Leena,P; Dr.Babu, C A(Department of Atmospheric Science, 2000)
[+]
[-]
Abstract:
The objective of the study is to examine the dynamic and thermodynamic structure and the variations that occur in the surface layer during the pre-monsoon, onset and post-monsoon periods over the Indian region. The variations caused during the occurrence of micro and mesoscale systems, structure and variation in the marine boundary layer over the Indian region is also investigated. The drag coefficient computed indirectly also shows variation during various seasons. The thermodynamic structure of the atmosphere shows variation during the various seasons. The onset monsoon causes lowering of the Lifting Condensation Levels. The outcome of the study is expected to provide a better understanding of the structure and variations in the boundary layer over India, which is useful for many applications especially for numerical modeling studies.
Hamza, Varikoden; Dr.Babu, C A(Department of Atmospheric Science, May , 2006)
[+]
[-]
Abstract:
Atmospheric Boundary layer (ABL) is the layer just above the earth surface and is influenced by the surface forcing within a short period of an hour or less. In this thesis, characteristics of the boundary layer over ocean, coastal and inland areas of the atmosphere, especially over the monsoon regime are thoroughly studied. The study of the coastal zone is important due to its high vulnerability mainly due to sea breeze circulation and associated changes in the atmospheric boundary layer. The major scientific problems addressed in this thesis are diurnal and seasonal variation of coastal meteorological properties, the characteristic difference in the ABL during active and weak monsoons, features of ABL over marine environment and the variation of the boundary layer structure over an inland station.
The thesis describes the various features in the ABL associated with the active and weak monsoons and, the surface boundary layer properties associated with the active and weak epochs. The study provides knowledge on MABL and can be used as the estimated values of boundary layer parameters over the marine atmosphere and to know the values and variabilities of the ABL parameters such as surface wind, surface friction, drag coefficient, wind stress and wind stress curl.
Joseph, P V; Jacob,Chacko(Department of Chemical Oceanography, 2002)
[+]
[-]
Abstract:
The proposed study is an attempt to quantify and study the seasonal and spatial variations in the distribution of Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd and Pb among the various geochemical phases in the surficial sediments of Chitrapuzha river. The study also estimates the concentration of heavy metals in dissolved, particulate and sediments and their variation in seasonal and spatial distribution. Chitrapuzha River originates as a small stream from the upper reaches of high ranges in the eastern boundary of Kerala, passes through the valley and finally joints in the Cochin backwaters. Numerous industrial units located along the banks of the river discharge treated and untreated effluents into the water. These are long standing local complaints about water pollution causing fish mortality and serious damage to agricultural crops resulting in extensive unemployment in the area. The river is thus of considerable social and economic importance.
Sabu,P; Dr.Revichandran,C(Cochin University of Science & Technology, January , 2009)
[+]
[-]
Abstract:
The present study
examines the importance of low saline waters and resulting barrier layer
in the dynamics of the ASWP using observational data.The oceanic general circulation models (OGCM) are very useful for
exploring the processes responsible for the ASWP and their variability.
The circulation and thermohaline structure stimulated by an OGCM
changes a lot when the resolution is increased from mesoscale to macro
scale. For a reasonable simulation of the ASWP, we must include the
mesoscale turbulence in numerical models. Especially the SEAS is an
eddy prominent region with a horizontal dimension of 100 to 500 km and
vertical extent of hundred meters. These eddies may have an important
role on the evolution of ASWP, which has not been explored so far.Most of the earlier studies in the SEAS showed that the heat buildup
in the mixed layer during the pre-monsoon (March-May) is primarily
driven by the surface heat flux through the ocean-atmosphere interface,
while the 3-dimensional heat budget of the ML physical processes that are
responsible for the formation of the ASWP are unknown. With this
background the present thesis also examines the relative importance of
mixed layer processes that lead to the formation of warm pool in the
SEAS.
Philip, Thomas; Dr.Meera Bai,M(Cochin University of Science and Technology, May , 1996)
[+]
[-]
Abstract:
The following objectives have been formulated for
the study.
To assess the procurement and marketing practices of
Non—Timber Forest Produce by tribes and Tribal
Co-operative Societies and examine the role of
co—operatives in liberating the tribes from the clutches
of private traders.
To study the relative efficiency of marketing channels.
To analyse the inter—difference between tribes and
regions in the collection and marketing of Non—Timber
Forest produce.
To examine the forward linkage of tribal co-operative
societies with the Ayurvedic Medicinal Manufacturing
Units of the state.
To examine the impact of marketing on employment and
income of tribes and
To examine the extent of involvement of tribes in Tribal
Co-operative Societies in policy formulation and
implementation.
Description:
Department of Applied Economics.
Cochin University of Science and Technology
Haseena, V A; Dr.Meera Bai,M(Cochin University of Science and Technology, September 9, 2006)
[+]
[-]
Abstract:
This thesis Entitled Dynamics of deforestation and Socio-Economic profile of tribal women flok in kerala -A study of Attappady. The study was based on both primary and secondary data. Primary data
were collected through a sample survey conducted in three panchayaths .The thesis is organized in eight chapters. The first chapter provides the background to the study. Second chapter reviews the literature. Third chapter provides the profile of the study area and general conditions. Fourth chapter
consists of the life cycle structure of the tribal woman. Fifth chapter covers the socio-economic conditions of the tribal women in the study area. Sixth chapter consists of relationship between tribal women and forest and the degradation of the forest. Seventh chapter provides the documentation of the development programmes implemented in Attappady and their importance to the tribals. Last chapter consists of summary and conclusions of the study, suggestions and recommendations of the study.
Description:
Department of Applied Economics, Cochin University of Science and Technology
Jayaraj,K A; Saramma,U Pananpunnayil(National institute of oceanography, 2006)
[+]
[-]
Abstract:
In this study dynamics of infaunal benthic community of the continental shelf of north-eastern Arabian sea. The benthic (under water sea) organisms play an important role in the marine food chain. It can be concluded that seasonal differences in the benthic community was observed in lower depths and absent in deeper depths. Increased richness and diversity during pre-monsoon may be related to the increased primary production which inturn influenced by the increased nutrient input due to winter convection. No single ecological factor could be considered as a master factor. In general the area supports moderately high benthic production and diversified community.
Sanathanan,Velluva; Muraleedharan,P K; Mary,Joseph(Kerala Forest Research Institute& Department of Applied Economics, 1999)
[+]
[-]
Abstract:
The present study on the dynamics of land use in recently settled forest areas. In the course of events, tribals lost their land; the demographic structure of Attappady changed; the cropping pattern got diversified; traditional techniques of production were ruined; new crops and new techniques of cultivation came to stay; and the entire cost and return structure of production underwent radical change. Migration to Attappady is essentially a continuation of the Malabar migration process from Travancore, through, some people from Tamil Nadu also had migrated to this region earlier. The demographic structure, along with land structure, has changed in favour of the settlers within a short span of time. Lack of security of ownership has acted as a strong reason for wanton exploitation of land resources. The major influencing factors on crop choices among settlers were labour endowment, date of settlement and education. Attappady is an unique ecosystem in Kerala characterized by many interdependables. The latest hand of environmental degradation is a grave danger especially on sloppy terrains,which are under cultivation of tapioca and dry annual crops like groundnuts, cotton, grams etc. Soil erosion as a result of the unplanned cultivation of these crops has resulted in dramatic decline in soil fertility and hence low crop productivity. This calls for a watershed management approach for the sustainable development of the region. A progressive agrarian transformation is warranted to maintain the homegarden as a sustainable production system in ecological and socio-economic terms.
Babu, V; Dr.Muraleedharan Nair, S(Cochin University Of Science And Technology, June , 2001)
[+]
[-]
Abstract:
The tremendous growth in industrial production and the consequent
improving in the standards of living have provoked worldwide discussion on
environmental quality. The question of abusive use of pesticides for crop protection
and vector control programmes is only one aspect of this entire complex. Inspite of
this, tendentious publications such as Rachel Carson’s Silent spring have brought
crop protection into the foreground of environmental discussions. The persistence
and high stability of organochlorine pesticides are regarded as problematic and the
accumulation of pesticides residues and its metabolites in the different
compartments of the environment is one of the major concerns. Because of their
persistence in the aquatic environment and biomagnifications in food chain, the
continuous use of pesticides will have wider implications not only in aquatic
environmental quality but also on human health. The residual levels of these
persistent chemicals exceed their permissible limits, and get partitioned among the
constituent phases of the aquatic systems. Crop protection is only part of the
agricultural economy and in agriculture itself has led to the most fundamental
changes in the human environment. So, in all areas of life one must weigh the
desired advantages against possible disadvantages.
The proposed thesis is based on the investigations on the distributions of
organochlorine and organophosphorus pesticides in the waters and sediments of
Kuttanad backwaters. Kuttanad, a unique agricultural area, which forms the
southern part of the Vembanad lake, is a deltaic formation of four river systems
entering the southern part of the Cochin estuary. No systematic study has ever been
done to assess the ecotoxicological impact of these diverse chemicals and their
metabolites in Kuttanad area. So, a detailed systematic and rigorous investigation
on the distributions of these persistent chemicals is carried out.
The thesis is divided into 7 Chapters
Description:
Department of Chemical
Oceanography, School of Marine Sciences, Cochin University of Science and
Technology
Sujatha, C H; Dr.Jacob, Chacko(Cochin University of Science and Technology, July , 1992)
[+]
[-]
Abstract:
Industrial pollutants, consisting of heavy metals, petroleum residues, petrochemicals, and a wide spectrum of pesticides, enter the marine environment on a massive scale and pose a very serious threat to all forms of aquatic life. Although, earlier, efforts were directed towards the identification of pollutants and their major sources, because of a growing apprehension about the potential harm that pesticides can inflict upon various aquatic fauna and flora, research on fundamental and applied aspects of pesticides in the aquatic environment has mushroomed to a point where it has become difficult to even keep track of the current advances and developments. The Cochin Estuarine System (CES), adjoining the Greater Cochin area, receives considerable amounts of domestic sewage, urban wastes, agricultural runoff as well as effluent from the
industrial units spread all along its shores. Since preliminary investigations revealed that the most prominent of organic pollutants discharged to these estuarine waters were the pesticides, the present study was designed to analyse the temporal and spatial distribution profile of some of the more toxic, persistent pesticides ——— organochlorines such as DDT and their metabolites; HCH-isomers; a cyclodiene compound," Endosulfan and a widely distributed, easily degradable,
organophosphorus compound, Malathion, besides investigating their sorptional and toxicological characteristics.
Although, there were indications of widespread contamination of various regions of the CBS with DDT, HCH-isomers etc., due to inadequacies of the monitoring programmes and due to a glaring void of baseline data the causative factors could not identified authentically. Therefore, seasonal and spatial distributions of some of the more commonly used pesticides in the CES were monitored systematically, (employing Gas Chromatographic techniques) and the results are analysed.
Description:
Chemical
Oceanography Division, School of Marine Sciences, Cochin University
of Science and Technology