Changes in monsoon precipitation patterns over Bangladesh and its teleconnections with global climate     

Azad  Md. Abul Kalam  Islam  Abu Reza Md. Towfiqul  Ayen  Kurratul  Rahman  Md. Siddiqur  Shahid  Shamsuddin  Mallick  Javed 《Theoretical and Applied Climatology》2022,148(3-4):1261-1278

Theoretical and Applied Climatology - Understanding changes in monsoon precipitation patterns is crucial as it determines the occurrence, intensity, and duration of floods and droughts in...  相似文献   

Spatio-temporal land cover changes in a semi-arid watershed: Central India     

Mohd Yousuf Khanday  Akram Javed 《Journal of the Geological Society of India》2016,88(5):576-584

Land use/land cover change is a global phenomenon which reflects natural resources degradation and/or utilization. Remote sensing and GIS have been widely used to monitor such changes at watershed level. The present study evaluates the LU/LC change during 1989 - 2001 in a semi-arid watershed of central India. Geocoded satellite data of 1989 and 2001 on 1:50,000 scale, were visually interpreted to prepare thematic maps which were later digitized using ArcGIS softwares. The analysis shows that vast tracts of cultivated land have become uncultivated and at some places even converted to wasteland. However, the land under dense forest and open forest has decreased due to expansion of built-up land and other anthropogenic activities. Increase in area of uncultivated land, wasteland and decrease in cultivated land and open scrub is also supported by rainfall analysis, which shows a declining trend and a fall of 186.93 mm in average annual rainfall for 1986-2003 period. The change detection map prepared using land use/land cover of 1989 and 2001 as inputs shows that out of the total geographical area of the watershed, 25.78% of the watershed area has seen a change from one land use category to another, however rest 74.22% has remained unchanged.  相似文献   

Mapping vulnerability to multiple stressors: climate change and globalization in India   总被引：7，自引：0，他引：7  

Karen O&#x;Brien  Robin Leichenko  Ulka Kelkar  Henry Venema  Guro Aandahl  Heather Tompkins  Akram Javed  Suruchi Bhadwal  Stephan Barg  Lynn Nygaard  Jennifer West 《Global Environmental Change》2004,14(4):627

There is growing recognition in the human dimensions research community that climate change impact studies must take into account the effects of other ongoing global changes. Yet there has been no systematic methodology to study climate change vulnerability in the context of multiple stressors. Using the example of Indian agriculture, this paper presents a methodology for investigating regional vulnerability to climate change in combination with other global stressors. This method, which relies on both vulnerability mapping and local-level case studies, may be used to assess differential vulnerability for any particular sector within a nation or region, and it can serve as a basis for targeting policy interventions.  相似文献   

GIS-based spatial landslide distribution analysis of district Neelum,AJ&K,Pakistan     

Naseer  Shah  Haq  Tanveer Ul  Khan  Abdullah  Tanoli  Javed Iqbal  Khan  Nangyal Ghani  Qaiser  Faizan-ur-Rehman  Shah  Syed Tallataf Hussain 《Natural Hazards》2021,106(1):965-989

Natural Hazards - The Landslide happens in mountainous regions due to the catastrophe of slope through intensive rain and seismicity. The Himalayas is one of the susceptible parts of the world in...  相似文献   

Stability of Charged Thin-Shell Wormholes with Weyl Corrections     

Sharif  M.  Javed  F. 《Astronomy Reports》2021,65(5):353-361

Astronomy Reports - This paper is devoted to examining the effects of charge and Weyl coupling parameter on the stable configuration of thin-shell wormholes. We use a cut and paste approach to...  相似文献   

Estimating Preferential Flow in Karstic Aquifers Using Statistical Mixed Models     

Angel A. Anaya  Ingrid Padilla  Raul Macchiavelli  Dorothy J. Vesper  John D. Meeker  Akram N. Alshawabkeh 《Ground water》2014,52(4):584-596

Karst aquifers are highly productive groundwater systems often associated with conduit flow. These systems can be highly vulnerable to contamination, resulting in a high potential for contaminant exposure to humans and ecosystems. This work develops statistical models to spatially characterize flow and transport patterns in karstified limestone and determines the effect of aquifer flow rates on these patterns. A laboratory‐scale Geo‐HydroBed model is used to simulate flow and transport processes in a karstic limestone unit. The model consists of stainless steel tanks containing a karstified limestone block collected from a karst aquifer formation in northern Puerto Rico. Experimental work involves making a series of flow and tracer injections, while monitoring hydraulic and tracer response spatially and temporally. Statistical mixed models (SMMs) are applied to hydraulic data to determine likely pathways of preferential flow in the limestone units. The models indicate a highly heterogeneous system with dominant, flow‐dependent preferential flow regions. Results indicate that regions of preferential flow tend to expand at higher groundwater flow rates, suggesting a greater volume of the system being flushed by flowing water at higher rates. Spatial and temporal distribution of tracer concentrations indicates the presence of conduit‐like and diffuse flow transport in the system, supporting the notion of both combined transport mechanisms in the limestone unit. The temporal response of tracer concentrations at different locations in the model coincide with, and confirms the preferential flow distribution generated with the SMMs used in the study.  相似文献   

Chemical Characterization and Source Apportionment of Atmospheric Particles Across Multiple Sampling Locations in Faisalabad,Pakistan   总被引：1，自引：0，他引：1       下载免费PDF全文

Wasim Javed  Anthony S. Wexler  Ghulam Murtaza  Muhammad Mazhar Iqbal  Yongjing Zhao  Tayyaba Naz 《洁净——土壤、空气、水》2016,44(7):753-765

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Four major unknown active faults identified,using satellite data,in India and Pakistan portions of NW Himalaya     

Shah  A. A.  Malik  Javed N. 《Natural Hazards》2017,88(3):1845-1865

Natural Hazards - New mapping through geomorphic analysis of tectonic landforms using a variety of freely available satellite data, including shuttle radar topography and Google Maps, has revealed...  相似文献   

Estimation of Seismic Landslide Hazard in the Eastern Himalayan Syntaxis Region of Tibetan Plateau     

DU Guoliang  ZHANG Yongshuang  YANG Zhihu  Javed IQBAL  TONG Bin  GUO Changbao  YAO Xin  WU Ruian 《《地质学报》英文版》2017,91(2):658-668

The eastern Himalayan syntaxis is one of the most tectonically active and earthquake-prone regions on Earth where earthquake-induced geological disasters occur frequently and caused great damages. With the planning and construction of Sichuan-Tibet highway, Sichuan-Tibet railway and hydropower development on the Yarlung Zangbo River etc. in recent years, it is very important to evaluate the seismic landslide hazard of this region. In this paper, a seismic landslide hazard map is produced based on seismic geological background analysis and field investigation using Newmark method with 10% PGA exceedance probabilities in future 50 years by considering the influence of river erosion, active faults and seismic amplification for the first time. The results show that the areas prone to seismic landslides are distributed on steep slopes along the drainages and the glacier horns as well as ridges on the mountains. The seismic landslide hazard map produced in this study not only predicts the most prone seismic landslide areas in the future 50 years but also provides a reference for mitigation strategies to reduce the exposure of the new building and planning projects to seismic landslides.  相似文献   

Uptake of hazardous elements by spring onion (<Emphasis Type="Italic">Allium fistulosum</Emphasis> L.) from soil irrigated with different types of water and possible health risk     

Kafeel Ahmad  Zafar Iqbal Khan  Asma Ashfaq  Muhammad Ashraf  Nudrat Aisha Akram  Muhammad Sher  Hazoor Ahmad Shad  Vincenzo Tufarelli  Antonio Lonigro  Mariano Fracchiolla  Eugenio Cazzato 《Environmental Earth Sciences》2017,76(8):322

Bio-concentration of elements such as Mo, As, Se, Fe, Cu, Zn, Ni and Pb was analyzed in spring onion (Allium fistulosum L.) in three different locations of central Punjab, Pakistan. At location GW, relatively low level of hazardous elements was found in spring onion, suggesting that groundwater is a safe source of water for irrigating food crops. The pH of soil at wastewater irrigation was found less acidic (pH 7.4) than the other sites. The range of concentration in the different samples of spring onion was as follows: 6.15–8.16 mg kg^?1 for Mo, 2.77–4.28 mg kg^?1 for As, 0.395–0.705 mg kg^?1 for Se, 36.73–48.17 mg kg^?1 for Fe, 10.58–16.26 mg kg^?1 for Cu, 28.87–39.79 mg kg^?1 for Zn, 6.66–8.75 mg kg^?1 for Ni and 4.33–6.09 mg kg^?1 for Pb, respectively. High bio-concentration of Zn (15.37) from soil to spring onion was found at canal water irrigated location. The estimated daily intake of metal for spring onion was less, but the health risk index was higher than 1 for Mo, As, Cu, Pb and Ni, respectively. This was due to higher proportion of spring onion in diet, which consequently increased the health risk index for metals. Therefore, it is recommended to avoid growing vegetables in untreated urban and rural wastewater containing elevated amounts of metals.  相似文献