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Papers by Calvin Miller
... Title: An address delivered at the Beeson Institute series, (1998, October 8). Other Titles: ... more ... Title: An address delivered at the Beeson Institute series, (1998, October 8). Other Titles: Small Groups and Children - Part 1. Authors: Douglas, Sherry. Keywords: Church Work With Children. Issue Date: 11-Feb-2011. Series/Report no.: ATS;98B35a. ...
A widely-used semi-analytical model (the "SDF method") describing stream depletions and accretion... more A widely-used semi-analytical model (the "SDF method") describing stream depletions and accretions induced from groundwater pumping and augmented groundwater recharge was reviewed for accuracy when applied in bounded alluvial aquifers. The SDF method is based on the Glover analysis of stream depletion induced by groundwater pumping in a mathematically ideal aquifer, but uses a model-derived input parameter to account for non-ideal conditions such as variable transmissivities and nearby aquifer boundaries. Though it is still an approximation, this parameter adjustment can increase the accuracy of estimates. This modeled parameter is called the Stream Depletion Factor (SDF) and has units of time. The spatial distribution of SDF values was modeled and mapped by the USGS for the alluvial aquifers of the South Platte and Arkansas rivers. The SDF method yields small errors near the time of the SDF, but recent experience has highlighted the larger errors at times much greater than the SDF. In light of this, users have been prompted to use the Glover method combined with the method of images to account for aquifer boundaries. Yet, this approach is not without its own challenges. This paper reviews the approximations inherent in the SDF method and presents expanded SDF response curves and error curves as functions of well position within the bounded aquifer. It is shown that SDF values mapped in the half of the aquifer nearest the river do not account for aquifer boundaries, and that values in the other half follow a predictable adjustment. By removing the boundary-induced adjustments, the method of images can be used with the SDF method as well as the Glover Method, thereby benefiting from the additional information contained in SDF maps and retaining their value as standardized references for water rights administration.
Ground Water, 2007
A semianalytical method commonly used for quantifying stream depletion caused by ground water pum... more A semianalytical method commonly used for quantifying stream depletion caused by ground water pumping was reviewed for applicability in narrow alluvial aquifers. This stream depletion factor (SDF) method is based on the analytic Glover model, but uses a numerical model-derived input parameter, called the SDF, to partly account for mathematically nonideal conditions such as variable transmissivity and nearby aquifer boundaries. Using the SDF can improve and simplify depletion estimates. However, the method's approximations introduce error that increases with proximity to the impermeable aquifer boundary. This article reviews the history of the method and its assumptions. New stream depletion response curves are presented as functions of well position within bounded aquifers. A simple modification to modeled SDF values is proposed that allows the impermeable boundary to be accounted for with image wells, but without overaccounting for boundary effects that are already reflected in modeled SDFs. It is shown that SDFs for locations closer to the river than to the aquifer boundary do not reflect impermeable-boundary effects, and thus need no modification, and boundary effects in the other portion of the aquifer follow a predictable removable pattern. This method is verified by comparing response curves using modified SDFs with response curves from an extensively calibrated numerical model of a managed ground water recharge site. The modification improves SDF-based stream depletion estimates in bounded aquifers while still benefiting from the additional information contained in SDF maps and retaining their value as standardized references for water rights administration.
Journal of the Optical Society of America, May 1, 1977
United States Patent [19] Miller et al. [ii] Patent Number: [45] Date of Patent: 4,919,509 Apr. 2... more United States Patent [19] Miller et al. [ii] Patent Number: [45] Date of Patent: 4,919,509 Apr. 24, 1990 [54] MECHANICAL CONNECTION FOR POLARIZATION-MAINTAINING OPTICAL FIBER AND METHODS OF MAKING [75] Inventors: Calvin M. Miller, ...
... Title: An address delivered at the Beeson Institute series, (1998, October 8). Other Titles: ... more ... Title: An address delivered at the Beeson Institute series, (1998, October 8). Other Titles: Small Groups and Children - Part 1. Authors: Douglas, Sherry. Keywords: Church Work With Children. Issue Date: 11-Feb-2011. Series/Report no.: ATS;98B35a. ...
A widely-used semi-analytical model (the "SDF method") describing stream depletions and accretion... more A widely-used semi-analytical model (the "SDF method") describing stream depletions and accretions induced from groundwater pumping and augmented groundwater recharge was reviewed for accuracy when applied in bounded alluvial aquifers. The SDF method is based on the Glover analysis of stream depletion induced by groundwater pumping in a mathematically ideal aquifer, but uses a model-derived input parameter to account for non-ideal conditions such as variable transmissivities and nearby aquifer boundaries. Though it is still an approximation, this parameter adjustment can increase the accuracy of estimates. This modeled parameter is called the Stream Depletion Factor (SDF) and has units of time. The spatial distribution of SDF values was modeled and mapped by the USGS for the alluvial aquifers of the South Platte and Arkansas rivers. The SDF method yields small errors near the time of the SDF, but recent experience has highlighted the larger errors at times much greater than the SDF. In light of this, users have been prompted to use the Glover method combined with the method of images to account for aquifer boundaries. Yet, this approach is not without its own challenges. This paper reviews the approximations inherent in the SDF method and presents expanded SDF response curves and error curves as functions of well position within the bounded aquifer. It is shown that SDF values mapped in the half of the aquifer nearest the river do not account for aquifer boundaries, and that values in the other half follow a predictable adjustment. By removing the boundary-induced adjustments, the method of images can be used with the SDF method as well as the Glover Method, thereby benefiting from the additional information contained in SDF maps and retaining their value as standardized references for water rights administration.
Ground Water, 2007
A semianalytical method commonly used for quantifying stream depletion caused by ground water pum... more A semianalytical method commonly used for quantifying stream depletion caused by ground water pumping was reviewed for applicability in narrow alluvial aquifers. This stream depletion factor (SDF) method is based on the analytic Glover model, but uses a numerical model-derived input parameter, called the SDF, to partly account for mathematically nonideal conditions such as variable transmissivity and nearby aquifer boundaries. Using the SDF can improve and simplify depletion estimates. However, the method's approximations introduce error that increases with proximity to the impermeable aquifer boundary. This article reviews the history of the method and its assumptions. New stream depletion response curves are presented as functions of well position within bounded aquifers. A simple modification to modeled SDF values is proposed that allows the impermeable boundary to be accounted for with image wells, but without overaccounting for boundary effects that are already reflected in modeled SDFs. It is shown that SDFs for locations closer to the river than to the aquifer boundary do not reflect impermeable-boundary effects, and thus need no modification, and boundary effects in the other portion of the aquifer follow a predictable removable pattern. This method is verified by comparing response curves using modified SDFs with response curves from an extensively calibrated numerical model of a managed ground water recharge site. The modification improves SDF-based stream depletion estimates in bounded aquifers while still benefiting from the additional information contained in SDF maps and retaining their value as standardized references for water rights administration.
Journal of the Optical Society of America, May 1, 1977
United States Patent [19] Miller et al. [ii] Patent Number: [45] Date of Patent: 4,919,509 Apr. 2... more United States Patent [19] Miller et al. [ii] Patent Number: [45] Date of Patent: 4,919,509 Apr. 24, 1990 [54] MECHANICAL CONNECTION FOR POLARIZATION-MAINTAINING OPTICAL FIBER AND METHODS OF MAKING [75] Inventors: Calvin M. Miller, ...