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Demin, A. P.; Ismaiylov, G. Kh.

doi:10.1023/a:1023846616144

Cited by 4 publications

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“…The zeta potential was measured using the same methodology as for the emulsion droplets. Since the F-65 and F-95 particles used in the column experiments were too big to oscillate in the electric field generated by the ESA apparatus, #40 quartz (U.S. Silica, Berkeley Springs, WV), with a median particle diameter of 5.1 µm, was utilized for these measurements, similar to the protocol outlined by Demond et al (32). To obtain the pore-size distribution, the drainage air-water capillary pressure-saturation relationships were measured using the pressure cell and procedure developed by Salehzadeh and Demond (33).…”

Section: Methodsmentioning

confidence: 99%

“…These data were fitted with the equation given by van Genuchten (34) using the statistical package SYSTAT (SPSS, Chicago, IL). Then using the Young-Laplace equation (35), the capillary pressure was converted to a pore diameter (36,37), assuming that the contact angle was approximately equal to 0°and that the surface tension of water was about 72 dyn/cm (32).…”

Section: Methodsmentioning

confidence: 99%

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Conductivity Reduction Due to Emulsification during Surfactant Enhanced-Aquifer Remediation. 1. Emulsion Transport

Jain

Demond

2002

Environ. Sci. Technol.

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Surfactant-enhanced aquifer remediation (SEAR) is a promising technology for the remediation of subsurface zones contaminated with organic liquids. To ensure the success of SEAR, the potential reduction in hydraulic conductivity must be evaluated. The objective of this study was to examine the process of conductivity reduction due to the transport of an emulsion, generated by mixing tetrachloroethylene with 4% solutions of two nonionic surfactants, in packed beds of sand-sized silica particles. The injection of the emulsion resulted in a 75-85% reduction in conductivity, depending on the properties of the surfactant and the porous medium. The greater viscosity of the emulsion relative to that of water accounted for about 25% of the reduction. The remainder was attributed to the clogging of the porous medium by the emulsion. The relative sizes of the emulsion droplets and the packed bed's pores, coupled with measurements of zeta potential of the emulsion droplets and silica particles, suggested that multilayer deposition was the principal mechanism of clogging. This hypothesis was corroborated by direct observation of the emulsion transport process in a micromodel. To simulate the reduction in hydraulic conductivity in these systems accurately, it was necessary to modify the emulsion transport model by Soo and Radke to include the phenomena of viscosity variation and multilayering.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Conductivity Reduction Due to Emulsification during Surfactant Enhanced-Aquifer Remediation. 1. Emulsion Transport

Jain

Demond

2002

Environ. Sci. Technol.

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Post‐damming Flow Regime Development in a Large Lowland River (Volga, Russian Federation): Implications for Floodplain Inundation and Fisheries

Górski

Bosch

Wolfshaar

et al. 2011

River Research & Apps

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Periodic flooding plays a key role in the ecology of floodplain rivers. Damming of such rivers can disturb flooding patterns and have a negative impact on commercial fish yield. The Volga River, the largest river in Europe, has a regulated flow regime after completion of a cascade of dams. Here, we study effects of damming on long-term discharge variability and flood pulse characteristics. In addition, we evaluate the effects of the altered flood pulse on floodplain ecosystem functioning and commercial fish yields. Our results indicate that both flood pulse and fish populations of the Volga-Akhtuba floodplain have varied considerably over the past decades. After damming, annual maximum peak discharges have decreased, minimum discharges increased, but average discharges remained similar to pre-damming conditions. Moreover, because of bed level incision of over 1.5 m, a higher discharge is needed to reach bankfull level and inundate the floodplains. Despite this significantly altered hydrological regime and subsequent morphological changes, current discharge management still provides significant spring flooding. However, commercial fish catches did decrease after damming, both in the main channel and in the floodplain lakes. All catches were dominated by species with a eurytopic flow preference, although catches from the main channel contained more rheophilic species, and floodplain catches contained more limnophilic and phytophilic species. The strong increase of opportunistic gibel carp (Carassius gibelio) around 1985 was apparent in the main channel and the floodplain lakes. Despite the hydrological changes, the decrease in overall catches, and the upsurge of gibel, we found a strong positive effect of flood magnitude in the previous year on commercial fish yield in the floodplain lakes. This suggests that under the current discharge management there still is an increased fish growth and/or survival during high floods and that functioning of the floodplain is at least partly intact.

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The role of anthropogenic and climatic factors in the transformation of loads on water resources in the Volga river basin

Demin

Болгов

Филиппова

2019

IOP Conf. Ser.: Earth Environ. Sci.

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It is shown that over the past 30-40 years, the Volga River basin has experienced a significant increase in its minimum flow in the winter low flow period. Data on water intake from surface and underground sources for 1985-2017 is given for the main tributaries. It is revealed that climatic and anthropogenic factors cause an almost similar effect on the change in the water resource utilization coefficient.

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Cited by 4 publications

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Conductivity Reduction Due to Emulsification during Surfactant Enhanced-Aquifer Remediation. 1. Emulsion Transport

Conductivity Reduction Due to Emulsification during Surfactant Enhanced-Aquifer Remediation. 1. Emulsion Transport

Post‐damming Flow Regime Development in a Large Lowland River (Volga, Russian Federation): Implications for Floodplain Inundation and Fisheries

The role of anthropogenic and climatic factors in the transformation of loads on water resources in the Volga river basin

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