排序方式： 共有28条查询结果，搜索用时 15 毫秒
21.
Mathematical Geosciences - Inverse modeling techniques for estimating reservoir parameters (e.g., transmissivity, permeability) utilize some dynamic (secondary) information (e.g., hydraulic head or... 相似文献
22.
Rupal M. Brahmbhatt I. M. Bahuguna B. P. Rathore Anil V. Kulkarni Rajesh D. Shah A. S. Rajawat Jeffrey S. Kargel 《山地科学学报》2017,14(1):128-141
A study has been carried out in part of Chenab basin,Himalaya to understand the relationship between glacio-morphological factors and change in glacial area. Initially change in areal extent of glaciers was derived for two time frames(1962-2001/02 and 2001/02-2010/11). The study comprised of 324 glaciers for the monitoring period of 1962-2001/02 for,which 11% loss in glacial area was observed. Two hundred and thirty-eight glaciers were further monitored between 2001/02 and 2010/11. These glaciers showed an area loss of 1.1%. The annual deglaciation has been found to be higher during the period of 1962-2001/02 compared to 2001/02-2010/11. The spatial and temporal variability in deglaciation was also addressed usingglacio-morphic parameters. Area,length,percentage of debris cover,and various elevation parameters of glaciers were observed to have significant controls on relationships to the rate of glacial shrinkage. Largerarea and longer glaciers show a lower percentage of retreat than smaller and shorter ones. Moreover,glaciers located at lower altitudes and having gentle slopes show more area retreat. The results of area retreat in debris covered and debris free glaciers supports that the glaciers covered by debris retard ice melting at some extent. 158 glaciers were observed having no debris cover,and these exhibit 14% of loss in surface area. In glaciers having 40% debris cover,8% of deglaciation was observed. The glaciers located below equilibrium line altitude(ELA) have experienced 4.6% of deglaciation for the time frame 2001/02 – 2010/11 whereas it was found to be 1.1% for the glaciers occurring above ELA. However,theorientation of glaciers did not show any considerable influence on glacial change based on hypothesis. 相似文献
23.
The morphometric and drainage basin analysis of the Umshing River is carried out quantitatively using remote sensing and GIS
techniques. The results are presented concerning the hydrological behavior of Umshing river in order to define multi-scale
geomorphometric landform types. The Umshing basin shows a sub-trellis drainage pattern indicating the litho-structural control
on the drainage. Lithological, structural and geomorphological features control the directions of flow of the tributaries.
It is observed and inferred that the Umshing river catchment is under the stage of creep or tilting and hence is vulnerable
to geohazard. 相似文献
24.
The Shillong Plateau signifies the intense tectonic processes that the region has experienced during the Tertiary Indo-Tibetan
and Indo-Burman collisions. An attempt has been made to study the microearthquake and radon emanation rate to understand and
identify the seismotectonic zones. 相似文献
25.
Using astrometric techniques developed by Anderson et al., we determine proper motions(PMs) in the ～14.60 × 16.53 arcmin~2 area of the kinematically "thick-disk" globular cluster M12. The cluster's proximity and sparse nature makes it a suitable target for ground-based telescopes. Archive images with time gap of ～11.1 years were observed with the wide-field imager(WFI) mosaic camera mounted on the ESO 2.2 m telescope. The median value of PM error in both components is ～0.7 mas yr~(-1) for the stars having V ≤ 20 mag. PMs are used to determine membership probabilities and to separate field stars from the cluster sample. In electronic form, a membership catalog of 3725 stars with precise coordinates, PMs and BV RI photometry is being provided. One of the possible applications of the catalog is demonstrated by gathering the membership information of the variable stars, blue stragglers and X-ray sources reported earlier in the cluster's region. 相似文献
26.
Variation of Snowline and Mass Balance of Glaciers of Warwan and Bhut Basins of Western Himalaya Using Remote Sensing Technique 总被引：1，自引：0，他引：1
Rupal M. Brahmbhatt I. Bahuguna B. P. Rathore A. V. Kulkarni R. D. Shah H. C. Nainwal Ajai 《Journal of the Indian Society of Remote Sensing》2012,40(4):629-637
Glaciers are natural reservoirs of fresh water in frozen state and sensitive indicators of climate change. Among all the mountainous glaciated regions, glaciers of Himalayas form one of the largest concentrations of ice outside the Polar Regions. Almost all the major rivers of northern India originate from these glaciers and sustain perennial flow. Therefore, in view of the importance and role of the glaciers in sustaining the life on the Earth, monitoring the health of glaciers is necessary. Glacier??s health is monitored in two ways (i) by mapping the change in extent of glaciers (ii) by finding variation in the annual mass balance. This paper has been discussed the later approach for monitoring the health of glaciers of Warwan and Bhut basins. Mass balance of glaciers of these two basins was determined based on the extraction of snow line at the end of ablation season. A series of satellite images of AWiFS sensor were analysed for extraction of snowline on the glaciers for the period of 2005, 2006 and 2007. The snow line at the end of ablation season is used to compute accumulation area ratio (AAR = Accumulation area/Glacier area) for each glacier of basins. An approach based on relationship of AAR to specific mass balance (computed in field) for glaciers of Basapa basin was employed in the present study. Mean of specific mass balance of individual glacier for the year 2005, 2006 and 2007 of Warwan basin was found to be ?ve 0.19?m, ?ve 0.27?m and ?ve 0.2?m respectively. It is 0.05?m, ?ve 0.11?m and ?ve 0.19?m for Bhut basin. The analysis suggests a loss of 4.3 and 0.83?km3 of glacier in the monitoring period of 3?years for Warwan and Bhut basins respectively. The overall results suggest that the glaciers of Warwan basin and Bhut basins have suffered more loss of ice than gain in the monitoring period of 3?years. 相似文献
27.
Purvee P. Joshi S. K. Singh B. P. Rathore I. M. Bahuguna Raj Kumar 《Journal of the Indian Society of Remote Sensing》2018,46(12):2107-2111
In the summer of 2016, fire broke out in the forests of Uttarakhand state. The effect of forest fire was thought to have severe impact on nearby glaciated region in terms of faster melting. It is understood that contamination and heat enhance the snowmelt, which reduces the reflectance in different part of EM spectrum. In order to assess the effect, AWiFS and IMAGER data from Resourcesat-1 and INSAT-3D, respectively, for the months of April and May of the years 2012, 2013, 2014 and 2016 were used to compare the reflectance of snow. It was observed that pre- and post-fire data of 2016 show drop in reflectance in comparison with earlier years. The change in reflectance for locations near to forest fire was significantly high in comparison with previous year images, whereas far-away locations did not show much change. This drastic drop may be attributed to deposition of black carbon on nearby locations in snow-covered area. AWS data of nearby Joshimath observatory were also analysed to avoid any anomalous change in temperature for the same duration. 相似文献
28.
Bahuguna I. M. Nayak Shailesh Tamilarsan V. Moses J. 《Journal of the Indian Society of Remote Sensing》2003,31(2):101-105
Journal of the Indian Society of Remote Sensing - The study aims at investigating the relative role of landforms and lineaments as an integrated unit for the assessment of groundwater availability... 相似文献