Hydrodynamic Simulation of Flood wave using Dam Break Analysis in Hilly Terrain (Journal of Indian Association for Environment Management)
(Ritesh Vijay, Garima Jain Apurba Gupta,30,1,37-43, Year: 2003)
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A majority of river development projects forcing creation of a dam for hydroelectric generation, water supply, and/or recreational purposes warrants in-depth study on consequences of dam failure. The objective of this study is to assess the impact of such a catastrophic event due to the resulting surge wave in downstream of the dam. The study comprises hydrodynamic modeling of failure of a dam in hilly terrain using one dimensional dam break analysis to visualize a maximum credible failure (MCF) scenario due to 100-year return flood and breach formation. In this simulation, two bridges, confluences of two rivers and outflow from a powerhouse meeting in the downstream within the study area have also been considered. The simulation results include critical parameters like maximum flood discharges, maximum water levels and flood arrival time which are critical for the prediction of inundation in the downstream of the dam. The results may also be used to design protective measures to ensure the adequate security of the areas likely to be affected, as well as to develop flood warning system and emergency evacuation procedures.
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Identification and leaching characteristics of sludge generated from metal pickling and electroplating industries by Toxicity Characteristics Leaching Procedure (TCLP) (Environmental Monitoring and Assessment)
(Ritesh Vijay and T. A. Sihorwala,84,3,193-202, Year: 2003)
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One of India's major concerns is the increasing level of land pollution largely due to the uncontrolled disposal of industrialsolid and hazardous waste. With rapid industrialization, thegeneration of industrial solid and hazardous waste has increasedappreciably and the nature of waste generated has become complex.Their impacts on the ecological bodies are noticeable. The article describes the details of studies conducted using Toxicity Characteristics Leaching Procedure, to estimate the toxicity effects of the metals viz., chromium, zinc, manganese,iron, nickel, cobalt and copper by the Zero Headspace Extractorfor the sludges generated from effluent treatment plant of steeltube, wire and plating industries on environment constituentslike groundwater, surface water and land. Toxicity Characteristics Leaching Procedure determines the mobility of organic and inorganic analytes of liquid, solid or multiphase waste from hazardous solid wastes in the form of primary and secondary extracts. These extracts are mixed in equal volumeproportion and analyzed by Direct Reading 2000 spectrophotometer.The amount of heavy metals observed during the studies in theleachates were found and the results were compared with HazardousWaste categories as per Indian Standards, TCLP regulatory limitsgiven by United States Environment Protection Agency (USEPA) andGermany Leachate Quality Standards and it was observed that theywere on higher side, needing a proper preventive concept of sludge management including handling, treatment, recovery and disposal.
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Bioremediation of Soil Contaminated with Organic Compounds with special reference to Acrylonitirle (Annali di Chimica)
(Deshkar A, Dharmorikar N, Godbole S, Krishnamurthi K, Sarvanadevi S, Vijay Ritesh, Kaul S & Chakrabarti ,93,9-10,729-737, Year: 2003)
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Enrichment of acrylonitrile (AN) degrading bacterial culture from contaminated soil resulted in the isolation of two cultures which were identified as gram negative small rods (C1) and gram positive cocci (C2). One of the cultures (C1) was identified as Citrobacter fruendii on the basis of biochemical and physiological tests. Both the cultures (C1 and C2) were able to utilize acrylonitrile up to a concentration of 2000 mg/l as the sole source of carbon and nitrogen. The studies also confirmed that the acrylonitrile contaminated soil when ploughed with well mixed AN degrading culture, diammonium phosphate and farmyard manure, could be completely remediated within two months from the date of soil amendment.
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Aerosol Scavenging: Model Application and Sensitivity Analysis in the Indian Context (Environmental Monitoring and Assessment)
(S.Khan, V. Joseph,,,74, Year: 2002)
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Sulfate aerosols have been found to bethe major contributors to precipitation acidity. Thus,in view of the long-term ecological repercussions theyhave on aquatic ecosystems and their acidity-potential,the present analysis focuses on a case study applicationof the layer-averaged aerosol-scavenging model (Okita et al., 1996) for predicting values of the wet scavengingcoefficient and sulfate concentrations in precipitationsamples on the basis of the information available forsome selected Indian cities. Through sensitivityanalysis (Pandey et al., 1997) the scavengingcoefficient has been found to be very strongly dependenton precipitation intensity. Comparison of modelpredictions has been done with the measured values forDelhi, Mumbai, Calcutta and Chennai in India.
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TCLP studies for characterization of hazardous solid waste from pickling and electroplating industries and design aspects of secured land fill disposal, (Research Abstracts) (Journal of Indian Water Works Association)
(Ritesh Vijay,,,, Year: 1999)
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No information is available
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SENSITIVITY ANALYSIS OF A MANGROVE ECOSYSTEM MODEL (Journal of Environmental Systems)
(P. KHANNA
,,,26, Year: 1998)
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Mangrove ecosystems represent one of the most important ecosystems in terms of commercial use, inasmuch as their productivity is comparable to that of coral reefs and sea grass beds. In the present article, a comparative analysis is presented for delineating the ecological significance of mangrove ecosystems. Then, a mangrove ecosystem computer model is analyzed, and sensitivity analyses identify key parameters in the design of environmental management plans aimed at optimal and judicious use of mangroves. Analytical expressions are derived for steady state conditions. Moreover, conditions for ecological feasibility are also ascertained. Tidal action and nutrient inputs from terrestrial run-off turn out to be one of the most important controlling factors with respect to detritus export and nutrient cycling.
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SPEED-DEPENDENT MODELING OF ECOSYSTEM EXPOSURES FROM VEHICLES IN THE NEAR-ROAD ENVIRONMENT (Journal of Environmental Systems)
(P. KHANNA,,,21, Year: 1992)
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The article presents a model of automobile exhaust emissions in terms of vehicle speed and plant stomatal resistance. The software, which offers several advantages in environmental decision making, has been developed for computing gas—specific flux contributions and total daily ecosystems-health exposure-risk for a near road environment under strong wind con- ditions. Concentration differential has been taken as proportional to the emis- sion values from vehicles at different speeds. Flux contributions from different gaseous pollutants, and total daily exposure-risks have been com- puted as a function of vehicular speed and PAR-dependent curvature-coeffi- cient. The calibration and validation of the model will be cost effective, as the number of parameters included in the model is significantly lower than the number required in the conventional models.
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Geospatial analysis of groundwater quality in Patna Urban area. (Journal of Indian Water Works Association)
(Vijaya Laxmi,
Saurabh Sakhare
Ritesh Vijay
,Vol(2),Issue(2) Pages(104-110),,, Year: )
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No information is available
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GIS based solid waste management information system for Nagpur city, India (Journal of Environmental Science and Engineering)
(Ritesh Vijay, Preeti Jain, Nitu Sharma, J. K. Bhattacharya, A. N. Vaidya and R. A. Sohony,Vol(55),Issue(1),Pages(114-119),,, Year: )
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No information is available
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Hydraulic optimisation of secondary clarification (Water 21)
(Girish Pophali,,,, Year: )
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No information is available
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Photoelectro-peroxone process for the degradation of reactive azo dye in aqueous solution (Separation Science and Technology )
(Alphonsa C. Joy, R. Gandhimathi, S.V. Niveditha, S. T. Ramesh, P. V. Nidheesh,,,, Year: )
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This study evaluated the degradation of reactive yellow F3R (RY F3R) dye by photoelectro-peroxone (PEP) process. The study showed that the PEP gave 97.66% colour and 84.64% TOC removals at 1.176 h−1 which were 14 and 1.4 times greater than photolysis and electro-peroxone processes, respectively. Quenching experiment showed that hydroxyl radical and singlet oxygen were predominant oxidizing species in RY F3R degradation. In addition, results of the colour and TOC removal by the application of PEP to real field textile wastewater showed that PEP offer an efficient and propitious technology for organic pollutant degradation
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Managing future air quality in megacities: Emission inventory and scenario analysis for the Kolkata Metropolitan City, India (Atmospheric Environment)
(Dipanjali Majumdar,Pallav Purohit, Anil D. Bhanarkar, Padma S. Rao, Peter Rafaj, Markus Amann, Robert Sander, Ankita Pakrashi, Anjali Srivastava,222,,117-135, Year: )
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No information is available
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Hydrodynamic assessment of coastal aquifer against saltwater intrusion for city water supply of Puri, India (Environmental Earth Sciences)
(Ritesh Vijay , P. K. Mohapatra,75(7),,588, Year: )
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Puri city is situated on the east coast of India, and groundwater is the only source available to meet city water supply. Due to increase in population and urbanization of the city, groundwater withdrawal is continuously increasing, which may lead to the movement of saline water interface toward the fresh groundwater. Therefore, the objective of this study was to assess the hydrodynamics of groundwater flow and to predict withdrawal for future water demand of the city without affecting the saltwater intrusion. For this, a groundwater flow model was conceptualized and validated for the present withdrawal coupled with the saltwater intrusion model. To assess the safe yield of groundwater withdrawal, various iterations were carried out with different withdrawal rates and movement of fresh and saltwater interface. This helped in quantifying the future demand of city water supply without affecting the interface between fresh groundwater and saltwater. Based on the simulation results, various measures were suggested to safeguard the groundwater resource against saltwater intrusion.
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Object-based image analysis for the impact of sewage pollution in Malad creek, Mumbai, India (Environmental Monitoring and Assessment)
(Shivani Shirke, S. M. Pinto, Vikash K. Kushwaha, Trupti Mardikar, Ritesh Vijay ,188(2),,, Year: )
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Today, object-based image analysis provides an option for integrating spatial information beyond conventional pixel-based classifications for high-resolution imagery. Due to its rare applicability in pollution assessment, an attempt has been made to assess the spatial extent of sewage pollution in Malad Creek, Mumbai, India. Based on multiresolution segmentation of an IRS P6 (LISS IV) image and the Normalized Difference Turbidity Index (NDTI), the various water quality regions in the creek were classified. The existing literature implies that the reflectance of turbid water is similar to that of bare soil which gives positive NDTI values. In contrast to this, negative values of NDTI are observed in the present study due to the presence of organic matter which absorbs light and imparts turbidity, which is supported by the significant correlation between NDTI and turbidity. A strong relationship is observed between turbidity and water quality parameters, implying the impact of organic matter through discharges of sewage in the creek. Based on the classified regions and the water quality parameters, the extent of pollution was ranked as high, moderate, low and least. The methodology developed in the present study was successfully applied on an IKONOS image for the same study area but a different time frame. The approach will help in impact assessment of sewage pollution and its spatial extent in other water bodies.
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GIS based water quality indexing of Malad creek, Mumbai: an impact of sewage discharge (Journal of Environmental Science and Engineering)
(Ritesh Vijay, T. Bhattacharyya, R. Sharma, S. S. Dhage, R. A. Sohony,53,2,143-150, Year: )
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Malad creek is one of the most heavily polluted water bodies in Mumbai, India. Presently, creek receives wastewater and sewage from open drains and nallahs as well as partially treated wastewater from treatment facilities. The objective of the present study was to assess and classify the water quality zones spatially and temporally based on physico-chemical and bacteriological analysis. For this, GIS based methodology was integrated with water quality indexing, according to National Sanitation Foundation. Nine water quality parameters were considered to generate the indices that represent the overall status of creek water quality. Based on field observations and spatial distribution of water quality, various options were suggested for improvement in water quality of the creek.
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