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11.
Ahmad Nicknam Reza Abbasnia Yasser Eslamian Mohsen Bozorgnasab Ehsan Adeli Mosabbeb 《Journal of Earth System Science》2010,119(3):383-396
We determine the source parameters for 2003 (Mw 6.5) Bam, Iran, earthquake using an empirical Green’s function summation approach
to model ground motions recorded by two strong motion stations at approximately 45 km epicentral distance. We introduce a
genetic algorithm technique to optimize the fit to observed elastic response spectra. The proposed genetic algorithm technique
allows us to explore the sensitivity of the results to multiple source parameters, including hypocenter location, focal mechanism
(Strike and Dip), P-wave velocity in depth, fault dimension and rupture and healing velocities. 相似文献
12.
Earth dam site selection is one of the most important problems in water resources management. It depends on a set of qualitative and quantitative criteria, and they may even be in conflict with each other. This study aims to develop a multicriteria decision-making approach to locate the dam site and construct a multipurpose earth dam in Harsin City at the western part of Iran. For this purpose, firstly, the influential criteria for locating the earth dam site were determined using a comprehensive literature review and the experts’ opinions. Then, some watersheds in the surrounding areas of Iran’s Harsin City were studied and four feasible sites proposed. In the final stage, these sites, in order to construct a multipurpose earth dam, were prioritized using the analytic hierarchy process approach and the most optimal site was selected. 相似文献
13.
Javed Mallick Yasser Alashker Shams Al-Deen Mohammad Mohd Ahmed Mohd Abul Hasan 《国际地球制图》2013,28(8):915-940
Soil erosion is the most important factor in land degradation and influences desertification in semi-arid areas. A comprehensive methodology that integrates revised universal soil loss equation (RUSLE) model and GIS was adopted to determine the soil erosion risk (SER) in semi-arid Aseer region, Saudi Arabia. Geoenvironmental factors viz. rainfall (R), soil erodibility (K), slope (LS), cover management and practice factors were computed to determine their effects on average annual soil loss. The high potential soil erosion, resulting from high denuded slope, devoid of vegetation cover and high intensity rainfall, is located towards the north western part of the study area. The analysis is investigated that the SER over the vegetation cover including dense vegetation, sparse vegetation and bushes increases with the higher altitude and higher slope angle. The erosion maps generated with RUSLE integrated with GIS can serve as effective inputs in deriving strategies for land planning/management in the environmentally sensitive mountainous areas. 相似文献
14.
A study is presented of the influence of stiffness and strength eccentricities on the inelastic torsional response of buildings under the action of two simultaneous orthogonal horizontal ground motion components. Asymmetric buildings were obtained from their respective symmetric systems and were characterized by their stiffness and strength torsional eccentricities in both orthogonal directions. Based on the results of inelastic response of both building types (symmetric and asymmetric), the seismic reliability functions are determined for each system, and their forms of variation with different global system parameters are evaluated. Illustrative examples are presented about the use of this information for the formulation of seismic design criteria for in‐plan asymmetric multistory systems, in order to attain the same reliability levels implicit for symmetric systems designed in accordance with current seismic design codes. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
15.
Giloy Nathalie Hamdi Yasser Bardet Lise Garnier Emmanuel Duluc Claire-Maire 《Natural Hazards》2019,98(3):869-893
Natural Hazards - As instrumental records often cover only short time periods, historical information is the main source of data in order to extend natural disaster catalogs. This study... 相似文献
16.
Yasser SALAMA Michael GRAMMER Shaban SABER Soheir EL-SHAZLY Gouda ABDEL-GAWAD 《《地质学报》英文版》2018,92(1):286-310
The Lower Cretaceous sections in northern Sinai are composed of the Risan Aneiza (upper
Barremian-middle Albian) and the Halal (middle Albian-lower Cenomanian) formations. The facies
reflect subtle paleobathymetry from inner to outer ramp facies. The inner ramp facies are peritidal,
protected to open marine lagoons, shoals and rudist biostrome facies. The inner ramp facies grade
northward into outer ramp deposits. The upper Barremian-lower Cenomanian succession is subdivided
into nine depositional sequences correlated with those recognized in the neighbouring Tethyan areas.
These sequences are subdivided into 19 medium-scale sequences based on the facies evolution, the
recorded hardgrounds and flooding surfaces, interpreted as the result of eustatic sea level changes and
local tectonic activities of the early Syrian Arc rifting stage. Each sequence contains a lower
retrogradational parasequence set that constituted the transgressive systems tracts and an upper
progradational parasequence set that formed the highstand systems tracts. Nine rudist levels are
recorded in the upper Barremian through lower Cenomanian succession at Gabal Raghawi. At Gabal
Yelleg two rudist levels are found in the Albian. The rudist levels are associated with the highstand
systems tract deposits because of the suitability of the trophic conditions in the rudist-dominated ramp. 相似文献
17.
Guifu ZHANG Vivek N.MAHALE Bryan J.PUTNAM Youcun QI Qing CAO ANDrew D.BYRD Petar BUKOVCIC Dusan S.ZRNIC Jidong GAO Ming XUE Youngsun JUNG Heather D.REEVES Pamela L.HEINSELMAN AlexANDer RYZHKOV Robert D.PALMER Pengfei ZHANG Mark WEBER Greg M.MCFARQUHAR Berrien MOORE III Yan ZHANG Jian ZHANG J.VIVEKANANDAN Yasser AL-RASHID Richard L.ICE Daniel S.BERKOWITZ Chong-chi TONG Caleb FULTON Richard J.DOVIAK 《大气科学进展》2019,36(6):571-588
After decades of research and development, the WSR-88 D(NEXRAD) network in the United States was upgraded with dual-polarization capability, providing polarimetric radar data(PRD) that have the potential to improve weather observations,quantification, forecasting, and warnings. The weather radar networks in China and other countries are also being upgraded with dual-polarization capability. Now, with radar polarimetry technology having matured, and PRD available both nationally and globally, it is important to understand the current status and future challenges and opportunities. The potential impact of PRD has been limited by their oftentimes subjective and empirical use. More importantly, the community has not begun to regularly derive from PRD the state parameters, such as water mixing ratios and number concentrations, used in numerical weather prediction(NWP) models.In this review, we summarize the current status of weather radar polarimetry, discuss the issues and limitations of PRD usage, and explore potential approaches to more efficiently use PRD for quantitative precipitation estimation and forecasting based on statistical retrieval with physical constraints where prior information is used and observation error is included. This approach aligns the observation-based retrievals favored by the radar meteorology community with the model-based analysis of the NWP community. We also examine the challenges and opportunities of polarimetric phased array radar research and development for future weather observation. 相似文献
18.
Veterinary antibiotics contamination in water, sediment, and soil near a swine manure composting facility 总被引：5，自引：0，他引：5
Yasser M. Awad Sung-Chul Kim Samy A. M. Abd El-Azeem Kye-Hoon Kim Kwon-Rae Kim Kangjoo Kim Choong Jeon Sang Soo Lee Yong Sik Ok 《Environmental Earth Sciences》2014,71(3):1433-1440
Antibiotics have been commonly used to prevent animal diseases and promote livestock productivity. However, its release into the surrounding environments leads to ecological disturbance and risks to human health. This study was conducted to monitor the occurrence and seasonal variations of antibiotics in water, sediment, and soil close to a swine manure composting facility, Korea. Various types of antibiotics such as tetracyclines (TCs) including tetracycline, chlortetracycline, and oxytetracycline, and sulfonamides (SAs) including sulfamethazine, sulfamethoxazole, and sulfathiazole were measured by the high-performance liquid chromatography-tandem mass spectrometry via a solid-phase extraction. In the results it was identified that the variations of measured antibiotics’ concentrations in water, sediment, and soil are depending on the season. The observed concentration levels of TCs were higher in winter than in summer season, indicating that the low temperature is a parameter attributing to interruption of its degradation in water, sediment, and soil. The concentration levels of SAs were significantly higher than those of TCs and in general, all measured antibiotics’ concentrations were also in general higher in Korea when compared to those in other countries. The long-term monitoring of antibiotics’ residues in aquatic and terrestrial environments is necessary. 相似文献
19.
Sultan Yasser M. El-Shafei Mohamed K. Arnous Mohamed O. 《International Journal of Earth Sciences》2017,106(8):2817-2836
International Journal of Earth Sciences - A low-to medium-grade metamorphic belt of a volcano-sedimentary succession occurs in the eastern side of South Sinai as a part of the northernmost... 相似文献