Adding our leaves: A community-wide perspective on research directions in ecohydrology     

Christina L. Tague  Shirley A. Papuga  Cynthia Gerlein-Safdi  Salli Dymond  Ryan R. Morrison  Elizabeth W. Boyer  Diego Riveros-Iregui  Elizabeth Agee  Bhavna Arora  Yannis G. Dialynas  Amy Hansen  Stefan Krause  Sylvain Kuppel  Steven P Loheide II  Stanislaus J. Schymanski  Samuel C Zipper 《水文研究》2020,34(7):1665-1673

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Impact of seismic factors on landslide susceptibility zonation: a case study in part of Indian Himalayas   总被引：6，自引：0，他引：6  

Naveen Pareek  Mukat L. Sharma  Manoj K. Arora 《Landslides》2010,7(2):191-201

Landslides are one of the most widespread natural hazards in high mountain terrains such as the Himalayas, which are one of the youngest tectonically and seismically active mountain ranges in the world. The crustal movements along the longitudinal thrusts and transverse faults give rise to earthquakes and in turn initiate landslides in the region. In fact, in addition to various static factors causing landslides, earthquakes are one of the major causes of landslides. It is thus imperative to incorporate seismic factor also while carrying out landslide susceptibility zonation map preparation in a seismically active areas like Garhwal Himalayas. In this paper, a study on the effect of earthquakes on landslide susceptibility zonation has been demonstrated by taking Chamoli earthquake as an example.  相似文献   

Relative performance of different triangular networks in locating regional seismic sources     

Arora  S K  Varghese  T G  Basu  T K 《Journal of Earth System Science》1978,87(11):271-281

Journal of Earth System Science - In regional seismic surveys use of small semipermanent networks of detectors is often made. This study aims at investigating qualitatively the location capability...  相似文献   

On the universal time component in the daily variation of the geomagnetic disturbance field     

B. R. Arora 《Pure and Applied Geophysics》1974,112(2):456-463

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Dispersion-flocculation studies on hematite-clay systems     

B. Gururaj  J.P. Sharma  A. Baldawa  S.C.D. Arora  N. Prasad  A.K. Biswas 《International Journal of Mineral Processing》1983,11(4):285-302

Studies have been made on the separability of clay minerals such as kaolinite, illite and montmorillonite from hematite in dispersant-starch flocculant systems. The grossly different dispersibility of hematite from that of clay minerals aided separation by selective dispersion and flocculation. Moderate success has been achieved with a selectivity index nearing 4.0 (average recovery values around 80%).The studies have been extended to hematite recovery and clay rejection from the slimes of the Barsua iron ore washing plant owned by Rourkela Steel Plant, India. Limited success achieved in the starch selective flocculation method has been attributed to the difficulties associated with fine grain size, clay mineraloty and liberation.The ore exhibits the phenomenon of differential grinding. Hematite-rich coarser particles in the slime can be separated by differential settling in dispersant systems followed by selective flocculation in low-starch systems.  相似文献   

Analytical representation of spatial and temporal variations of the geomagnetic field in the Indian region     

B R Arora  V H Badshah  B P Singh  M G Arur  P S Bains  Jeevan Lal 《Journal of Earth System Science》1983,92(1):15-30

The magnetic measurements of declination (D), horizontal (H) and vertical (Z) components of earth’s magnetic field, collected from ground surveys between 1962 and 1966, are used to develop an analytical model of geomagnetic field variations over Indian region for the epoch 1965. In order to reflect spatial features with wavelengths of approximately 1000 km, sixth degree polynomial as a function of differential latitude and longitude is calculated by the method of least squares. The root mean square fit of the model to the input data is better than that accounted by the International Geomagnetic Reference Field for 1965.0. Isomagnetic charts drawn forD, H, Z and total force (F) reflect more details than that shown on world magnetic charts. Further, the values of the field at common repeat stations recorded between 1962 and 1974, after eliminating the field values for the epoch 1965.0, are used to get the secular variation as well as its spatial dependence again by means of polynomial which now includes coefficients which are functions of time and of geographical locations. The accuracy of coefficients is tested against the behaviour of secular variation at permanent magnetic observatories. The merits and limitations of the model are discussed.  相似文献   

An approach for GIS-based statistical landslide susceptibility zonation—with a case study in the Himalayas   总被引：14，自引：1，他引：14  

Ashis K. Saha  Ravi P. Gupta  Irene Sarkar  Manoj K. Arora  Elmar Csaplovics 《Landslides》2005,2(1):61-69

Landslide susceptibility zonation (LSZ) is necessary for disaster management and planning development activities in mountainous regions. A number of methods, viz. landslide distribution, qualitative, statistical and distribution-free analyses have been used for the LSZ studies and they are again briefly reviewed here. In this work, two methods, the Information Value (InfoVal) and the Landslide Nominal Susceptibility Factor (LNSF) methods that are based on bivariate statistical analysis have been applied for LSZ mapping in a part of the Himalayas. Relevant thematic maps representing various factors (e.g., slope, aspect, relative relief, lithology, buffer zones along thrusts, faults and lineaments, drainage density and landcover) that are related to landslide activity, have been generated using remote sensing and GIS techniques. The LSZ derived from the LNSF method, has been compared with that produced from the InfoVal method and the result shows a more realistic LSZ map from the LNSF method which appears to conform to the heterogeneity of the terrain.  相似文献   

On the method of maximum likelihood estimation for the log-Pearson type 3 distribution     

K. Arora  V. P. Singh 《Stochastic Hydrology and Hydraulics》1988,2(2):155-160

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On the method of maximum likelihood estimation for the log-Pearson type 3 distribution     

K. Arora  V. P. Singh 《Stochastic Environmental Research and Risk Assessment (SERRA)》1988,2(2):155-160

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A seismic event on August 20, 1983: double explosion or a single earthquake     

S. K. Arora  T. K. Basu 《Physics of the Earth and Planetary Interiors》1985,40(4):309-315

An interesting weak seismic event occurred on August 20, 1983 in the Caspian Sea region in southwestern U.S.S.R., which produced at Gauribidanur array two distinct seismic signals, viz. the leading P signal and a similar signal after an interval of nearly 12 s. Preliminary data corresponding to these two signals led to an initial assumption that the event was a double underground nuclear explosion. However, the focal depth of this event from P arrival-time data of 21 stations was found to be 45 km. Further processing of the Gauribidanur array seismograms confirmed that the second signal, detected exactly 11.85 s after the first arrival, was none other than the surface-reflected P pulse which lent excellent support to the source depth estimate. By using three discriminants, viz. signal complexity, third moment of frequency and relative efficiency of generation of core-reflected P, the event was objectively compared with 10 small presumed underground nuclear explosions in southwestern U.S.S.R. to conclude that the August 20, 1983 event was a shallow-focus small earthquake in the Caspian Sea area.  相似文献