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It was noted that biofilm loss rate due to shear stress was influenced by the composition of the porous medium with losses being higher on smooth surface sands relative to activated carbon.
In this instance we are testing the effects of abstraction only within a fractured rock aquifer with no water or solute injection.
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The concentration and flux of organic carbon in aquifers is influenced by recharge and abstraction, and surface and subsurface processing.
In this study groundwater was abstracted from a shallow fractured rock aquifer and dissolved organic carbon (DOC) was measured in observation bores at different distances from the abstraction bore.
We expect that shearing of biofilms would in this scenario play the major role in DOM mobilisation.
In this study we aim to identify changes in DOC characteristics and concentrations within a highly stressed aquifer.
In addition subsurface flows that include groundwater interactions with the soil horizon, vegetation, or buried carbon lenses can cause significant variations in DOC distribution and concentrations in terrestrial waters.
Attenuation of DOC in soils is understood to be directly controlled by adsorption, co-precipitation and biodegradation.The analysis of the variations in DOC within an aquifer during an abstraction experiment has not been undertaken before. The fractured rock system outcrops in the upper reaches of the slope (approximately 100 metres south of the bore field) and becomes deeper down the slope to approximately 7 mbgl at the abstraction location.The experiment was undertaken at the UNSW Wellington Research Station in the central west of NSW, Australia (Fig. Figure 1: Site location, regional topography and relative bore locations (3.1.1 LPI asserts the right to be attributed as author of the original material in the following manner: ©Land and Property Information (date of extraction 19/02/2015)).One possible mechanism of DOC release during abstraction is the erosion of biofilms and colloids or sloughing of biofilms from aquifer surfaces due to increased water velocity or shear stress.Research into the effect of water velocity and shear stress on colloid stability and biofilm erosion or sloughing has been limited to drinking water supply pipelines found that shear strength were a significant mechanism controlling biomass development in a porous medium where water was injected for bioremediation purposes.When the aquifer is not being pumped, DOC mobilisation in the aquifer is low.Tags: Adult Dating, affair dating, sex dating