Soil,landuse and land evaluation studies of Patna area Bihar     

M. L. Manchanda  Jitendra Prasad  H. S. Iyer  R. S Shukla  S. Dasgupta 《Journal of the Indian Society of Remote Sensing》1982,10(3):55-67

The soil and landuse surveys have been conducted in Patna area, Bihar, using aerial photos of 1:25,000 scale. Three major systems, Ganges Gandak and interfluvial plain, have been identified in the area. These were further sub-divided into levees plains and channels etc. The soils were classified according to Soil axonomy. The major land use of the area is cultivation (62.2%) (Upland, lowland and wet land crops) plantation (1.8%) habitation (16.0%), water bodies (8.8%), barren lands (9.4%) and miscellaneous (1.8%). The soils of the area have been evaluated for different land utilization types-upland crops, lowland crops, and habitation. For paddy 75.:%, upland crops 8.2% and for habitation 57%, area was found suitable.  相似文献   

Use of remote sensing techniques for agricultural land use survey,classification and planning     

B. M. Singh  M. L. Manchanda  H. S. Iyer  L. M. Pande  Jitendra Prasad  B. R. M. Rao 《Journal of the Indian Society of Remote Sensing》1983,11(3):1-13

A critical appraisal of the need and use of remote sensing techniques for land use mapping with particular reference to Indian conditions have been made. Land use classification system based on physiography, utility, management and identification have been suggested using remote sensing techniques at different levels of mapping.  相似文献   

Multi level land use surveys using remote sensing techniques     

M. L. Manchanda  H. S. Iyer  B. M. Singh  Jitendra Prasad 《Journal of the Indian Society of Remote Sensing》1983,11(3):67-74

The use of Landsat imagery at 1:1 M and 1:250,000 and aerial photos on 1:65,000 and 1:20,000 scale have been used to study landuse. It has been possible to achieve identification using Landsat imagery up to utility level ( level 1 and II ) and with the aerial photographs further subdivisions of utility into management and identification (level III and IV) .  相似文献   

Numerical Simulation of Andhra Severe Cyclone (2003): Model Sensitivity to the Boundary Layer and Convection Parameterization   总被引：1，自引：0，他引：1  

C. V. Srinivas  R. Venkatesan  D. V. Bhaskar Rao  D. Hari Prasad 《Pure and Applied Geophysics》2007,164(8-9):1465-1487

The Andhra severe cyclonic storm (2003) is simulated to study its evolution, structure, intensity and movement using the Penn State/NCAR non-hydrostatic mesoscale atmospheric model MM5. The model is used with three interactive nested domains at 81, 27 and 9 km resolutions covering the Bay of Bengal and adjoining Indian Peninsula. The performance of the Planetary Boundary Layer (PBL) and convective parameterization on the simulated features of the cyclone is studied by conducting sensitivity experiments. Results indicate that while the boundary layer processes play a significant role in determining both the intensity and movement, the convective processes especially control the movement of the model storm. The Mellor-Yamada scheme is found to yield the most intensive cyclone. While the combination of Mellor-Yamada (MY) PBL and Kain-Fritsch 2 (KF2) convection schemes gives the most intensive storm, the MRF PBL with KF2 convection scheme produces the best simulation in terms of intensity and track. Results of the simulation with the combination of MRF scheme for PBL and KF2 for convection show the evolution and major features of a mature tropical storm. The model has very nearly simulated the intensity of the storm though slightly overpredicted. Simulated core vertical temperature structure, winds at different heights, vertical winds in and around the core, vorticity and divergence fields at the lower and upper levels—all support the characteristics of a mature storm. The model storm has moved towards the west of the observed track during the development phase although the location of the storm in the initial and final phases agreed with the observations. The simulated rainfall distribution associated with the storm agreed reasonably with observations.  相似文献   

Evaluation of the heavy metal pollution index for surface and spring water near a limestone mining area of the lower Himalayas   总被引：4，自引：1，他引：4  

B. Prasad  J. Bose 《Environmental Geology》2001,41(1-2):183-188

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Irrigation command area inventory and assessment of water requirement using IRS-1B satellite data     

V Hari Prasad  A K Chakraborti  T R Nayak 《Journal of the Indian Society of Remote Sensing》1996,24(2):85-96

Monitoring the crop acreage and irrigation water requirements vis-a-vis irrigation water supplies is important to obtain a realistic view of the “irrigation potential” and “potential utilised”. Satellite data provides information on crop area and thereby net irrigation water requirements of crops. A pilot study was taken up in Mahendragarh distributary canal in Haryana State to estimate net irrigation water requirement of crops under 17 minors for kharif and rabi seasons of 1992–93 period using IRS-1B satellite geocoded FCC images. These water requirements, when analysed with canal and tubewell water supplies for crops, show largescale deficiencies in the irrigation command area.  相似文献   

Historical geomorphology and pedology of the Gandak Megafan,Middle Gangetic Plains,India     

R. Mohindra  B. Parkash  J. Prasad 《地球表面变化过程与地形》1992,17(7):643-662

The Gandak megafan of eastern Uttar Pradesh and northwestern Bihar lies in the Middle Gangetic Plains. The Gandak River has shifted about 80 km to the east due to tilting in the last 5000 years. This has created a soil chronoassociation similar to the chronosequences found on some flights of river terraces. This chronoassociation has five members, QGD1-5. They are distinguished on the basis of profile development, clay mineralogy and calcium carbonate content. Chlorite transforms to vermiculite on a large scale from QGD1 to QGD3 and decreases drastically in member QGD4. Kaolinite and interstratified kaolinite-smectite are abundant in the older members of the chronoassociation. The youngest soils (QGD1:? < 500 b.p.) are found on the floodplains of the major rivers. QGD2 soils, like those of the Young Gandak Plain, date from? > 500 b.p., while QGD3 soils, like those on the Older Gandak Plain and Old Rapti Plains date back to 2500 b.p. QGD4 soils, like those on the Oldest Gandak Plain, are dated as? 5000 years b.p., whilst the oldest QGD5 soils, as on the Old Ghaghra Plain and Ganga-Ghaghra Interfluve, date back to 10000 b.p. These soils, which include pedogenic calcite and a? saline epipedon, indicate a dry climatic spell during the period 9000-11000 b.p. Faults developed on the megafan are not related to the basement structures.  相似文献   

Magneto-elastic waves and disturbances in initially stressed conducting media: II     

R. G. Roy  P. R. Sengupta 《Pure and Applied Geophysics》1972,101(1):54-66

Summary The paper is concerned with the investigation of the magneto-elastic waves and disturbances in initially stressed conducting media. Firstly, (a) the steady state response to moving loads in a magneto-elastic initially stressed conducting medium under an uniaxial tension has been discussed. Secondly, (b) the Lamb's problem corresponding to a line load suddenly applied in a magneto-elastic initially stressed conducting half-space bounded by a plane under uniaxial tension has been investigated. The final results obtained in both cases are in agreement with the corresponding classical problems when the initial tension is zero and the magnetic field is absent.  相似文献   

Boundary shock waves in a conducting gas     

B. G. Verma  Baleshwar Prasad 《Pure and Applied Geophysics》1971,87(1):203-209

Summary In this paper, we have postulated, in a conducting gas, the occurrence of a boundary shock wave, considered as a quick transition region in which the viscous effects are compressive and are confined to a thin layer adjacent to a surface. The analogues of the well known Rankine-Hugoniot jump relations, Prandtl relation, and other properties of a shock wave are derived and a discussion about the existence of a boundary shock wave is made.  相似文献   

Petrochemistry of the deccan trap flows of linga,Chhindwara district,M.P., India     

A. K. Prasad 《Bulletin of Volcanology》1971,35(4):1051-1068

Five representative cumulative samples of basal flows were chemically analysed. Normative composition (CIPW),DI, FI, MI, SI, f (norms) and ‘S’ indices have been calculated therefrom. It is concluded that the Linga flows are tholeiitic in nature with slightly more FeO, MgO and Al₂O₃ than most tholeiitic basalts. They represent eariy-middle stage basalts with DI less than 30. Thef-norms put these flows in the pyroxene field indicating an early fractionation of pyroxenes causing relative iron enrichment. Textural evidences, also, support a late fractionation of feldspar with overlapping periods of crystallisation of pyroxene and feldspar. The similarity in composition of the lower flows is more apparent than true. The trend of differentiation is characteristically tholeiitic. Oxygen and vapour fugacity may have been responsible for a shift in the general trend of differentiation. Explosive eruption of the magma, which was well mixed and which cooled rapidly, is borne by the features exhibited by these flows.  相似文献