GIS based spatial distribution mapping and suitability evaluation of groundwater quality for domestic and agricultural purpose in Kaithal district, Haryana state, India   总被引：1，自引：0，他引：1  

Sanjay Kumar Goyal  B. S. Chaudhary  Omvir Singh  G. K. Sethi  Praveen K. Thakur 《Environmental Earth Sciences》2010,61(8):1587-1597

Groundwater is a major resource for meeting huge domestic and agricultural requirements of Kaithal district in Haryana. Therefore, evaluation of its quality in terms of suitability for domestic and agricultural sectors is necessary for sustainable management of the resource. The present study has analyzed pre- and post-monsoon physico-chemical data of groundwater samples from bore wells spread over the entire district. Spatial distribution maps were generated for hydrogen ion concentration, total dissolved solids, total hardness, electrical conductivity, sodium adsorption ratio, residual sodium carbonate and percent sodium using the geographic information system. Furthermore, the study area was demarcated into different groundwater quality zones for domestic and agricultural use by applying various national and international standards. It was observed from the study that the groundwater was predominantly hard, alkaline and saline in nature. However, it was within safe limits for domestic use. Further, it was also experienced from the analysis that in about two-third parts of the district, groundwater was in desirable-to-permissible quality class for agricultural use but hazardous for soil as well as for crops in the remaining part. Also, a moderation in water quality was observed after the monsoon season, which can be attributed to a possible dilution due to groundwater recharge.  相似文献   

尼泊尔Andhi Khola河研究参照点的识别及确认（英文）     

Praveen SHARMA  Subodh SHARMA  Smriti GURUNG 《资源与生态学报(英文版)》2015,6(1):30-36

参照条件是开展河流生态学研究的基础,这些条件不受或很少受到人为干扰。为研究尼泊尔Andhi Khola河上一处河坝的生态影响,采用野外快速生物筛分(RFB)法预先划分出2个研究参照点或最少干扰参照点,于2013年1月和2月采集了生物学样品(大型脊椎动物)和物理-化学样品。对大型无脊椎动物区系使用多栖息地采样(MHS)法。通过一些指标对预选的研究点进行了确认,这些指标是:尼泊尔生物评价法(NEPBIOS)、生物监测评价法(BMWP)、兴都库什喜马拉雅生物评价法(HKHBIOS)、Hilsenhoff法(HILSENHOFF),以及国家卫生基金会水质指标法(NSFWQI)。NEPBIOS、HKHBIOS、HILSENHOFF、RFB以及NSFWQI指标预测2个参照点的河水水质都比较好,达到II级水准。只有BMWP/ASPT水质指标预测2个参照点的河水水质都很好,达到I级水准。如此,预选的这2个水质较好的点(II级)被确认为研究参照点。本研究表明,多度量法适用于即将修建水利工程的河流的监测与评价。  相似文献   

Characterization of low latitude GPS-TEC during very low solar activity phase     

Praveen Galav  N. Dashora  S. Sharma  R. Pandey 《Journal of Atmospheric and Solar》2010,72(17):1309-1317

We present the mean diurnal, seasonal and annual variations in TEC during the lowest solar activity phase from low latitude Indian zone recorded at Udaipur (Geog. Lat. 24.6°N, Geog. Long.73.7°E, Geomag. Lat. 15.6°N) using a GPS receiver. Seasonal variations in daytime TEC show a semiannual periodicity, with a minimum in winter. Results of seasonal variations have been compared with that of the IRI-2007 model. Model calculations reveal significant seasonal as well as longitudinal differences in TEC. Seasonal variations in the nighttime TEC reveal an annual periodicity. Near the crest of the EIA, TEC shows a very good correlation with the solar flux. The results also point to weakening of the anomaly crest as well as its spatial and temporal contraction with declining solar activity.  相似文献   

α2 CVn: A comparison between spot and oblate spheroid models     

Praveen Nagar  K. D. Abhyankar 《Journal of Astrophysics and Astronomy》1988,9(3):173-183

A comparison is made between a hot-spot model and a recently proposed oblate spheroid model (Böhm-Vitense & Van Dyk 1987) to explain the spectroscopic and photometric variations of α² CVn. It is found that the spot model gives a better fit to the spectroscopic and photometric variations. The spot model requires five high temperature circular patches over the surface of the star. The positions of these patches agree well with those derived spectroscopically by Pyper (1969).  相似文献   

Quantitative assessment of sustainability of proposed watershed development plans for kharod watershed,western India     

Arun?Kumar?SharmaEmail author  Praveen?Kumar?Thakur 《Journal of the Indian Society of Remote Sensing》2007,35(3):231-241

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Observational perspective of SST changes during life cycle of tropical cyclones over Bay of Bengal     

Pothapakula  Praveen Kumar  Osuri  Krishna K.  Pattanayak  Sujata  Mohanty  U. C.  Sil  Sourav  Nadimpalli  Raghu 《Natural Hazards》2017,88(3):1769-1787

Natural Hazards - Sea surface temperature (SST) plays a significant role in tropical cyclone (TC) formation and intensity evolution, while at the same time, TC induces SST changes during its life...  相似文献   

Hydrogeomorphological differentiation between floodplains and terraces          下载免费PDF全文

Qina Yan  Toshiki Iwasaki  Andrew Stumpf  Patrick Belmont  Gary Parker  Praveen Kumar 《地球表面变化过程与地形》2018,43(1):218-228

Floodplains and terraces in river valleys play important roles in the transport dynamics of water and sediment. While flat areas in river valleys can be identified from LiDAR data, directly characterizing them as either floodplain or terraces is not yet possible. To address this challenge, we hypothesize that, since geomorphic features are strongly coupled to hydrological and hydraulic dynamics and their associated variability, there exists a return frequency, or possibly a narrow band of return frequencies, of flow that is associated with floodplain formation; and this association can provide a distinctive signature for distinguishing them from terraces. Based on this hypothesis we develop a novel approach for distinguishing between floodplains and terraces that involves transforming the transverse cross‐sectional geometry of a river valley into a curve, named a river valley hypsometric (RVH) curve, and linking hydraulic inundation frequency with the features of this curve. Our approach establishes that the demarcation between floodplains and terraces can be established from the structure of steps and risers in the RVH curves which can be obtained from the DEM data. Further, it shows that these transitions may themselves be shaped by floods with 10‐ to 100‐year recurrence. We additionally show that, when floodplain width and height (above channel bottom) are normalized by bankfull width and depth, the ratio lies in a narrow range independent of the scale of the river valley. Copyright © 2017 John Wiley & Sons, Ltd.  相似文献   

Long-term ultraviolet variability of Seyfert galaxies     

N. Sukanya  C. S. Stalin  P. Joseph  S. Rakshit  D. Praveen  R. Damle 《Journal of Astrophysics and Astronomy》2018,39(6):65

Flux variability is one of the defining characteristics of Seyfert galaxies, a class of active galactic nuclei (AGN). Although these variations are observed over a wide range of wavelengths, results on their flux variability characteristics in the ultraviolet (UV) band are very limited. We present here the long-term UV flux variability characteristics of a sample of fourteen Seyfert galaxies using data from the International Ultraviolet Explorer acquired between 1978 and 1995. We found that all the sources showed flux variations with no statistically significant differences in the amplitude of UV flux variation between shorter and longer wavelengths. Also, the flux variations between different near-UV (NUV, \(1850{-}3300\) Å) and far-UV (FUV, \(1150{-}2000\) Å) passbands in the rest frames of the objects are correlated with no time lag. The data show indications of (i) a mild negative correlation of UV variability with bolometric luminosity and (ii) weak positive correlation between UV variability and black hole mass. At FUV, about 50% of the sources show a strong correlation between spectral indices and flux variations with a hardening when brightening behaviour, while for the remaining sources the correlation is moderate. In NUV, the sources do show a harder spectrum when brighter, but the correlation is either weak or moderate.  相似文献   

GIS-based evaluation of micro-watersheds to ascertain site suitability for water conservation structures     

Praveen G. Saptarshi  Rao Kumar Raghavendra 《Journal of the Indian Society of Remote Sensing》2009,37(4):693-704

The planning of conservation measures to conserve water and soil resources taking hydrological planning unit as micro-watershed is considered to be effective. The automated watershed delineation technique using the spline interpolated filled digital elevation model (DEM) is effective in converging slopes of the area in which the stream patterns match with the manually digitized stream patterns of the topographical map. The various vector spatial layers like the slope/aspect, land-use/land-cover, runoff potential, soil erosion potential and the associated attribute information governing the criteria for different conservation structures can act as input layers in integrated spatial analysis module in GIS environment to evolve derived layers indicating the locations of conservation sites meeting the requisite criteria. The reliability of suitable conservation sites suggested out of integrated spatial GIS analysis could be ascertained using the multi criteria analysis incorporating the various factors controlling soil erosion process in the micro-watershed groups. The details of the above work are discussed in the paper.  相似文献