3/9/2023 0 Comments Hydraulic gradientThe illustration shows the results for sand lens unit number 1 (see Figure 2).įigure S2: Illustration of the parameters used to estimate the vertical hydraulic gradient for the MiHPT log and two wells. The bore logs of the wells are shown to the right. The blue triangles are the dissipation test used to estimate the vertical hydraulic gradient. The third graph is the hydraulic head for the MiHPT log (H23), well W06 (black) and well W20 (blue), where the vertical line indicates screen placement and length. The two graphs to the left are EC and corrected HPT pressure. In this case study, performance of additional dissipationtests during the HPT log to acquire determination of the vertical hydraulic gradient increased the cost by 3% compared to standard HPT logs.įigure S1: Illustration of the parameters used to estimate the vertical hydraulic gradient for the MiHPT log and two wells. The advantage of the MiHPT is its relatively quick depth discrete access to information regarding subsurface permeability, vertical hydraulic gradients and contaminant distribution across a site. The parameter with the largest discrepancy was the thickness of the clay till. The hydraulic head, clay till thickness, and resulting vertical hydraulic gradients found using the MiHPT compared well with observations from nearby nested wells. Only the HPT is necessary for the estimate of vertical hydraulic gradient. This study focuses on advancing the use of the combined membrane interface probe hydraulic profiling tool (MiHPT) to investigate the vertical hydraulic gradient across a clay till overlying a sandy aquifer at a contaminated site in Denmark. The key parameters for estimating CMD are the contaminant source area and concentration, and the vertical water flux, the latter of which depends on the vertical hydraulic conductivity and the vertical hydraulic gradient in the subsurface. The vertical transport of contaminants from source areas is employed in many risk assessment models and screening tools in order to estimate the contaminant mass discharge (CMD) into underlying aquifers.
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