Application of Geographic Information Systems to Analyses and Modeling of Hydrocarbons Anomaly in Yakla,North Tarim Basin,Xinjiang,China     

Mohammad Reza Hosseinnejad 《中国地质大学学报(英文版)》1998,9(2):2

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Petrology of Igneous Rocks in Northern Golpayegan, Iran     

Mohammad Ebrahimi 《中国地质大学学报(英文版)》1998,9(1):2

ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｓｔｕｄｉｅｄａｒｅａｉｓｌｏｃａｔｅｄｉｎｔｈｅｎｏｒｔｈｏｆＧｏｌｐａｙｅｇａｎ,Ｉｒａｎ,ｂｏｕｎｄｅｄｂｙｌａｔｉｔｕｄｅｓ３３．３１°Ｎａｎｄ３３．３７°Ｎａｎｄｌｏｎｇｉ－ｔｕｄｅｓ５０．１１°Ｅａｎｄ５０．...  相似文献   

Identification of a hydrodynamic threshold in karst rocks from the Biscayne Aquifer, south Florida, USA   总被引：1，自引：1，他引：0  

Vincent J. DiFrenna  René M. Price  M. Reza Savabi 《Hydrogeology Journal》2008,16(1):31-42

A hydrodynamic threshold between Darcian and non-Darcian flow conditions was found to occur in cubes of Key Largo Limestone from Florida, USA (one cube measuring 0.2 m on each side, the other 0.3 m) at an effective porosity of 33% and a hydraulic conductivity of 10 m/day. Below these values, flow was laminar and could be described as Darcian. Above these values, hydraulic conductivity increased greatly and flow was non-laminar. Reynolds numbers (Re) for these experiments ranged from <0.1 to 7. Non-laminar flow conditions observed in the hydraulic conductivity tests were observed at Re close to 1. Hydraulic conductivity was measured on all three axes in a permeameter designed specifically for samples of these sizes. Positive identification of vertical and horizontal axes as well as 100% recovery for each sample was achieved. Total porosity was determined by a drying and weighing method, while effective porosity was determined by a submersion method. Bulk density, total porosity and effective porosity of the Key Largo Limestone cubes averaged 1.5 g/cm³, 40 and 30%, respectively. Two regions of anisotropy were observed, one close to the ground surface, where vertical flow dominated, and the other associated with a dense-laminar layer, below which horizontal flow dominated.  相似文献   

Elasto‐plastic analytical model for the design of grouted bolts in a Hoek–Brown medium     

Reza. R. Osgoui  Pierpaolo Oreste 《国际地质力学数值与分析法杂志》2010,34(16):1651-1686

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A coupled tide-wave model for the NW European shelf seas     

M. Reza Hashemi  Simon P. Neill  Alan G. Davies 《地球物理与天体物理流体动力学》2015,109(3):234-253

Understanding the interaction of tides and waves is essential in many studies, including marine renewable energy, sediment transport, long-term seabed morphodynamics, storm surges and the impacts of climate change. In the present research, a COAWST model of the NW European shelf seas has been developed and applied to a number of physical processes. Although many aspects of wave–current interaction can be investigated by this model, our focus is on the interaction of barotropic tides and waves at shelf scale. While the COWAST model was about five times more computationally expensive than running decoupled ROMS (ocean model) and SWAN (wave model), it provided an integrated modelling system which could incorporate many wave–tide interaction processes, and produce the tide and wave parameters in a unified file system with a convenient post-processing capacity. Some applications of the model such as the effect of tides on quantifying the wave energy resource, which exceeded 10% in parts of the region, and the effect of waves on the calculation of the bottom stress, which was dominant in parts of the North Sea and Scotland, during an energetic wave period are presented, and some challenges are discussed. It was also shown that the model performance in the prediction of the wave parameters can improve by 25% in some places where the wave-tide interaction is significant.  相似文献   

Ambient noise surface wave tomography of the Makran subduction zone,south-east Iran:Implications for crustal and uppermost mantle structures     

Mahsa Abdetedal  Zaher Hossein Shomali  Mohammad Reza Gheitanchi 《地震科学（英文版）》2015,28(4):235-251

Seismic ambient noise of surface wave tomography was applied to estimate Rayleigh wave empirical Green's functions(EGFs) and then to study crust and uppermost mantle structure beneath the Makran region in south-east Iran.12 months of continuous data from January 2009 through January 2010,recorded at broadband seismic stations,were analyzed.Group velocities of the fundamental mode Rayleigh wave dispersion curves were obtained from the empirical Green's functions.Multiplefilter analysis was used to plot group velocity variations at periods from 10 to 50 s.Using group velocity dispersion curves,1-D vs velocity models were calculated between several station pairs.The final results demonstrate significant agreement to known geological and tectonic features.Our tomography maps display low-velocity anomaly with SW-NE trend,comparable with volcanic arc settings of the Makran region which may be attributable to the geometry of Arabian Plate subducting beneath the overriding the Lut block.The northward subducting Arabian Plate is determined by high-velocity anomaly along the Straits of Hormuz.At short periods(20 s),there is a sharp transition boundary between low- and high-velocity transition zone with the NW trending at the western edge of Makran which is attributable to the Minab fault system.  相似文献   

An automated algorithm for river ice monitoring over the Susquehanna River using the MODIS data   总被引：1，自引：0，他引：1       下载免费PDF全文

Naira Chaouch  Marouane Temimi  Peter Romanov  Reggina Cabrera  George McKillop  Reza Khanbilvardi 《水文研究》2014,28(1):62-73

Reliable and prompt information on river ice condition and extent is needed to make accurate hydrological forecasts to predict ice jams breakups and issue timely flood warnings. This study presents a technique to detect and monitor river ice using observations from the MODIS instrument onboard the Terra satellite. The technique incorporates a threshold‐based decision tree image classification algorithm to process MODIS data and to determine the extent of ice. To differentiate between ice‐covered and ice‐free pixels within the riverbed, the algorithm combines observations in the visible and near‐infrared spectral bands. The developed technique presents the core of the MODIS‐based river ice mapping system, which has been developed to support National Oceanic and Atmospheric Administration NWS's operations. The system has been tested over the Susquehanna River in northeastern USA, where ice jam events leading to spring floods are a frequent occurrence. The automated algorithm generates three products: daily ice maps, weekly composite ice maps and running cloud‐free composite ice maps. The performance of the system was evaluated over nine winter seasons. The analysis of the derived products has revealed their good agreement with the aerial photography and with in situ observations‐based ice charts. The probability of ice detection determined from the comparison of the product with the high‐resolution Landsat imagery was equal to 91%. A consistent inverse relationship was found between the river discharge and the ice extent. The correlation between the discharge and the ice extent as determined from the weekly composite product reached 0.75. The developed CREST River Ice Observation System has been implemented at National Oceanic and Atmospheric Administration–Cooperative Remote Sensing Science and Technology Center as an operational Web tool allowing end users and forecasters to assess ice conditions on the river. Copyright © 2012 John Wiley & Sons, Ltd.  相似文献   

Shallow gas accumulations and seepage in the sediments of the Northeast Persian Gulf     

Gholamreza Hosseinyar  Reza Moussavi-Harami  Reza Behbahani 《Acta Geophysica》2014,62(6):1373-1386

Shallow gas accumulations and gas seepage may indicate deeper hydrocarbon reservoirs. Sonar and high resolution seismic recordings were carried out to obtain gas migration and accumulation below seabed in Northeast Persian Gulf. Results revealed some structures and reflectivity effects, for example few pockmarks, gas seepage, and other surface structures in sonar and seismic data. Most of the features observed on seismic data were located at depths between 5 and 10 m (sub-sea bed) that include acoustic blanking and turbidity, gas packets, gas chimneys, and enhanced reflection. Most of the gas is accumulated on young and thin parallel layers, but the presence of acoustic effect in Aghajari Formation indicates that the origin of the gas accumulation in shallow strata may be located in a deeper reservoir.  相似文献   

4‐Phenyl‐3‐thiosemicarbazide Modified Magnetic Nanoparticles: Synthesis,Characterization and Application for Heavy Metal Removal          下载免费PDF全文

Kiomars Zargoosh  Mohammad Reza Mohammadi  Hamed Abedini 《洁净——土壤、空气、水》2014,42(9):1208-1215

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Application of singular value decomposition (SVD) and semi-discrete decomposition (SDD) techniques in clustering of geochemical data: an environmental study in central Iran   总被引：1，自引：1，他引：0  

Hamid Zekri  Ahmad Reza Mokhtari  David R. Cohen 《Stochastic Environmental Research and Risk Assessment (SERRA)》2016,30(7):1947-1960

Common multivariate clustering techniques are ineffective in identifying subtle patterns of correlation, and clustering of variables or samples within complex geochemical datasets. This study compares the combination of singular value decomposition (SVD) and semi discrete decomposition (SDD), with that of hierarchical cluster analysis (HCA), to examine patterns within a multielement soil geochemical dataset from an agricultural area in the vicinity of Pb–Zn mining operations in central Iran. SVD was used to both identify patterns of correlation between variables and samples and to “denoise” the data, and SDD to simultaneously cluster the samples and variables. The results reveal various spatial associations of mining waste-associated metals As, Ba, Pb and Zn, and within the remaining elements whose distribution is largely controlled by the major oxides. SVD–SDD was found to be superior to HCA, in its ability to detect subtle clusters in soil geochemistry indicative of mine-related contamination in the study area.  相似文献