Using InfoVal method and GIS techniques for the spatial modelling of landslide susceptibility in the upper catchment of river Meenachil in Kerala   总被引：1，自引：0，他引：1  

H. Vijith  P. G. Rejith  G. Madhu 《Journal of the Indian Society of Remote Sensing》2009,37(2):241-250

A GIS-based statistical methodology for landslide susceptibility zonation is described and its application to a study area in the Western Ghats of Kerala (India) is presented. The study area was approximately 218.44 km² and 129 landslides were identified in this area. The environmental attributes used for the landslide susceptibility analysis include geomorphology, slope, aspect, slope length, plan curvature, profile curvature, elevation, drainage density, distance from drainages, lineament density, distance from lineaments and land use. The quantitative relationship between landslides and factors affecting landslides are established by the data driven-Information Value (InfoVal) — method. By applying and integrating the InfoVal weights using ArcGIS software, a continuous scale of numerical indices (susceptibility index) is obtained with which the study area is divided into five classes of landslide susceptibility. In order to validate the results of the susceptibility analysis, a success rate curve was prepared. The map obtained shows that a great majority of the landslides (74.42%) identified in the field were located in susceptible and highly susceptible zones (27.29%). The area ratio calculated by the area under curve (AUC) method shows a prediction accuracy of 80.45%. The area having a high scale of susceptibility lies on side slope plateaus and denudational hills with high slopes where drainage density is relatively low and terrain modification is relatively intense.  相似文献   

RESETTLEMENT EXPERIENCES AND ALTERNATIVES IN THAILAND     

Gopal B. Thapa  M.A.  M.Sc.  Karl E. Weber  M.A.  D. Phil. 《Singapore journal of tropical geography》1989,9(2):141-150

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Questions and comments that followed the panel discussion     

J. V. Narlikar  T. Padmanabhan  Geoff Burbidge  H. C. Arp  R. Cowsik  Arati Chokshi  J. C. Pecker  Tarun Souradeep  Pasupathy  Rohini Godbole  Gopal Krishna  R. Cowsik  D. F. Roscoe  N. Mukunda 《Journal of Astrophysics and Astronomy》1997,18(4):477-489

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Erratum to: Sediment identification using free fall penetrometer acceleration-time histories     

Gopal K. Mulukutla  Lloyd C. Huff  Jeffrey S. Melton  Kenneth C. Baldwin  Robert A. McConnaughey  Larry A. Mayer 《Marine Geophysical Researches》2011,32(3):413-413

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Impacts of shrimp farming in Bangladesh: Challenges and alternatives     

Brojo Gopal Paul  Christian Reinhard Vogl 《Ocean & Coastal Management》2011,54(3):201-211

Shrimp farming is growing in Bangladesh due to suitable agro-climatic conditions, adequate water resources, cheap labour force, international donor agencies and the involvement of multinational corporations. Although it provides immediate economic benefits, contributes to poverty reduction and food security, as well as generates employment from seed collectors to exporters, it has also been facing a host of challenges. They hinder the sustainable development of this otherwise thriving sector. This paper aims to expound the hindrances and challenges for sustainable shrimp farming in Bangladesh by means of reviewing the available scientific literature. It finds that socioeconomic impacts such as traditional livelihood displacement, social unrests and market fluctuations are hindering the sustainable development of shrimp farming in Bangladesh. Similarly, environmental impacts such as mangrove degradation, salt water intrusion, sedimentation, pollution and disease outbreaks are found to be obstacles for the development of sustainable shrimp farming. Inappropriate management practices and inadequate plans regarding water quality, seed supply, irrigation facilities and fishery resources, added to institutional weaknesses, jeopardize the future growth of shrimp farming. Therefore, this paper shall provide substantial input to set the directions that research for alternatives can take and that can contribute to the sustainability of shrimp farming.  相似文献   

Geochemistry of the Neoproterozoic Narji limestone,Cuddapah Basin,Andhra Pradesh,India: implication on palaeoenvironment     

Adrika Roy  Gopal Chakrabarti  Debasish Shome 《Arabian Journal of Geosciences》2018,11(24):784

The Neoproterozoic Narji Formation of Cuddapah Basin, Southern India is mainly composed of limestones with minor amount of clastic rocks. Limestones are massive as well as laminated and occasionally chert bearing. Geochemistry (major, trace, and REE) of limestones is studied to strengthen the knowledge on depositional environment of Narji Formation in the direction to better figure out the development of Cuddapah Basin during Neoproterozoic era. Average SiO₂ (25.97), Al₂O₃/TiO₂ (16.67), and K₂O/Al₂O₃ (0.21) ratios suggest clastic contamination in the Narji limestones. PAAS (Post Archean Australian Shale) normalized REE?+?Y pattern of Narji limestones are showing seawater like REE?+?Y pattern. The Er/Nd and Y/Ho ratios (average 0.17 and 35.68, respectively) of Narji limestones indicate the retention of normal seawater character with the signatures of terrigenous input and diagenesis process. Positive Ce anomaly, high U/Th (>?1.25), and V/(V?+?Ni) (>?0.5) ratios of Narji limestones clearly indicate their deposition in dyoxic to anoxic condition.  相似文献   

anem: A Simple Web-Based Platform to Build Stakeholder Understanding of Groundwater Behavior     

Gopal Penny  Connor Mullen  Diogo Bolster  Bruce Huber  Marc F. Müller 《Ground water》2021,59(2):273-280

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Current state of knowledge regarding the world’s wetlands and their future under global climate change: a synthesis   总被引：1，自引：0，他引：1  

Wolfgang J. Junk  Shuqing An  C. M. Finlayson  Brij Gopal  Jan Květ  Stephen A. Mitchell  William J. Mitsch  Richard D. Robarts 《Aquatic Sciences - Research Across Boundaries》2013,75(1):151-167

Wetlands cover at least 6 % of the Earth’s surface. They play a key role in hydrological and biogeochemical cycles, harbour a large part of the world’s biodiversity, and provide multiple services to humankind. However, pressure in the form of land reclamation, intense resource exploitation, changes in hydrology, and pollution threaten wetlands on all continents. Depending on the region, 30–90 % of the world’s wetlands have already been destroyed or strongly modified in many countries with no sign of abatement. Climate change scenarios predict additional stresses on wetlands, mainly because of changes in hydrology, temperature increases, and a rise in sea level. Yet, intact wetlands play a key role as buffers in the hydrological cycle and as sinks for organic carbon, counteracting the effects of the increase in atmospheric CO₂. Eight chapters comprising this volume of Aquatic Sciences analyze the current ecological situation and the use of the wetlands in major regions of the world in the context of global climate change. This final chapter provides a synthesis of the findings and recommendations for the sustainable use and protection of these important ecosystems.  相似文献   

Development of Remote Sensing Based Models for Surface Water Quality          下载免费PDF全文

Tahir Ali Akbar  Quazi K. Hassan  Gopal Achari 《洁净——土壤、空气、水》2014,42(8):1044-1051

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Evolution of Palaeo-Mesoproterozoic open coast ramp-clues from stromatolite-bearing carbonate facies of Vempalle Formation,Cuddapah Basin,India     

Suparna Bose  Gopal Chakrabarti  Debasish Shome 《Arabian Journal of Geosciences》2017,10(10):226

The carbonate-dominated Palaeo-Mesoproterozoic Vempalle Formation of the Cuddapah Basin, Southern India, represents deposition in a supratidal-subtidal setting. The facies associations, deciphered from this study, are consistent with continued gradual rise of sea level with little or no sedimentary influx during the deposition of sediments, wherein gradual deposition of carbonates are recorded with increased accommodation. The broad development of stromatolites in different layers of sediments across the coast indicates a moderately high-energy open coastline. The prolific volcanism as recorded at the top of the succession ultimately shuts down the Vempalle carbonate factory.  相似文献