection-dispersion equation using a sinusoidal isotope input fitted to available time series provides an estimate of 255 mm per year. This difference is due to the dispersion effect on the isotope minima and maxima. The result of modeling the soil moisture data with a soil water balance model integrating the Richards equation for water transport and Penmen-Monteith based calculation of actual evaporation is used to verify the percolation rates. The analysis of soil moisture and isotope data by modeling provides a direct and efficient way to estimate the percolation rate. The combination of isotope methods with classical hydrological measuring techniques offers the possibility to verify results, to calibrate models, or to investigate the limits of isotope methods. Thus, flow processes can be predicted more reliably in the future.</p>

Using stable isotopes to quantify ecohydrological flux dynamics at the soil-plant-atmosphere continuum in urban green spaces

2020 ◽  
Author(s):  
Lena-Marie Kuhlemann ◽  
Doerthe Tetzlaff ◽  
Birgit Kleinschmit ◽  
Stenka Vulova ◽  
Chris Soulsby
Keyword(s):  
Stable Isotopes ◽  
Soil Moisture ◽  
Groundwater Recharge ◽  
Green Spaces ◽  
Convective Precipitation ◽  
Urban Water ◽  
Water Fluxes ◽  
Urban Green ◽  
Urban Green Spaces ◽  
Water Partitioning

<p>Urban areas, more than many experimental catchments, are characterized by a markedly heterogeneous distribution of land covers, with different degrees of permeability that radically vary partitioning of precipitation into evapotranspiration (“green” water fluxes) and runoff and groundwater recharge (“blue” water fluxes). While the quantification of ecohydrological fluxes using stable isotopes in water as environmental tracers has been an established method for many years, surprisingly few studies have been applied to the highly complex urban water cycle. To determine the effects of representative urban green space “types” on water partitioning, we carried out plot-scale studies at a heterogenous field site in Berlin-Steglitz that integrates climate, soil moisture and sap flow data, with isotope sampling of precipitation and soil moisture on a regular basis. Soil moisture and isotope measurements were conducted at different depths and under contrasting soil-vegetation units (grassland, trees, shrub) with different degrees of permeability. Our investigations revealed uniformly decreasing soil moisture content during the dry summer of 2019, with only temporary re-wetting of the uppermost soil layers despite heavy convective precipitation events. Soils under trees were driest, whilst grassland soils were wettest, with shrubs intermediate. Isotope-based modelling indicated that this was the result, of greater interception, transpiration and – surprisingly – soil evaporation from forest sites. The isotope signatures of soil water also revealed stronger “memory effects” of summer drying in forest soils, which persisted until the major re-wetting of the system in autumn allowed drainage from the soil profile to contribute to groundwater recharge. Modelling showed that recharge under grasslands could be over 3 times higher compared to under trees and shrubs. Upscaling these findings with large-scale isotope studies of surface and groundwater across Berlin highlights the importance of the vegetation in urban green spaces to water partitioning in heterogeneous city landscapes and the need for careful integration of vegetation management in urban water and land use planning.</p>

scholarly journals Identifying Groundwater Recharge Sites through Environmental Stable Isotopes in an Alluvial Aquifer

Water ◽  
2017 ◽  
Vol 9 (8) ◽  
pp. 569 ◽  
Author(s):  
Julián González-Trinidad ◽  
Anuard Pacheco-Guerrero ◽  
Hugo Júnez-Ferreira ◽  
Carlos Bautista-Capetillo ◽  
Arturo Hernández-Antonio
Keyword(s):  
Stable Isotopes ◽  
Groundwater Recharge ◽  
Alluvial Aquifer

Stable isotopes of precipitation and groundwater provide new insight into groundwater recharge and flow in a structurally complex hydrogeologic system: West Hawai‘i, USA

2020 ◽  
Vol 28 (4) ◽  
pp. 1191-1207 ◽  
Author(s):  
Joseph K. Fackrell ◽  
Craig R. Glenn ◽  
Donald Thomas ◽  
Robert Whittier ◽  
Brian N. Popp
Keyword(s):  
Stable Isotopes ◽  
Groundwater Recharge ◽  
Insight Into

scholarly journals Tracing sources of stormflow and groundwater recharge in an urban, semi-arid watershed using stable isotopes

2021 ◽  
Vol 34 ◽  
pp. 100806
Author(s):  
Sierra Wallace ◽  
Trent Biggs ◽  
Chun-Ta Lai ◽  
Hilary McMillan
Keyword(s):  
Stable Isotopes ◽  
Groundwater Recharge ◽  
Semi Arid
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