Application of Large‐Scale Inversion Algorithms to Hydraulic Tomography in an Alluvial Aquifer          下载免费PDF全文

P. Fischer  A. Jardani  A. Soueid Ahmed  M. Abbas  X. Wang  H. Jourde  N. Lecoq 《Ground water》2017,55(2):208-218

Large‐scale inversion methods have been recently developed and permitted now to considerably reduce the computation time and memory needed for inversions of models with a large amount of parameters and data. In this work, we have applied a deterministic geostatistical inversion algorithm to a hydraulic tomography investigation conducted in an experimental field site situated within an alluvial aquifer in Southern France. This application aims to achieve a 2‐D large‐scale modeling of the spatial transmissivity distribution of the site. The inversion algorithm uses a quasi‐Newton iterative process based on a Bayesian approach. We compared the results obtained by using three different methodologies for sensitivity analysis: an adjoint‐state method, a finite‐difference method, and a principal component geostatistical approach (PCGA). The PCGA is a large‐scale adapted method which was developed for inversions with a large number of parameters by using an approximation of the covariance matrix, and by avoiding the calculation of the full Jacobian sensitivity matrix. We reconstructed high‐resolution transmissivity fields (composed of up to 25,600 cells) which generated good correlations between the measured and computed hydraulic heads. In particular, we show that, by combining the PCGA inversion method and the hydraulic tomography method, we are able to substantially reduce the computation time of the inversions, while still producing high‐quality inversion results as those obtained from the other sensitivity analysis methodologies.  相似文献   

Effects of rotational components of earthquake on seismic response of arch concrete dams     

Moradloo  Amir Javad  Naiji  Abbas 《地震工程与工程振动(英文版)》2020,19(2):349-362

The present study deals with dynamic analysis of arch concrete dams, taking rotational components of earthquakes into account. A modified methodology was used to evaluate the rotational components of the earthquake. The translational components of the earthquake have been used in to obtain the rotational components of the earthquake, based on the intersecting isotropic elastic wave propagation. Two rotational components of Taft, Tabas and San-Fernando earthquakes are evaluated based on the translational components of the earthquakes and considering frequency dependencies of incident angle and wave velocity. Finally, dynamic analyses of Morrow Point Dam are presented to evaluate the effects of combined translational and rotational components on the seismic response of the dam. Various conditions of reservoirs, including full and empty state, are considered in the analyses. Fluid–structure interaction was completely taken into account. It was realized that incorporating rotational components increased the maximum compressive and tensile stresses in both empty and full reservoir analyses. Distribution of maximum tensile stresses is very sensitive to the rotational components of the earthquake. Also, it can be concluded that the segregated effect of the rocking component on the response of concrete dams is more effective than the sole effect of the torsional component.  相似文献   

Influence of Ultrasonic on the Flow Behavior and Disperse Phase of Cellulose Nano-particles at Fluid–Fluid Interface     

Agi  Augustine  Junin  Radzuan  Abbas  Azza  Gbadamosi  Afeez  Azli  Nur Bashirah 《Natural Resources Research》2020,29(2):1427-1446

Natural Resources Research - Nano-particles can localize at oil–water (O/W) interface, reduce residual oil saturation, increase the viscosity of brine and decrease the viscosity of crude oil...  相似文献   

Automatic analysis of positional plausibility for points of interest in OpenStreetMap using coexistence patterns     

Alireza Kashian  Abbas Rajabifard  Kai-Florian Richter  Yiqun Chen 《International journal of geographical information science》2019,33(7):1420-1443

In the past decade, Volunteered Geographic Information (VGI) has emerged as a new source of geographic information, making it a cheap and universal competitor to existing authoritative data sources. The growing popularity of VGI platforms, such as OpenStreetMap (OSM), would trigger malicious activities such as vandalism or spam. Similarly, wrong entries by unexperienced contributors adds to the complexities and directly impact the reliability of such databases. While there are some existing methods and tools for monitoring OSM data quality, there is still a lack of advanced mechanisms for automatic validation. This paper presents a new recommender tool which evaluates the positional plausibility of incoming POI registrations in OSM by generating near real-time validation scores. Similar to machine learning techniques, the tool discovers, stores and reapplies binary distance-based coexistence patterns between one specific POI and its surrounding objects. To clarify the idea, basic concepts about analysing coexistence patterns including design methodology and algorithms are covered in this context. Furthermore, the results of two case studies are presented to demonstrate the analytical power and reliability of the proposed technique. The encouraging results of this new recommendation tool elevates the need for developing reliable quality assurance systems in OSM and other VGI projects.  相似文献   

Risk-Based Analysis in Mineral Potential Mapping: Application of Quantifier-Guided Ordered Weighted Averaging Method     

Elyasi  Gholam-Reza  Bahroudi  Abbas  Abedi  Maysam 《Natural Resources Research》2019,28(3):931-951

Natural Resources Research - In this work, a quantifier-guided ordered weighted averaging (OWA) method was employed for mineral potential mapping (MPM) in Nowchun Cu–Mo prospect, SE Iran. The...  相似文献   

A New Non-stationary High-order Spatial Sequential Simulation Method     

Haji Abolhassani  Amir Abbas  Dimitrakopoulos  Roussos  Ferrie  Frank P.  Yao  Lingqing 《Mathematical Geosciences》2022,54(6):1097-1119

Mathematical Geosciences - A new non-stationary, high-order sequential simulation method is presented herein, aiming to accommodate complex curvilinear patterns when modelling non-Gaussian,...  相似文献   

Machine learning-based thermal anomalies detection from MODIS LST associated with the Mw 7.7 Awaran,Pakistan earthquake     

Hafeez  Amna  Ehsan  Muhsan  Abbas  Ayesha  Shah  Munawar  Shahzad  Rasim 《Natural Hazards》2022,111(2):2097-2115

Natural Hazards - Satellite based thermal anomaly occurs as a substantial precursor for strong earthquakes, as the need for earthquake precursor detection has very important for impending main...  相似文献   

A comparison between karst development in two main zones of Iran: case study—Keyno anticline (Zagros Range) and Shotori anticline (Central Iran)     

Manouchehr Chitsazan  Hossein Karimi Vardanjani  Haji Karimi  Abbas Charchi 《Arabian Journal of Geosciences》2015,8(12):10833-10844

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Determination of Longwall Mining-Induced Stress Using the Strain Energy Method   总被引：3，自引：0，他引：3  

Mohammad Rezaei  Mohammad Farouq Hossaini  Abbas Majdi 《Rock Mechanics and Rock Engineering》2015,48(6):2421-2433

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Displacement reducer fuses for improving seismic performance of caisson quay walls     

Amirali Mostafavi Moghadam  Abbas Ghalandarzadeh  Majid Moradi  Ikuo Towhata  Pouria Hajialikhani 《Bulletin of Earthquake Engineering》2011,9(4):1259-1288

This research is to study the efficiency of displacement reducer fuses, installed behind the caisson quay walls for controlling the dynamic backfill thrust and minimizing the displacement, settlement and tilting of the walls. For this purpose, two types of fuses, Displacement Reducer Panels (DRP) and Displacement Reducer Elements (DRE), were constructed and installed behind the wall. The DRPs were constructed by hollow Polypropylene sheets to reproduce elastoplastic and plastic mechanical behaviors. The DREs were cylindrical stainless-steel dampers, working upon friction mechanism that can reproduce perfect plastic behavior. Here, two series of shaking table 1-g tests were performed with DRP and DRE applications. In this regard, different mechanical behaviors and capacities were considered for fuses against demand thrusts of backfill in order to compare the mitigation tests with no-mitigation cases. Harmonic base motions with constant amplitude and constant frequency were used in the model test. The foundation soil and the backfill soil were constructed with the relative densities of 85 and 25%, respectively, to reproduce non-liquefiable base layer and loose backfill situations in the model, respectively. The results showed remarkable reduction in kinetic energy, dynamic backfill thrust and consequently seaward movement, settlement and inclination of the caisson quay wall in case of using fuses with plastic behaviors behind the wall.  相似文献