Numerical Modeling of Hydraulic Fractures Interaction in Complex Naturally Fractured Formations   总被引：1，自引：0，他引：1  

Olga Kresse  Xiaowei Weng  Hongren Gu  Ruiting Wu 《Rock Mechanics and Rock Engineering》2013,46(3):555-568

A recently developed unconventional fracture model (UFM) is able to simulate complex fracture network propagation in a formation with pre-existing natural fractures. A method for computing the stress shadow from fracture branches in a complex hydraulic fracture network (HFN) based on an enhanced 2D displacement discontinuity method with correction for finite fracture height is implemented in UFM and is presented in detail including approach validation and examples. The influence of stress shadow effect from the HFN generated at previous treatment stage on the HFN propagation and shape at new stage is also discussed.  相似文献   

Simulation of subsurface heat and water dynamics, and runoff generation in mountainous permafrost conditions, in the Upper Kolyma River basin, Russia   总被引：1，自引：0，他引：1  

Olga Semenova  Liudmila Lebedeva  Yury Vinogradov 《Hydrogeology Journal》2013,21(1):107-119

The Hydrograph model (a distributed process-based model) was applied to the simulation of soil freeze-thaw and runoff processes, to assess the viability of the model approach and the influence of specific environmental factors in a permafrost environment. Three mountainous permafrost watersheds were studied, at the Kolyma Water Balance Station in north-eastern Russia. The watersheds include rocky talus, mountainous tundra and moist larch-forest landscape regimes, and they were modelled at daily time-steps for the period 1971–1984. Simulated results of soil freeze-thaw depth and runoff showed reasonable agreement with observed values. This study reveals and mathematically describes the dependence of surface and subsurface flow on thawing depth and landscape characteristics. Process analysis and modelling in permafrost regions, including ungauged basins, is suggested, with observable properties of landscapes being used as model parameters, combined with an appropriate level of physically based conceptualization.  相似文献   

Influence of the plasma zonal E × B drift on the electron concentration in the low-latitude ionospheric F region at the minimum of solar activity near the spring equinox     

A. V. Pavlov  N. M. Pavlova  A. D. Shevnin 《Geomagnetism and Aeronomy》2008,48(4):479-490

The three-dimensional nonstationary theoretical model of the concentrations and temperatures of electrons and ions in the ionospheric F region and plasmasphere at low and middle latitudes is used to study variations in the concentration NmF2 and height hmF2 of the ionospheric F2 layer under the action of the plasma zonal drift in the direction geomagnetic west-geomagnetic east perpendicularly to the electric E and geomagnetic B fields. The calculated and measured values of NmF2 and hmF2 for 16 ionospheric sounding stations during the quiet geomagnetic period on March 28–29, 1964 at low solar activity are compared. This comparison made it possible to correct the input parameters of the model: [O] from the NRLMSISE-00 model and the meridional component of the neutral wind velocity from the HWW90 model. It is shown that the nighttime NmF2 values decrease up to twice at low solar activity in the low-latitude ionosphere, and the hmF2 values change by up to 16 km, if the plasma zonal E×B drift is not taken into account. Under the daytime conditions, the influence of the plasma zonal E×B drift on NmF2 can be neglected.  相似文献   

Adaptation strategy of bivalve Modiolus modiolus from upwelling regions of the Kuril Islands shelf (Sea of Okhotsk) to heavy metal effects     

Victor Ya. Kavun  Olga V. Podgurskaya 《Continental Shelf Research》2009

Cd, Cu, Fe, Mn, Ni, Pb, Zn concentration in the organs (muscle, gonads, mantle, gills, digestive gland, kidney) of mussel Modiolus modiolus was studied. Mussels were collected from shelf upwelling sites of Kuril Is. Sea of Okhotsk (104 and 85 m) and, for comparison, coastal high contaminated and clean sites (Peter the Great Bay, Sea of Japan). It was found that mussels from shelf upwelling regions accumulated unusually high Cd concentration in studied organs, excepting digestive gland. Shelf mussels have evolved passive adaptation to elevated level of ambient heavy metals (distribution of heavy metal load between all organs, especially, muscle). In contrast, mussels from high contaminated sites have evolved active adaptation (strong regulation of metal concentration in the organs at the maximal permissible concentration due to increased kidney function). We supported that under natural condition, passive adaptation of aquatic organisms to increased ambient metal level have been evolved only under constant low-water temperature.  相似文献   

Diagenesis of Organic Matter in Eelgrass (Zostera marina L.) Vegetated Sediments     

Tishchenko  P. Ya.  Khodorenko  N. D.  Barabanshchikov  Yu. A.  Volkova  T. I.  Mar’yash  A. A.  Mikhailik  T. A.  Pavlova  G. Yu.  Sagalaev  S. G.  Semkin  P. Yu.  Tishchenko  P. P.  Shvetsova  M. G.  Shkirnikova  E. M. 《Oceanology》2020,60(3):341-352

Oceanology - In February and July 2014, multidisciplinary geochemical studies of the sediments were carried out at two stations. One of them was located in Voevoda Bight, which has a bottom depth...  相似文献   

Polarization of the light of the stars in the association Mon R1     

L. A. Pavlova  F. K. Rspaev 《Astrophysics》1985,23(3):674-677

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BVR observations of polarization parameters of stars in reflection nebulas     

L. A. Pavlova  F. K. Rspaev 《Astrophysics》1985,22(1):88-93

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Wave Climate in the Caspian Sea Based on Wave Hindcast     

S. A. Myslenkov  V. S. Arkhipkin  A. V. Pavlova  S. A. Dobrolyubov 《Russian Meteorology and Hydrology》2018,43(10):670-678

The results of wind wave hindcast for the Caspian Sea for the period of 1979–2017 are presented. The WAVEWATCHIII wave model and wind forcing from the NCEP/CFSR reanalysis are used. The modeling is performed on the unstructured grid with the spacing to 1 km in the coastal zone. Mean and extreme values of wave height, length, and period are provided. It is shown that the maximum height of waves of 3% probability of exceedance is 11.7 m. The interannual variability of wave parameters is analyzed. No unambiguous trend towards increase or decrease in the storm activity was revealed over the hindcasting period.  相似文献   

Sedimentation History of Neogene Lacustrine Sediments of Suseocka Bela Stena Based on Geochemical Parameters （Valjevo-Mionica Basin, Serbia）     

Aleksandra SAJNOVIC Vladimir SIMIC Branimir JOVANCICEVIC Olga CVETKOVIC Radovan DIMITRIJEVIC Nenad GRUBIN 《《地质学报》英文版》2008,82(6)

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Phytoplankton structure, composition and production in saline water-bodies in the Lower Amu Dar'ya     

Olga V. Babanazarova 《International Journal of Salt Lake Research》1997,6(3):217-231

Phytoplankton and its production in water-bodies of the lower Amu Dar'ya were investigated in 1984–1989. The structure and functional nature of the phytoplankton in the water-bodies studied were analogous to those of the littoral zone of eutrophic lakes, considering hydrological and hydrochemical conditions. The very high average annual P/B ratios (453–582) are considered as regional features, namely high light intensity and prolonged light period, the salinity usual for saline waters under anthropogenic influence, the frequent and discrete income of nutrients in drainage water and from sediments.  相似文献