Comparison of rockfall susceptibility assessment at local and regional scale: a case study in the north of Beijing (China)     

Xueliang Wang  Luqing Zhang  Jixin Ding  Qingfeng Meng  Javed Iqbal  Lihui Li  Zhifa Yang 《Environmental Earth Sciences》2014,72(11):4639-4652

This study shows a rockfall susceptibility assessment at local scale in north Beijing of China, including the identification of rockfall sources onsite by terrain and rock discontinuities analysis and run-out distance prediction by Rocfall^? simulation. Two types of rockfall were defined including one type on the cliffs with long inclined slopes and another type on the road slopes with low height. Two historical rockfall events were used to back-calibrating the parameters used for run-out distance simulation. Based on the work, rockfall susceptibility map at local scale was created in GIS, which was compared with the map obtained at regional scale (entire Huairou district scale). Due to the difference of approaches applied, procedure of assessment and types of source data acquired, the two resulting rockfall susceptibility maps are proved to be different. Still, both of them are useful and could be used at different level’s decision for rockfall prevention and mitigation. Different types of uncertainties exist in the study of rockfall susceptibility assessment. To reduce the uncertainties, studies on both approaches and techniques are suggested.  相似文献   

Assessing the long-term planform dynamics of Ganges–Jamuna confluence with the aid of remote sensing and GIS     

Khan  Nafis Sadik  Roy  Sujit Kumar  Mazumder  Md. Touhidur Rahman  Talukdar  Swapan  Mallick  Javed 《Natural Hazards》2022,114(1):883-906

Natural Hazards - The confluence of the Ganges, Jamuna, and Padma rivers is one of the most dynamic in the world, an internationally important research area because of the confluence of two of the...  相似文献   

Assessing the effect of future landslide on ecosystem services in Aqabat Al-Sulbat region,Saudi Arabia     

Alqadhi  Saeed  Mallick  Javed  Talukdar  Swapan  Ahmed  Mohd.  Khan  Roohul Abad  Sarkar  Showmitra Kumar  Rahman  Atiqur 《Natural Hazards》2022,111(1):641-660

Natural Hazards - Co-occurrence events of droughts and heatwaves characterized by abnormal low soil moisture (SM) and high temperatures may cause more significant impacts on society and natural...  相似文献   

Riverine flood assessment in Jhang district in connection with ENSO and summer monsoon rainfall over Upper Indus Basin for 2010     

Bushra Khalid  Débora Souza Alvim  Shumaila Javeed  Junaid Aziz Khan  Muhammad Asif Javed  Azmat Hayat Khan 《Natural Hazards》2018,92(2):971-993

Pakistan has experienced severe floods over the past decades due to climate variability. Among all the floods, the flood of 2010 was the worst in history. This study focuses on the assessment of (1) riverine flooding in the district Jhang (where Jhelum and Chenab rivers join, and the district was severely flood affected) and (2) south Asiatic summer monsoon rainfall patterns and anomalies considering the case of 2010 flood in Pakistan. The land use/cover change has been analyzed by using Landsat TM 30 m resolution satellite imageries for supervised classification, and three instances have been compared, i.e., pre-flooding, flooding, and post-flooding. The water flow accumulation, drainage density and pattern, and river catchment areas have been calculated by using Shutter Radar Topography Mission digital elevation model 90 m resolution. The standard deviation of south Asiatic summer monsoon rainfall patterns, anomalies and normal (1979–2008) has been calculated for July, August, and September by using rainfall data set of Era interim (0.75° × 0.75° resolution). El Niño Southern Oscillation has also been considered for its role in prevailing rainfall anomalies during the year 2010 over Upper Indus Basin region. Results show the considerable changing of land cover during the three instances in the Jhang district and water content in the rivers. Abnormal rainfall patterns over Upper Indus Basin region prevailed during summer monsoon months in the year 2010 and 2011. The El Niño (2009–2010) and its rapid phase transition to La Niña (2011–2012) may be the cause of severity and disturbances in rainfall patterns during the year 2010. The Geographical Information System techniques and model based simulated climate data sets have been used in this study which can be helpful in developing a monitoring tool for flood management.  相似文献   

Seismicity assessment of Fukushima region,fault kinematics and calculation of PGA value for Idosawa fault in Hamadori area,Japan     

Ahmed  Naseer  Ghazi  Shahid  Sami  Javed 《Natural Hazards》2018,92(2):1065-1079

Natural Hazards - In depth assessment of seismicity distribution for a particular region like Fukushima, prefecture is key towards reliable seismic hazard analysis for the area. Assessment of...  相似文献   

Qualitative Analysis of Old and New Sea Level Measuring Techniques and Their Data Consistency     

Vilibic  I. Dadic  V. Ivankovic  D. Beg Paklar  G. Cupic  S. 《Oceanic Engineering, IEEE Journal of》2007,32(2):428-435

This paper encompasses the analyses of sea level data measured at four tide gauges situated in the city of Split, Croatia. Two old long-term stations comprise float-type instruments in stilling wells, with analog recording on a chart, while two modern stations were installed in 1999 and 2000, calculating sea level height from the measured sea and air pressure. Although analog recording devices with a drum may suffer from inaccuracy in timing and drum rotation speed, clock errors, and vertical pencil position, the largest errors in the data came from the digitizing process, which is subjected to the individual work of a technician. Although, the data collected with pressure systems are supposed to be more homogeneous and accurate, after several years of work, the sensors usually have a drift in time. This problem turned out to be accompanied with lower quality sensors being part of wider automatic measuring systems, whereas the station which has been specially designed for sea level measurements showed no drifts in four years of operating. Therefore, one should be careful in choosing measuring equipment between various manufacturers. In addition, the equipment should be regularly checked since the malfunction in global positioning system (GPS) clock resulted in time drift of sea level data of more than an hour.  相似文献   

Assessment of several flood estimation methodologies in Makkah metropolitan area, Saudi Arabia   总被引：1，自引：1，他引：0  

Gomaa M. Dawod  Meraj N. Mirza  Khalid A. Al-Ghamdi 《Arabian Journal of Geosciences》2013,6(4):985-993

Estimation of floods in a hydrological basin is essential for efficient flood management and development planning. Several approaches have been proposed to estimate flood peak discharge based on topographic and morphometric characteristics of ungauged hydrological basins. Two global approaches, namely the rational and the curve number methods, along with four national regression models have been compared over Makkah metropolitan area, Saudi Arabia. The curve number methodology has been taken as the basis of comparison due to its precision and wide utilization. Results show that the rational method produces differences equal to 44% in terms of peak discharges. Moreover, the best national regression model gives difference in the order of 18% with respect to the curve number results. Other national models give results very far away from those of the curve number (up to 95%), which can be considered as measures for their awful accuracy. Hence, the curve number is recommended as an optimum methodology for flood estimation, in Makkah city, in case of availability of geological, metrological, land use, and topographic datasets. Otherwise, a specific national regression model (Al-Subai) may be utilized in a simple way.  相似文献   

Dominant impact of South Asian low heat on summer monsoon rainfall over Central India     

Muhammad Jawed Iqbal  Mirza Jawwad Baig  Saba Naz 《Arabian Journal of Geosciences》2013,6(6):2001-2008

Although previous literature have considered Southern Oscillation Index (SOI), Indian Dipole, and SST as the major teleconnection patterns to explain the variability of summer monsoon rainfall over India. South Asia low pressure and Indian Ocean high are the centers of action that dominates atmospheric circulations in Indian continent. This paper examines the possible impact of South Asian low pressure distribution on the variability of summer monsoon rainfall of India using centers of action approach. Our analysis demonstrates that the explanation of summer monsoon rainfall variability over Central India is improved significantly if the SOI is replaced by South Asian low heat. This contribution also explains the physical mechanisms to establish the relationships between the South Asian low heat and regional climate by examining composite maps of large-scale circulation fields using NCEP/NCAR Reanalysis data.  相似文献   

Vortex formation in nonlinearly coupled modes in a magnetized quantum plasma     

Arshad M. Mirza  W. Masood  Tufail A. Khan 《Astrophysics and Space Science》2013,346(1):279-284

Linear and nonlinear properties of coupled modes in a magnetized quantum plasma in the presence of electron Fermi pressure are studied in a nonuniform magnetoplasma composed of electrons, ions, and extremely massive and negatively charged immobile dust grains. Stationary solutions of the nonlinear equations that govern the dynamics of coupled modes are presented. It is found that electrostatic dipolar vortex structure can form in such a plasma. The dipolar structures in dense plasmas are observed to be formed on a much shorter scalelength by comparison with their classical counterparts. It is found that the increasing Fermi temperature shortens the scalelength over which the nonlinear coherent structures are formed. The relevance of the present investigation with regard to the dense astrophysical plasmas is also pointed out.  相似文献   

Use of satellite data for tectonic interpretation,nw Himalaya     

Chirashree?Mohanty  Dibya?J.?BaralEmail author  Javed?N.?Malik 《Journal of the Indian Society of Remote Sensing》2004,32(3):241-247

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