Conceptual Site Model Development and Phased Remedy Implementation to Achieve Vapor Screening Goals at a Former Dry Cleaner

2014 ◽  
Vol 24 (4) ◽  
pp. 107-126
Author(s):  
Michael Jordan
Keyword(s):  
Model Development ◽  
Site Model ◽  
Conceptual Site Model

scholarly journals Relaxometry Models Compared with Bayesian Technique: Ganglioside Micelle Example

2020 ◽  
Author(s):  
Pär Håkansson
Keyword(s):  
Model Comparison ◽  
Spin Dynamics ◽  
Model Development ◽  
Relaxation Dispersion ◽  
Site Model ◽  
Research Areas ◽  
Bayesian Model Comparison ◽  
Physico Chemical ◽  
Complex Liquids ◽  
Bayesian Evidence

<div> <div> <div> <p>In this work a methodology to perform Bayesian model-comparison is developed and exemplified in the analysis of magnetic relaxation dispersion (NMRD) experiments of water in Ganglioside micelle system. The NMRD powerful probe of slow dynamics in complex liquids is obtained. There are many interesting systems to study with NMRD, such as ionic and Lyotropic liquids or electrolytes. However, to progress in the understanding of the physical chemistry of studied systems relatively detailed theoretical NMRD-models are required. To improve the models they need to be carefully compared, in addition to physico-chemical considerations of molecular and spin dynamics. The comparison is performed by computing the Bayesian evidence in terms of a thermodynamic integral solved with Markov chain Monte Carlo. The result leads to a conclusion of two micelle water sites, and rules out lower and higher complexity level, i.e., one and three sites. In contrast, and provided only with the quality of best fit, suggest a three site model. The two approximate selection tools, Akaike and Baysian information criterions, may lead to wrong conclusions compared to the the full integration. The methodology is expected to be one of several important tools in NMRD model development, however, is completely general and should find awakened use in many research areas. </p> </div> </div> </div>

scholarly journals Resistivity Piezocone in the Conceptual Site Model Definition

2017 ◽  
Vol 40 (2) ◽  
pp. 93-107
Author(s):  
Marcos Tanaka Riyis ◽  
Heraldo Luiz Giacheti
Keyword(s):  
Site Model ◽  
Conceptual Site Model

scholarly journals Use of Radiocarbon Ages to Narrow Groundwater Recharge Estimates in the Southeastern Mojave Desert, USA

Hydrology ◽  
2018 ◽  
Vol 5 (3) ◽  
pp. 51 ◽  
Author(s):  
Adam Love ◽  
Andy Zdon
Keyword(s):  
Groundwater Recharge ◽  
Land Surface ◽  
Mojave Desert ◽  
Groundwater Age ◽  
Age Dating ◽  
Local Climate ◽  
Site Model ◽  
Conceptual Site Model ◽  
Isotopic Analyses ◽  
Wide Range

Estimating groundwater recharge in arid or semiarid regions can be a difficult and complex task, since it is dependent on a highly variable set of spatial and temporal hydrologic parameters and processes that are dependent on the local climate, the land surface properties, and subsurface characteristics. As a result, traditional methods for estimating the recharge can result in a wide range of derived values. This is evident in the southeastern Mojave Desert, where calculated recharge estimates by previous investigators that range over an order of magnitude (from ~2500 to ~37,000 acre feet per year) are reported. To narrow down this large span of recharge estimates to narrower and more plausible values, this study evaluates the previous recharge estimates in this region, to examine the sources of variability in the reported results and to constrain the recharge estimates based on the hydrologic conditions and the radiocarbon age-dating of spring flows—even without knowledge of the precise subsurface hydrology. The groundwater age and perennial flow characteristics of springs in this study could not be derived from waters sourced solely from local recharge. Therefore, the springs in this study require a significant groundwater contribution to their overall discharge. A previously described conceptual site model in the region established that Bonanza Spring is similarly hydrologically connected to the regional basin-fill aquifer, based on geologic and geochemical/isotopic analyses, and this conceptual site model for where perennial spring water is sourced should readily be extended to these other perennial springs in this region.

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