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Assessing morphological changes in a human-impacted alluvial system using hydro-sediment modeling and remote sensing

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International Journal of Sediment Research 2021年第3期36卷 439-448页

作者： Mohammad Reza Shojaeian Zahra Karimidastenaei omid rahmati Ali Torabi Haghighi Water Energy and Environmental Engineering Research Unit University of Oulu Soil Conservation and Watershed Management Research Department Kurdistan Agricultural and Natural Resources Research and Education CenterAREEO Sanandaj 661693 6311 Iran Mohammad Reza Shojaeiana Zahra Karimidastenaeia * Omid RahmatibAli Torabi Haghighia aWater Energy and Environmental Engineering Research Unit University of Oulu P.O.Box 4300 FIN-90014 Oulu Finland bSoil Conservation and Watershed Management Research Department Kurdistan Agricultural and Natural Resources Research and Education CenterAREEO

Construction of managed aquifer recharge structures(MARS) to store floodwater is a common strategy for storing depleted groundwater resources in arid and semi-arid regions, as part of integrated water resources management(IWRM). MARS divert surface water to groundwater, but this can affect downstream fluvial processes. The impact of MARS on fluvial processes was investigated in this study by combining remote sensing techniques with hydro-sediment modeling for the case of the Kaboutar-AliChay aquifer, northwestern Iran. The impact of MARS on groundwater dynamics was assessed, sedimentation across the MARS was modeled using a 2 D hydrodynamic model, and morphological changes were quantified in the human-impacted alluvial fan using Landsat time series data and statistical methods. Changes were detected by comparing data for the periods before(1985 e1996) and after(1997 e2018) MARS construction. The results showed that the rate of groundwater depletion decreased from2.14 m/yr before to 0.86 m/yr after MARS construction. Hydro-sediment modeling revealed that MARS ponds slowed water outflow, resulting in a severe decrease in sediment load which lead to a change from sediment deposition to sediment erosion in the alluvial fan. Morphometric analyses revealed decreasing alluvial fan area and indicated significant differences(p < 0.01) between pre-and post-impact periods for different morphometric parameters analyzed. The rate of change in area of the Kaboutar-Ali-Chay alluvial fan changed from à0.228 to à0.115 km2/year between pre-and post-impact periods.

关键词： Groundwater recharge MARS CCHE2D Landsat Statistical analysis Alluvial fan

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Deep learning neural networks for spatially explicit prediction of flash flood probability

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Geoscience Frontiers 2021年第3期12卷 370-383页

作者： Mahdi Panahi Abolfazl Jaafari Ataollah Shirzadi Himan Shahabi omid rahmati Ebrahim omidvar Saro Lee Dieu Tien Bui Geoscience Platform Research Division Korea Institute of Geoscience and Mineral Resources(KIGAM)124Gwahak-ro Yuseong-guDaejeon 34132Republic of Korea Division of Science Education Kangwon National UniversityChuncheon-siGangwon-do 24341Republic of Korea Research Institute of Forests and Rangelands Agricultural ResearchEducationand Extension Organization(AREEO)Tehran 13185-116Iran Department of Rangeland and Watershed Management Faculty of Natural ResourcesUniversity of KurdistanSanandaj 66177-15175Iran Department of Geomorphology Faculty of Natural ResourcesUniversity of KurdistanSanandajIran Kordestan Agricultural and Natural Resources Research and Education Center Agricultural ResearchEducationand Extension Organization(AREEO)SanandajIran Department of Rangeland and Watershed Management Faculty of Natural Resources and Earth SciencesUniversity of KashanKashan 87317-53153Iran Department of Geophysical Exploration Korea University of Science and Technology217 Gajeong-roYuseong-guDaejeon 34113Republic of Korea Institute of Research and Development Duy Tan UniversityDa Nang 550000Viet Nam Department of Zrebar Lake Environmental Research Kurdistan Studies InstituteUniversity of KurdistanSanandajIran

Flood probability maps are essential for a range of applications,including land use planning and developing mitigation strategies and early warning *** study describes the potential application of two architectures of deep learning neural networks,namely convolutional neural networks(CNN)and recurrent neural networks(RNN),for spatially explicit prediction and mapping of flash flood *** develop and validate the predictive models,a geospatial database that contained records for the historical flood events and geo-environmental characteristics of the Golestan Province in northern Iran was *** step-wise weight assessment ratio analysis(SWARA)was employed to investigate the spatial interplay between floods and different influencing *** CNN and RNN models were trained using the SWARA weights and validated using the receiver operating characteristics *** results showed that the CNN model(AUC=0.832,RMSE=0.144)performed slightly better than the RNN model(AUC=0.814,RMSE=0.181)in predicting future ***,these models demonstrated an improved prediction of floods compared to previous studies that used different models in the same study *** study showed that the spatially explicit deep learning neural network models are successful in capturing the heterogeneity of spatial patterns of flood probability in the Golestan Province,and the resulting probability maps can be used for the development of mitigation plans in response to the future *** general policy implication of our study suggests that design,implementation,and verification of flood early warning systems should be directed to approximately 40%of the land area characterized by high and very susceptibility to flooding.

关键词： Spatial modeling Machine learning Convolutional neural networks Recurrent neural networks GIS Iran

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SWPT:An automated GIS-based tool for prioritization of sub-watersheds based on morphometric and topo-hydrological factors

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Geoscience Frontiers 2019年第6期10卷 2167-2175页

作者： omid rahmati Mahmood Samadi Himan Shahabi Ali Azareh Elham Rafiei-Sardooi Hossein Alilou Assefa M.Melesse Biswajeet Pradhan Kamran Chapi Ataollah Shirzadi Geographic Information Science Research Group Ton Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Environment and Labour Safety Ton Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Natural Resources University of TehranKarajIran Department of Geomorphology Faculty of Natural ResourcesUniversity of KurdistanSanandajIran Department of Geography University of JiroftKermanIran Faculty of Natural Resources University of JiroftKermanIran Aquatic Ecodynamics UWA School of Agriculture and EnvironmentThe University of Western AustraliaCrawleyWA6009Australia Department of Earth and Environment AHC 5-390Florida International UniversityUSA Centre for Advanced Modelling and Geospatial Information Systems(CAMGIS) Faculty of Engineering and ITUniversity of Technology SydneyNSW2007Australia Department of Energy and Mineral Resources Engineering Choongmu-gwanSejong University209 Neungdong-roGwangjin-guSeoul05006Republic of Korea Department of Rangeland and Watershed Management Faculty of Natural ResourcesUniversity of KurdistanSanandajIran

The sub-watershed prioritization is the ranking of different areas of a river basin according to their need to proper planning and management of soil and water *** makers should optimally allocate the investments to critical sub-watersheds in an economically effective and technically efficient ***,this study aimed at developing a user-friendly geographic information system(GIS)tool,Sub-Watershed Prioritization Tool(SWPT),using the Python programming language to decrease any possible *** used geospatial-statistical techniques for analyzing morphometric and topohydrological factors and automatically identifying critical and priority *** order to assess the capability and reliability of the SWPT tool,it was successfully applied in a watershed in the Golestan Province,Northern *** records of flood and landslide events indicated that the SWPT correctly recognized critical *** provided a cost-effective approach for prioritization of ***,the SWPT is practically applicable and replicable to other regions where gauge data is not available for each sub-watershed.

关键词： SWPT Watershed prioritization GIS Effective management

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A rapid and efficient method for the synthesis of 14H-dibenzo[α.j]xanthenes,aryl-5H-dibenzo[b.i]xanthene-5,7,12,14-(13H)-tetraone and 1,8-dioxooctahydroxanthenes by acidic ionic liquid

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Chinese Chemical Letters 2010年第7期21卷 761-764页

作者： Abbas rahmati Department of Chemistry University of IsfahanP.O.Box 81746-7344IsfahanIran

Various xanthenes have been synthesized by the condensation ofβ-naphthol,2-hydroxynaphthalene-1,4-dione or dimedone with various aldehydes in the presence of trifluoroacetic acid as catalyst in 1,1,3,3-N,N,N′,N′-te... 详细信息

关键词： Ionic liquid 14H-Dibenzo[α.j]xanthenes β-Naphthol 2-Hydroxynaphthalene-1 4-dione Dimedone

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On intervals and sets of hypermatrices(tensors)

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Frontiers of Mathematics in China 2020年第6期15卷 1175-1188页

作者： Saeed rahmati Mohamed A.TAWHID Department of Mathematics and Statistics Faculty of ScienceThompson Rivers UniversityKamloopsBC V2C 0C8Canada

Interval hypermatrices(tensors)ape introduced and interval α-hypermatrices are uniformly characterized using a finite set of'extreme'hypermatrices,where α can be strong P,semi-positive,or positive definite,among many *** is shown that a symmetric interval is an interval(strictly)copositive-hypermatrix if and only if it is an interval(E)*** is also shown that an even-order,symmetric interval is an interval positive(semi-)definite-hypermatrix if and only if it is an interval P(P_(0))-*** hypermnatrices are generalized to sets of hyper-matrices,several slice-properties of a set of hypermatrices are introduced and sets of hypermatrices with various slice-properties are uniformly *** a consequence,several slice-properties of a compact,convex set of hyper-matrices are characterized by its extreme points.

关键词： Tensor hypermatrix interval hypermatrix hypermatrix set slice-P-property

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Squeezing rock conditions at phyllite-slate zone in Golab water conveyance tunnel,Iran:A case study

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Journal of Central South University 2017年第10期24卷 2475-2485页

作者： rahmati Asghar Faramarzi Lohrasb Darbor Mohammad Department of Mining Engineering Isfahan University of TechnologyIsfahan84156-83111Iran

Squeezing ground in tunneling is associated with large deformation of the tunnel face. In this study, squeezing characteristics of the ground and rock conditions in Golab water conveyance tunnel, Iran, are discussed and the classification of squeezing behavior around zones where the problems occurred is presented. The squeezing conditions were investigated using empirical and semi empirical methods. In the next step, creep convergence of the tunnel with Burger's model was simulated by the numerical method. Numerical analysis showed that wall displacement(64.1 mm) of the Golab tunnel was more than allowable strain(1% of the tunnel diameter), therefore, it was found that squeezing phenomenon could exist, leading to the failure of the support system. Numerical analysis at the phyllite-slate zone also showed squeezing conditions due to the weakness of rock mass and high overburden that this situation cause failure in the segmental lining. In this research, failure in segmental lining in phyllite-slate zone verified the results of the numerical modeling.

关键词： squeezing large deformation Burger’s model numerical analysis failure segmental lining

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On Non-standard Hilbert Functions

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Algebra Colloquium 2018年第1期25卷 71-80页

作者： Amir Bagheri Rahim rahmati-Asghar Marand Technical Coflege University of Tabriz Tabriz Iran School of Mathematics Institute for Research in Fundamental Sciences (IPM) Department of Mathematics Faculty of Basic Sciences University of Maragheh

. Let S = k[x1,..., xn] be a non-standard polynomial ring over a field k and let M be a finitely generated graded S-module. In this paper, we investigate the behaviour of Hilbert function of M and its relations with lattice point counting. More precisely, by using combinatorial tools, we prove that there exists a polytope such that the image of Hilbert function in some degree is equal to the number of lattice points of this polytope.

关键词： polynomial ring non-standard Hilbert function Hermite normal form

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Catalyst free synthesis of fused pyrido[2,3-d]pyrimidines and pyrazolo[3,4-b]pyridines in water

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Chinese Chemical Letters 2012年第10期23卷 1149-1152页

作者： Abbas rahmati Zahra Khalesi Department of Chemistry University of IsfahanP.O.Box 8174673441 IsfahanIran

A one-pot, three-component condensation reaction of an aldehyde, benzoyl acetonitrile （3-oxo-3-phenylpropane nitrile） and 6- amino-1,3-dimethylpyrimidine-2,4（1H,3H）-dione or 3-methyl-l-phenyl-lH-pyrazol-5-amine in water to give fused pyrido[2,3- d]pyrimidines and pyrazolo[3,4-b]pyridines in high yields without any catalyst, is described.

关键词： Aminopyrazole Aqueous media 3-Methyl-l-phenyl-lH-pyrazol-5-amine Pyrazolo[3,4-b]pyridine

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Microwave-induced Stereoselectivity in Synthesis of trans-4-Aryl-3-methyl-6-oxo-4,5,6,7-tetrahydro-2H- pyrazolo[3,4-b]pyridine-5-carbonitriles

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Chinese Journal of Chemistry 2011年第11期29卷 2373-2378页

作者： rahmati, Abbas Alizadeh Kouzehrash, Meysam Department of Chemistry University of lsfahan P. O. Box 81746-7344 Isfahan Iran

A facile synthesis of trans isomers of 4-aryl-3-methyl-6-oxo-4,5,6,7-tetrahydro-2H-pyrazolo[3,4-b]pyridine-5- carbonitriles via three-component condensation reaction of an aldehyde, 3-amino-5-methylpyrazole and ethyl cyanoacetate in acetonitrile has been developed under microwave irradiation. This one-pot reaction proceeds with-out any catalyst in short times and gives the product in high selectivities and high yields.

关键词： multi-component condensation reactions microwave pyrazolo[3,4-b]pyridine 3-amino-5- methylpyrazole

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Revisiting the space-time gradient method:A time-clocking perspective, high order difference time discretization and comparison with the harmonic balance method

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Chinese Journal of Aeronautics 2022年第11期35卷 45-58页

作者： Boqian WANG Dingxi WANG Mohammad rahmati Xiuquan HUANG School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China Department of Mechanical and Construction Engineering Northumbria UniversityNewcastle upon Tyne NEI 8STUnited Kingdom

This paper revisits the Space-Time Gradient(STG) method which was developed for efficient analysis of unsteady flows due to rotor–stator interaction and presents the method from an alternative time-clocking perspective. The STG method requires reordering of blade passages according to their relative clocking positions with respect to blades of an adjacent blade row. As the space-clocking is linked to an equivalent time-clocking, the passage reordering can be performed according to the alternative time-clocking. With the time-clocking perspective, unsteady flow solutions from different passages of the same blade row are mapped to flow solutions of the same passage at different time instants or phase angles. Accordingly, the time derivative of the unsteady flow equation is discretized in time directly, which is more natural than transforming the time derivative to a spatial one as with the original STG method. To improve the solution accuracy, a ninth order difference scheme has been investigated for discretizing the time derivative. To achieve a stable solution for the high order scheme, the implicit solution method of Lower-Upper Symmetric GaussSeidel/Gauss-Seidel(LU-SGS/GS) has been employed. The NASA Stage 35 and its blade-countreduced variant are used to demonstrate the validity of the time-clocking based passage reordering and the advantages of the high order difference scheme for the STG method. Results from an existing harmonic balance flow solver are also provided to contrast the two methods in terms of solution stability and computational cost.

关键词： Harmonic balance method High order difference scheme Passage reordering Space-time gradient method Unsteady flows

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