A mathematical model has been developed to analyze the influence of extreme water waves over multiconnected regions in Visakhapatnam Port, India by considering an average water depth in each multiconnected regions. In addition, partial reflection of incident waves on coastal boundary is also considered. The domain of interest is divided mainly into two regions, i.e., open sea region and harbor region namely as Region-I and Region-II, respectively. Further, Region-II is divided into multiple connected regions. The 2-D boundary element method (BEM) including the Chebyshev point discretization is utilized to solve the Helmholtz equation in each region separately to determine the wave amplification. The numerical convergence is performed to obtain the optimum numerical accuracy and the validation of the current numerical approach is also conducted by comparing the simulation results with existing studies. The four key spots based on the moored ship locations in Visakhapatnam Port are identified to perform the numerical simulation. The wave amplification at these locations is estimated for monochromatic incident waves, considering approximate water depth and different reflection coefficients on the wall of port under the resonance conditions. In addition, wave field analysis inside the Visakhapatnam Port is also conducted to understand resonance conditions. The current numerical model provides an efficient tool to analyze the amplification on any realistic ports or harbors.
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Behera Rashmisikha Kar Abhipsa Das Manas Ranjan Panda Prachi Prava 《Natural Hazards》2019,96(2):731-751
Natural Hazards - The 485-km-long coastline of Odisha, a state in the northeastern part of the Indian peninsula, is potentially vulnerable to several disaster events that take place frequently. In... 相似文献
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Dibyendu Dutta Prachi Goel Manisha Singh Vinay Kumar Dadhwal Rodda Suraj Reddy 《国际地球制图》2017,32(3):286-297
A simple and exclusively satellite-based instantaneous net radiation (INR) and its components have been estimated and it is based on the method proposed. The method has been used to check its suitability over West Bengal, India on clear sky days which is eliminating the need for ground-based observations. The method explicitly recognizes the need for spatially varied input parameters to estimate net radiation using remote sensing information and provides a distributed daily average net radiation map with finer spatial resolution. The satellite-derived radiative flux components were compared with the Eddy Flux Tower measurements located at Bonnie camp within mangrove forest. The bias, root-mean square error and R2 between modelled and measured INR are 52.07, 49.5 W m?2 and 0.74, respectively which are within the acceptable limit. The errors in the downward short wave and long wave as well as upward short-wave and long-wave radiative flux are 13.78, 3.54, 12.41 and 3.54%, respectively. Further, variations of all the radiative flux components were analysed over different eco-systems. 相似文献
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如果我们能够将美国地下约3km深度的地热全部提取出来，将会满足美国未来3万年的能量需求（根据目前的使用量）。将所有的能源取尽是不可能的，这涉及到技术和经济层面的问题，但是只要提取这些地热资源的5％就能够生产出满足2．6亿美国人需要的用电量。美国国家能源部可再生能源实验室（NREL， 相似文献
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Prashant K. Srivastava Prachi Singh R. K. Mall Rajani K. Pradhan Michaela Bray Akhilesh Gupta 《Theoretical and Applied Climatology》2020,140(1):145-156
Accurate estimation of evapotranspiration is generally constrained due to lack of required hydrometeorological datasets. This study addresses the performance analysis of reference evapotranspiration (ETo) estimated from NASA/POWER, National Center for Environmental Prediction (NCEP) global reanalysis data before and after dynamical downscaling through the Weather Research and Forecasting (WRF) model. The state-of-the-art Hamon’s and Penman-Monteith’s methods were utilized for the ETo estimation in the Northern India. The performance indices such as bias, root mean square error (RMSE), and correlation (r) were calculated, which showed the values 0.242, 0.422, and 0.959 for NCEP data (without downscaling) and 0.230, 0.402, and 0.969 for the downscaled data respectively. The results indicated that after WRF downscaling, there was some marginal improvement found in the ETo as compared to the without downscaling datasets. However, a better performance was found in the case of NASA/POWER datasets with bias, RMSE, and correlation values of 0.154, 0.348, and 0.960 respectively. In overall, the results indicated that the NASA/POWER and WRF downscaled data can be used for ETo estimation, especially in the ungauged areas. However, NASA/POWER is recommended as the ETo calculations are less computationally expensive and easily available than performing WRF simulations. 相似文献
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C. Sudhakar Reddy A. Giriraj Shilpa Babar Prachi Ugle S. Sudhakar 《Journal of the Indian Society of Remote Sensing》2010,38(4):633-639
At present the biodiversity in Eastern Ghats is threatened by loss of habitats, exploitation and unscientific management of
natural resources, forest fire, biological invasion and other anthropogenic pressures. In this context, we have assessed the
forest cover changes, fragmentation and disturbance in the R.V. Nagar Range of Eastern Ghats region, Andhra Pradesh using
satellite remote sensing and GIS techniques. Satellite data of IRS-1A LISS II of 1988 and IRS-P6 LISS III of 2006 were assessed
for forest cover changes in 1 sq.km grid and generated as Sensitivity Index map. Further the road and settlement buffer of
1000 m was generated to represent Threat Index map. From 1988 to 2006, the forest cover had a total cover loss of 35.2 sq.km
and increase in scrub cover by 7.2%. Over all change analysis from 1988 to 2006 with reference to forest cover indicates,
negative changes (loss of forest area) accounted for 48.1 sq.km area and positive changes (gain of forest) for an area of
12.1 sq.km of area. The results of the change detection using multi-date satellite imagery suggest degradation in forest cover
over two decades, which necessitates the conservation measures in this range with high priority. 相似文献
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Natural Hazards - In the Indian Himalayan region, landslide is one of the most recurring natural disasters intimidating human lives and is detrimental to infra-structures,... 相似文献
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Ocean Dynamics - A mathematical model based on the three-dimensional (3-D) boundary element method (BEM), including porous and non-porous breakwaters, is developed to determine the wave trapping... 相似文献
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