Geological evidences of extreme waves along the Gujarat coast of western India     

Nilesh Bhatt  Madhav K. Murari  Vishal Ukey  S. P. Prizomwala  A. K. Singhvi 《Natural Hazards》2016,84(3):1685-1704

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Geomorphology,sedimentology and minimum exposure ages of streamlined subglacial landforms in the NW Himalaya,India          下载免费PDF全文

Sourav Saha  Milap C. Sharma  Madhav K. Murari  Lewis A. Owen  Marc W. Caffee 《Boreas: An International Journal of Quaternary Research》2016,45(2):284-303

Streamlined subglacial landforms that include drumlins in three study areas, the upper Chandra valley around Chandra Tal, the upper Spiti Valley and the middle Yunam Valley of the NW Himalaya of India were mapped and studied using geomorphic, sedimentological and geochronological methods. These streamlined subglacial landforms include a variety of morphological types, including: (i) half egg‐shaped forms; (ii) complex superimposed forms; (iii) dome‐shaped forms; (iv) inverse forms; and (v) flat‐topped symmetrical forms. Sedimentological data indicate that subglacial deformational processes are responsible for the formation of the streamlined subglacial landforms in the Chandra Tal and upper Spiti Valley study areas. In contrast, streamlined landforms in the middle Yunam Valley are the result of melt‐out and subglacial erosional processes. In the Yunam Valley study area, 11 new cosmogenic ¹⁰Be surface exposure ages were obtained for boulders inset into the crests of streamlined subglacial landforms and moraines, and also for a bedrock surface. The streamlined landforms date to 8–7 ka, providing evidence of an early Holocene valley glaciation, and older moraines date to ～17–15 and 79–52 ka, representing other significant valley glacial advances in the middle Yunam Valley. The subglacial landforms in the Chandra Valley provide evidence for a ≥300‐m‐thick Lateglacial glacier that advanced southeast, overtopping the Kunzum Range, and advancing into the upper Spiti Valley. The streamlined subglacial landforms in these study areas of the NW Himalaya highlight the usefulness of such landforms in developing glacial chronostratigraphy and for understanding the dynamics of Himalayan glaciation.  相似文献   

Subsidence of Holocene sediments in the Godavari delta, India     

K. Nageswara Rao  N. Sadakata  Vasant Shinde  A. S. Rajawat  Ajai 《Frontiers of Earth Science》2010,4(4):410-416

The present study is an attempt to estimate the rates of subsidence in the Holocene sediments of the Godavari delta along the east coast of India. Two boreholes dug at Panangipalli village in the delta revealed Early Historic culture material such as potsherds including Coarse Red ware, Red-Slipped ware, Coarse Grey ware, and Black and Red ware, between 3.5 m and 9.0 m below the surface level. This suggests that the location was a human settlement of Andhra Satavahana period which flourished in the region between 3rd century BC and 3rd century AD. The fossil shells of Anadara sp. recovered from the borehole further downward at 11.5 m below the surface are considered to represent the intertidal swampy/lagoonal environment. The age of the shells was determined through AMS ¹⁴C dating as 6400 cal a BP. The presence of about 2.5m thick intertidal swampy/lagoonal material between 9.0 m and 11.5 m depth, suggests post-depositional subsidence at an average rate of less than 1.0 mm·a⁻¹. However, a higher rate of subsidence of about 2.0 mm to 4.0 mm·a⁻¹ is estimated for the upper 9.0 m thick floodplain sediment unit which embeds the Early Historic culture remains. The increased rates of subsidence during the last two millennia when compared to the earlier period in this part of the Godavari delta could be due to anthropogenic activity of deforestation and agriculture leading to accelerated soil erosion in the catchment and increased sedimentation in the delta.  相似文献   

Iron accumulation in the sessile barnacle,Balanus amaryllis (Darwin)     

S Udaya Bhaskar  A.C Anil  A.B Wagh 《Marine pollution bulletin》1983,14(6):236-237

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Propagation ofSH waves in an infinite elastic plate with Cauchy's initial transverse stress     

D. K. Wagh 《Pure and Applied Geophysics》1972,99(1):49-54

Summary Cauchy theory of initial stress has been applied to investigate the problem of SH waves in an initialy stressed elastic plate. The initial stress is assumed to be a uniform tension or compression along the thickness of the plate. It is found that the initial stress influences the velocities of the dispersive modes only but, it has no influence on the velocity of the non-dispersive wave.  相似文献   

Distribution of particulate organic carbon in the central Arabian Sea     

N B Bhosle  V M Dhople  A B Wagh 《Journal of Earth System Science》1988,97(1):35-47

Particulate organic carbon (POC) of 161 water samples collected from 8 depths (surface to 1000 m) at 21 stations was measured. The POC concentrations ranged from 154 to 554 ¼g per litre at the surface and decreased in the upper 300 m water column. At greater depths (> 300 m), POC concentrations increased and were similar (145 to 542 ¼g1^?1) to those observed at surface. Deep water POC maximum was embedded within the oxygen minimum layer and was also associated with high phosphate-phosphorus. The POC contents increased, whereas oxygen decreased as the distance away from the shore increased. Phytoplankton biomass was a major source of POC. The observed pattern of POC is discussed with respect to some physicochemical and biological factors.  相似文献   

Analysis of Y-component of Geomagnetic Field and SYM-H Index Using Wavelet Multiresolution Analysis     

Santosh Sapkota  Saurav  Sarup Khadka  Gautam  Sabin  Karki  Monika  Adhikari  Binod  Mishra  Roshan Kumar  Klausner  Virginia  Dhungana  Beni Madhav 《Geomagnetism and Aeronomy》2022,62(1-2):125-137

Geomagnetism and Aeronomy - Electrodynamical coupling between the solar wind’s plasma and the Earth’s magnetosphere creates geomagnetic disturbances recorded on the ground. This work...  相似文献   

A Review of Coastal Fog Microphysics During C-FOG     

Gultepe  I.  Heymsfield  A. J.  Fernando  H. J. S.  Pardyjak  E.  Dorman  C. E.  Wang  Q.  Creegan  E.  Hoch  S. W.  Flagg  D. D.  Yamaguchi  R.  Krishnamurthy  R.  Gaberšek  S.  Perrie  W.  Perelet  A.  Singh  D. K.  Chang  R.  Nagare  B.  Wagh  S.  Wang  S. 《Boundary-Layer Meteorology》2021,181(2-3):227-265

Boundary-Layer Meteorology - Our goal is to provide an overview of the microphysical measurements made during the C-FOG (Toward Improving Coastal Fog Prediction) field project. In addition, we...  相似文献   

Simulations of Coastal Fog in the Canadian Atlantic with the Weather Research and Forecasting Model     

Dimitrova  Reneta  Sharma  Ashish  Fernando  Harindra J. S.  Gultepe  Ismail  Danchovski  Ventsislav  Wagh  Sandeep  Bardoel  Stef L.  Wang  Sen 《Boundary-Layer Meteorology》2021,181(2-3):443-472

Boundary-Layer Meteorology - We evaluate the efficacy of microphysics and planetary-boundary-layer (PBL) parametrizations of the Weather Research and Forecasting (WRF) model for simulation of the...  相似文献   

Least Square Support Vector Machine Applied to Slope Reliability Analysis     

Pijush Samui  Tim Lansivaara  Madhav R. Bhatt 《Geotechnical and Geological Engineering》2013,31(4):1329-1334

This paper investigates the feasibility of Least square support vector machine (LSSVM) model to cope the problem of implicit performance function during first order second moment (FOSM) method based slope reliability analysis. LSSVM is firmly based on the theory of statistical learning. In LSSVM, Vapnik’s ε -insensitive loss function has been replaced by a cost function which corresponds to a form of ridge regression. Here, LSSVM has been used as a regression technique to approximate implicit performance functions. A slope example has been presented for illustrating the applicability of LSSVM based FOSM method. The developed LSSVM based FOSM has been compared with the artificial neural network (ANN) and least square method. The result shows that the approximation of LSSVM can be used in the FOSM method for slope reliability analysis.  相似文献