Hydrologic connectivity of oxbow lakes along the lower Guadalupe River,Texas: The influence of geomorphic and climatic controls on the “flood pulse concept”     

Paul F. Hudson  Franklin T. Heitmuller  Maraigh B. Leitch 《Journal of Hydrology》2012

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Interaction of Vermiculite with Pb(II), Cd(II), Cu(II) and Ni(II) Ions in Single and Quaternary Mixtures          下载免费PDF全文

Kuppusamy Vijayaraghavan  Franklin D. Raja 《洁净——土壤、空气、水》2015,43(8):1174-1180

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Potassium Permanganate Doped Geopolymers for Remedial Applications     

Utku Solpuker  Zachary Cotter  Yongje Kim  Franklin W. Schwartz 《Ground Water Monitoring & Remediation》2014,34(4):93-101

This study investigates the use of KMnO₄ doped geopolymers as controlled‐release materials for remedial applications. The geopolymers were prepared by mixing alkali activated Na‐silicate solutions, metakaolin, and various amounts of granular KMnO₄. Samples were heat treated at 75 °C for 48 h. Concentrations of KMnO₄ in samples 1, 2, and 3 were 1.40 × 10^?1, 4.63 × 10^?1, and 6.07 × 10^?1 g/cm³, respectively. 1D column experiments showed that a high MnO₄^? release rate lasted for the first few hours, followed by a gradual decrease of MnO₄^? release. Neither cracks nor surface erosion of the geopolymers were observed throughout the experiments. Sample 1 approached exhaustion at the end of the Day 7. It took about 18 d for exhaustion of KMnO₄ releases in samples 2 and 3. Modeling of the observed KMnO₄ releases suggested diffusion and dissolution‐related fast transport as the most important mechanisms. This latter mechanism involves the creation of a connected secondary porosity in the geopolymers by dissolution of KMnO₄ granules. The contribution of Fickian diffusion to the total release decreased as the KMnO₄ content of the samples increased, and the dissolution mechanism became increasingly important.  相似文献   

Ambiguous Hydraulic Heads and 14C Activities in Transient Regional Flow     

Franklin W. Schwartz  Edward A. Sudicky  Robert G. McLaren  Young-Jin Park  Matthew Huber  Mick Apted 《Ground water》2010,48(3):366-379

A regional flow and transport model is used to explore the implications of significant variability in Pleistocene and Holocene climates on hydraulic heads and ¹⁴C activity. Simulations involve a 39 km slice of the Death Valley Flow System through Yucca Mountain toward the Amargosa Desert. The long-time scale over which infiltration has changed (tens-of-thousands of years) is matched by the large physical extent of the flow system (many tens-of-kilometers). Estimated paleo-infiltration rates were estimated using a juniper pollen percentage that extends from the last interglacial (LIG) period (approximately 120 kyrbp) to present. Flow and ¹⁴C transport simulations show that groundwater flow changes markedly as a function of paleoclimate. At the last glacial maximum (LGM, 21 kyrbp), the recharge to the flow system was about an order-of-magnitude higher than present, and water table was more than 100 m higher. With large basin time constants, flow is complicated because hydraulic heads at a given location reflect conditions of the past, but at another location the flow may reflect present conditions. This complexity is also manifested by processes that depend on flow, for example ¹⁴C transport. Without a model that accounts for the historical transients in recharge for at least the last 20,000 years, there is no simple way to deconvolve the ¹⁴C dates to explain patterns of flow.  相似文献   

Analysis of laboratory data on ultrasonic monitoring of permeability reduction due to biopolymer formation in unconsolidated granular media          下载免费PDF全文

J.G. Berryman  T.‐H. Kwon  S. Dou  J.B. Ajo‐Franklin  S.S. Hubbard 《Geophysical Prospecting》2016,64(2):445-455

We show how to estimate the fluid permeability changes due to accumulated biopolymer within the pore space of a granular material using laboratory measurements of overall permeability, together with various well‐known quantitative measures (e.g., porosity, specific surface area, and formation factor) of the granular medium microstructure. The main focus of the paper is on mutual validation of existing theory and a synthesis of new experimental results. We find that the theory and data are in good agreement within normal experimental uncertainties. We also establish quantitative empirical relationships between seismic and/or acoustic attenuation and overall permeability for these same systems.  相似文献   

Sea-cave temperature measurements and amino acid geochronology of British Late Pleistocene Sea stands     

John T. Hollin  Franklin L. Smith  John T. Renouf  D. Graham Jenkins 《第四纪科学杂志》1993,8(4):359-364

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THE PIEZOMETRIC PERMEABILITY PROFILER     

William H. Black  Allan Culley  Jan Divis  Franklin D. Patton 《Ground Water Monitoring & Remediation》1983,3(4):17-25

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Triaxial strength of rock materials   总被引：4，自引：0，他引：4  

John A. Franklin 《Rock Mechanics and Rock Engineering》1971,3(2):86-98

SummaryTriaxial Strength of Rock Materials An attempt is made to define the nature and purposes of triaxial strength criteria, also to outline some factors to be considered in their selection and use.Seven alternative empirical strength criteria are compared on the basis of their simplicity and their fit to data for some fifteen hundred rock and concrete specimens. Two of these, one linear and one curved, are then compared in detail. Use of the curved rather than the linear criterion resulted in a significant reduction in strength prediction error.Methods of fitting the criteria to strength data are described. The parameters of the two criteria are then used to compare and classify rocks on the basis of their triaxial strength behaviour. Possible alternative formulations of the two criteria are considered in an appendix.

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ZusammenfassungDreiaxiale Festigkeit von Fels Es wird ein Versuch unternommen, Art und Zweck dreiaxialer Festigkeitskriterien zu bestimmen und einige derjenigen Faktoren zu ermitteln, die bei deren Auswahl und Anwendung von Bedeutung sind.Sieben verschiedene empirische Festigkeitskriterien werden nach ihrer Einfachheit und ihrer Übereinstimmung mit ungefähr 1500 Fels- und Betonproben verglichen. Zwei davon, eine linear und eine nicht linear, werden dann näher miteinander verglichen. Das nicht lineare Kriterium ergab, im Gegensatz zum linearen, eine bedeutende Verringerung des Fehlers in der Festigkeitsvorhersage.Methoden für die Anpassung der Kriterien an die Festigkeitsermittlungen werden beschrieben. Die Parameter der beiden Kriterien werden dann benützt, um Gesteine aufgrund ihres dreiaxialen Festigkeitverhaltens zu klassifizieren. Mögliche Alternativformulierungen der beiden Kriterien werden im Anhang behandelt.

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RésuméRésistance triaxiale de matériaux rocheux Une tentative est faite pour définir la nature et le but des critères de résistance triaxiale et aussi pour dégager les quelques facteurs devant être considérés pour leur choix et leur utilisation.Sept critères empiriques différents de résistance sont comparés sur le plan simplicité et concordance des mesures faites sur 1500 échantillons de roche et de béton. Deux de ces critéres, l'un linéaire, l'autre curviligne, sont ensuite comparés dans le detail. L'utilisation du critère curviligne plutôt que linéaire entraine une réduction notable de l'erreur dans la prédiction des résistances.Des méthodes d'ajustement des critères aux résistances mesurées sont décrites. Les paramètres des deux critères retenus sont ensuite utilisés pour comparer et classer les roches en fonction de leur comportement triaxial. En annexe, quelques autres possibilités de formulation des deux critères sont explicitées.

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With 7 Figures  相似文献