An iteratively reweighted least-squares approach to adaptive robust adjustment of parameters in linear regression models with autoregressive and <Emphasis Type="Italic">t</Emphasis>-distributed deviations     

Boris Kargoll  Mohammad Omidalizarandi  Ina Loth  Jens-André Paffenholz  Hamza Alkhatib 《Journal of Geodesy》2018,92(3):271-297

In this paper, we investigate a linear regression time series model of possibly outlier-afflicted observations and autocorrelated random deviations. This colored noise is represented by a covariance-stationary autoregressive (AR) process, in which the independent error components follow a scaled (Student’s) t-distribution. This error model allows for the stochastic modeling of multiple outliers and for an adaptive robust maximum likelihood (ML) estimation of the unknown regression and AR coefficients, the scale parameter, and the degree of freedom of the t-distribution. This approach is meant to be an extension of known estimators, which tend to focus only on the regression model, or on the AR error model, or on normally distributed errors. For the purpose of ML estimation, we derive an expectation conditional maximization either algorithm, which leads to an easy-to-implement version of iteratively reweighted least squares. The estimation performance of the algorithm is evaluated via Monte Carlo simulations for a Fourier as well as a spline model in connection with AR colored noise models of different orders and with three different sampling distributions generating the white noise components. We apply the algorithm to a vibration dataset recorded by a high-accuracy, single-axis accelerometer, focusing on the evaluation of the estimated AR colored noise model.  相似文献   

A new empirical equation for predicting the maximum initial amplitude of submarine landslide-generated waves     

Sabeti  Ramtin  Heidarzadeh  Mohammad 《Landslides》2022,19(2):491-503

Landslides - The accurate prediction of landslide tsunami amplitudes has been a challenging task given large uncertainties associated with landslide parameters and often the lack of enough...  相似文献   

Uncertainty quantification of landslide runout motion considering soil interdependent anisotropy and fabric orientation     

Ma  Guotao  Rezania  Mohammad  Mousavi Nezhad  Mohaddeseh  Hu  Xiewen 《Landslides》2022,19(5):1231-1247

Landslides - Natural soils often exhibit an anisotropic fabric pattern as a result of soil deposition, weathering, or filling. This paper aims to investigate the effect of soil interdependent...  相似文献   

A probabilistic framework to make a decision on the post-earthquake functionality of bridges considering the damage,residual displacement,and aftershock     

Akbari  Sepideh  Khanmohammadi  Mohammad 《Bulletin of Earthquake Engineering》2022,20(2):1193-1218

Bulletin of Earthquake Engineering - Making a decision on the post-earthquake functionality of structures has always been one of the most challenging issues in earthquake engineering. There is an...  相似文献   

The impact of land use and land cover changes on soil erosion in western Iran   总被引：1，自引：0，他引：1  

Eskandari Damaneh  Hadi  Khosravi  Hassan  Habashi  Khalil  Eskandari Damaneh  Hamed  Tiefenbacher  John P. 《Natural Hazards》2022,110(3):2185-2205

Natural Hazards - Analysis of long-term land use and land cover (LULC) changes requires up-to-date remotely sensed data to assess their effects on erosion. This is a particularly important...  相似文献   

Reliability framework for characterizing heat wave and cold spell events     

Moghim  Sanaz  Jahangir  Mohammad Sina 《Natural Hazards》2022,112(2):1503-1525

Natural Hazards - Extreme weather events such as heat waves and cold spells affect people’s lives. This study develops a probabilistic framework to evaluate heat waves and cold spells. As...  相似文献   

Prediction of Rock Abrasivity Index (RAI) and Uniaxial Compressive Strength (UCS) of Granite Building Stones Using Nondestructive Tests     

Farhadian  Ali  Ghasemi  Ebrahim  Hoseinie  Seyed Hadi  Bagherpour  Raheb 《Geotechnical and Geological Engineering》2022,40(6):3343-3356

Geotechnical and Geological Engineering - Rock abrasivity index (RAI) and uniaxial compressive strength (UCS) are two key parameters for assessing abrasivity and durability of building stones,...  相似文献   

Determination and Assessment of Parameters Influencing Rock Mass Cavability in Block Caving Mines Using the Probabilistic Rock Engineering System   总被引：1，自引：0，他引：1  

Ramin Rafiee  Mohammad Ataei  Reza Khalokakaie  Seyed Mohammad Esmaeil Jalali  Farhang Sereshki 《Rock Mechanics and Rock Engineering》2015,48(3):1207-1220

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Development of a synthetically generated earthquake catalogue towards assessment of probabilistic seismic hazard for Tehran   总被引：1，自引：0，他引：1  

Mohammad R. Zolfaghari 《Natural Hazards》2015,76(1):497-514

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Geostatistics as a groundwater exploration planning tool: case of a brackish-saline aquifer     

Mohammad?H.?MakkawiEmail author 《Arabian Journal of Geosciences》2015,8(5):3311-3319

This paper discusses a geostatistical approach to model a groundwater aquifer in 3-D. The study aims at utilizing geostatistics as a tool for characterizing zones of better-water quality in a brackish-saline aquifer. In particular, the geostatistical model was constructed to characterize the aquifer’s salinity, represented by total dissolved solids (TDS), using logs of porosity and resistivity. Quality-checked estimated TDS vertical profiles were employed to construct and model horizontal and vertical semivariograms. Parameters of semivariogram models were used to develop both the kriging plan and the generated model. Results of this modeling process are shown in the form of horizontal salinity distribution maps. The aquifer was sliced into 20 layers, each 20 m thick, to represent its overall thickness. Salinity layers maps reflect vertical stratification of TDS concentrations in the aquifer and show that water quality deteriorates with depth and toward the northern part of the aquifer. Relatively better-quality water (TDS ≤10,000 mg/l) can be found at depths between 100 and 250 m below the aquifer’s top in both eastern and southeastern parts. Water in the same interval to the western and southwestern parts reflects the presence of higher TDS concentration. From a planning point of view, it is more feasible to target the eastern part of the aquifer for pumping and desalination purposes. In addition, the generated model could be utilized as an initial condition for flow simulation.  相似文献