Use of chloride mass balance and tritium data for estimation of groundwater recharge and renewal rate in an unconfined aquifer from North Africa: a case study from Tunisia

2009 ◽  
Vol 60 (4) ◽  
pp. 861-871 ◽  
Author(s):  
Lassaad Dassi
Keyword(s):  
Mass Balance ◽  
Groundwater Recharge ◽  
North Africa ◽  
Unconfined Aquifer ◽  
Chloride Mass Balance ◽  
Renewal Rate

Groundwater recharge estimation in Undai watershed area, southern Mongolia

2020 ◽  
Author(s):  
Altantungalag Danzan ◽  
Buyankhishig Nemer ◽  
Enkhtuya Altangadas ◽  
Uuganbayar Purevsuren
Keyword(s):  
Mass Balance ◽  
Groundwater Recharge ◽  
Water Source ◽  
Daily Basis ◽  
Unconfined Aquifer ◽  
Gobi Desert ◽  
Chloride Mass Balance ◽  
Watershed Area ◽  
The People ◽  
Recharge Estimation

<p>Recharge estimation in arid and semi-arid areas is complicated. As for the country where the potable water for both the people and livestock is supplied from shallow unconfined aquifer due to the lack of existing ground water, the recharge estimation is crucial to water source management. However, since the deficiency of available data, such estimation has not been completed in the Gobi desert of Mongolia. Water-bearing rock units of the Undai river basin consist of Upper Quaternary alluvial-proluvial sands, gravels and pebbles. In this paper, direct recharge was estimated using chloride mass balance (CMB) and rainfall infiltration breakthrough (RIB) model in shallow unconfined aquifer, Undai watershed area Southern Mongolia.  As a result of groundwater recharge estimation survey conducted in 2018, the annual mean recharge of the groundwater along the Undai dry riverbed is calculated to be 13.7mm/year according to RIB model based on the water level fluctuation, which makes up 6.3% of total precipitation and 21.7mm/year according to CMB (chloride mass balance), which comprises 10% of the total annual precipitation. The largest recharge estimates were determined using the daily basis RIB method and the smallest estimates were determined using the chloride-mass-balance method.</p>

scholarly journals Catchment conceptualisation for examining applicability of chloride mass balance method in an area with historical forest clearance

2010 ◽  
Vol 14 (7) ◽  
pp. 1233-1245 ◽  
Author(s):  
H. Guan ◽  
A. J. Love ◽  
C. T. Simmons ◽  
J. Hutson ◽  
Z. Ding
Keyword(s):  
Mass Balance ◽  
Groundwater Recharge ◽  
Chloride Concentration ◽  
Water Transfer ◽  
Annual Precipitation ◽  
Chloride Mass Balance ◽  
Balance Condition ◽  
Forest Clearance ◽  
Type V ◽  
Historical Forest

Abstract. Of the various approaches for estimating groundwater recharge, the chloride mass balance (CMB) method is one of the most frequently used, especially for arid and semiarid regions. Widespread native vegetation clearance, common in many areas globally, has changed the land surface boundary condition, posing the question as to whether the current system has reached new chloride equilibrium, required for a CMB application. Although a one-dimensional CMB can be applied at a point where the water and chloride fluxes are locally in steady state, the CMB method is usually applied at a catchment scale owing to significant lateral flows in mountains. The applicability of the CMB method to several conceptual catchment types of various chloride equilibrium conditions is examined. The conceptualisation, combined with some local climate conditions, is shown to be useful in assessing whether or not a catchment has reached new chloride equilibrium. The six conceptual catchment types are tested with eleven selected catchments in the Mount Lofty Ranges (MLR), a coastal hilly area in South Australia having experienced widespread historical forest clearance. The results show that six of the eleven catchments match a type VI chloride balance condition (chloride non-equilibrium with a gaining stream), with the ratios of stream chloride output (O) over atmospheric chloride input (I), or catchment chloride O/I ratios, ranging from 2 to 4. Two catchments match a type V chloride balance condition (chloride non-equilibrium with a losing stream), with catchment chloride O/I ratios about 0.5. For these type V and type VI catchments, the CMB method is not applicable. The results also suggest that neither a chloride O/I ratio less than one nor a low seasonal fluctuation of streamflow chloride concentration (a factor below 4) guarantees a chloride equilibrium condition in the study area. A large chloride O/I value (above one) and a large fluctuation of streamflow chloride concentration (a factor of 10 and above) generally indicates either a chloride disequilibrium, or cross-catchment water transfer, or both, for which the CMB method is not applicable. Based on regression between chloride O/I values and annual precipitation for type VI catchments, a catchment with annual precipitation of 900 mm in MLR has most likely reached new chloride equilibrium, and the CMB method can be applied if no cross-catchment water transfer occurs. CMB is applied to one catchment at chloride equilibrium, suggesting a net groundwater recharge of 27 mm/yr, about 3% of annual precipitation.

Estimating groundwater recharge and its associated uncertainty: Use of regression kriging and the chloride mass balance method

2018 ◽  
Vol 561 ◽  
pp. 1063-1080 ◽  
Author(s):  
Russell S. Crosbie ◽  
Luk J.M. Peeters ◽  
Natasha Herron ◽  
Tim R. McVicar ◽  
Alexander Herr
Keyword(s):  
Mass Balance ◽  
Groundwater Recharge ◽  
Balance Method ◽  
Regression Kriging ◽  
Chloride Mass Balance ◽  
Mass Balance Method
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