Impact of missing flow on active inundation areas and transformation of parafluvial wetlands in Punarbhaba–Tangon river basin of Indo-Bangladesh     

Swades Pal 《国际地球制图》2019,34(10):1055-1074

Punarbhaba river of Indo-Bangladesh has experienced hydro-ecological alteration after installation of Komardanga dam in 1992 and consequently wetland and inundation areas have undergone into transformation. The present work intends to explore the impact of flow attenuation on contemporary and upcoming flood extent and flood plain wetlands. In post-dam condition, average and maximum flows are attenuated by 36 and 41%, respectively, and as a result the active flood prone area is squeezed considerably by 39.72%. Average flood water depth is also reduced by 37.87% (4.45metre) after flow modification. Due to shrinkages of flood prone areas, wetland area is also reduced from 215.70 to 90.40 km² and larger part of the present wetland area is under stress and critical state. Predicted flood prone areas in next 25 years will be 328.91 km² and consequently 65.63 km² wetland areas may further be under hydro-ecological threats. Release of ecological flow is essential to restore and preserve the wetland.  相似文献   

Temporal trends in cyanobacteria revealed through DNA and pigment analyses of temperate lake sediment cores     

S. Pal  I. Gregory-Eaves  F. R. Pick 《Journal of Paleolimnology》2015,54(1):87-101

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Atmospheric motion vector retrieval using improved tracer selection algorithm     

Inderpreet Kaur  S. K. Deb  C. M. Kishtawal  P. K. Pal  Raj Kumar 《Theoretical and Applied Climatology》2015,119(1-2):299-312

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A reinterpretation of two chertbreccias from the Proterozoic basins of India     

Vivek S. Kale  Shilpa Patil Pillai 《Journal of the Geological Society of India》2011,78(5):429-445

Several horizons of a unique lithotype called “chertbreccia” are interbedded within the Proterozoic platform sediments of the Peninsular India. These cherty rocks with brecciated texture appearing as blocky masses were earlier diversely interpreted as being products of disparate processes such as fault-zone breccias, collapse breccias, and so on. Two of these horizons, one from the Kaladgi Basin (Dharwar Craton) and the other from the Dhar Forest Inlier of the Vindhyanchal Basin (Bundelkhand — Aravalli Craton) are compared in context of their geological setting, field relations and petrological constitution. A model of the mode of development of these peculiar rocks is reconstructed, taking into account their characters and limitations of previous interpretations. They are interpreted as transported debris deposits of syntectonogenic material released during the episodic activity of the growth faults of the Kaladgi and Vindhyanchal Basins that was diagenetically silicified.  相似文献   

Impact of satellite soundings on the simulation of heavy rainfall associated with tropical depressions   总被引：1，自引：1，他引：0  

V. Rakesh  R. Singh  P. K. Pal  P. C. Joshi 《Natural Hazards》2011,58(3):945-980

The present study is carried out to examine the impact of temperature and humidity profiles from moderate resolution imaging spectroradiometer (MODIS) or/and atmospheric infrared sounder (AIRS) on the numerical simulation of heavy rainfall events over the India. The Pennsylvania State University–National Centre for Atmospheric Research fifth-generation mesoscale model (MM5) and its three-dimensional variational (3D-Var) assimilation technique is used for the numerical simulations. The heavy rainfall events occurred during October 26–29, 2005, and October 27–30, 2006, were chosen for the numerical simulations. The results showed that there were large differences observed in the initial meteorological fields from control experiment (CNT; without satellite data) and assimilation experiments (MODIS (assimilating MODIS data), AIRS; (assimilating AIRS data); BOTH (assimilating MODIS and AIRS data together)). The assimilation of satellite data (MODIS, AIRS, and BOTH) improved the predicted thermal and moisture structure of the atmosphere when compared to CNT. Among the experiments, the predicted track of tropical depressions from MODIS was closer to the observed track. Assimilation of MODIS data also showed positive impact on the spatial distribution and intensity of predicted rainfall associated with the depressions. The statistical skill scores obtained for different experiments showed that assimilation of satellite data (MODIS, AIRS, and BOTH) improved the rainfall prediction skill when compared to CNT. Root mean square error in quantitative rainfall prediction is less in the experiment which assimilated MODIS data when compared to other experiments.  相似文献   

Impact of Kalpana-1 retrieved multispectral AMVs on Mahasen tropical cyclone forecast     

Inderpreet Kaur  Prashant Kumar  S. K. Deb  C. M. Kishtawal  P. K. Pal  Raj Kumar 《Natural Hazards》2015,77(1):205-222

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On the development of a coupled regional climate–vegetation model RCM–CLM–CN–DV and its validation in Tropical Africa     

Guiling Wang  Miao Yu  Jeremy S. Pal  Rui Mei  Gordon B. Bonan  Samuel Levis  Peter E. Thornton 《Climate Dynamics》2016,46(1-2):515-539

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Theoretical study of lower ionospheric response to solar flares: sluggishness of D-region and peak time delay     

Sourav Palit  Tamal Basak  Sujay Pal  Sandip K. Chakrabarti 《Astrophysics and Space Science》2015,356(1):19-28

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Better air for better health: Forging synergies in policies for energy access,climate change and air pollution     

Shilpa Rao  Shonali Pachauri  Frank Dentener  Patrick Kinney  Zbigniew Klimont  Keywan Riahi  Wolfgang Schoepp 《Global Environmental Change》2013,23(5):1122-1130

Air pollution and its related health impacts are a global concern. This paper addresses how current policies on air pollution, climate change and access to clean cooking fuels can effectively reduce both outdoor and household air pollution and improve human health. A state of the art modeling framework is used that combines an integrated assessment model and an atmospheric model to estimate the spatial extent and distribution of outdoor air pollution exposures. Estimates of household energy access and use are modeled by accounting for heterogeneous household energy choices and affordability constraints for rural and urban populations spanning the entire income distribution. Results are presented for 2030 for a set of policy scenarios on air pollution, climate change and energy access and include spatially explicit emissions of air pollutants; ambient concentrations of PM2.5; and health impacts in terms of disability adjusted life years (DALYs) from both ambient and household air pollution. The results stress the importance of enforcing current worldwide air quality legislation in addressing the impacts of outdoor air pollution. A combination of stringent policies on outdoor air pollution, climate change and access to clean cooking fuels is found to be effective in achieving reductions in average ambient PM2.5 exposures to below World Health Organization recommended levels for a majority of the world's population and results in a significant decline in the global burden of disease from both outdoor and household air pollution.  相似文献   

Accuracy improvement of ASTER stereo satellite generated DEM using texture filter     

Mandla V.Ravibabu  Kamal Jain  Surendra Pal Singh  Naga Jyothi Meeniga 《地球空间信息科学学报》2010,13(4):257-262

The grid DEM(digital elevation model) generation can be from any of a number of sources:for instance,analogue to digital conversion of contour maps followed by application of the TIN model,or direct elevation point modelling via digital photogrammetry applied to airborne images or satellite images.Currently,apart from the deployment of point-clouds from LiDAR data acquisition,the generally favoured approach refers to applications of digital photogrammetry.One of the most important steps in such deployment i...  相似文献