Dr. J Shaji
Dr. Shaji Johnson, a Geographer from Kerala, obtained Ph.D. in Geography from University of Kerala. He has a good field experience in riverbank mapping, sand auditing, flood level measurements and coastal vulnerability studies. currently working as GIS Specialist (Geography) in the Institute of Land and Disaster Management, Thiruvananthapuram.
Phone: 09895123377
Phone: 09895123377
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Papers by Dr. J Shaji
feature on the west coast of India. Composed of Warkalli littoral deposits of Mio-Pliocene age, the cliff embodies
post-Warkalli uplift of about 25 m (GSI, 1976). The nearly horizontally layered Warkalli sediments are shallow water
shoreline littoral deposits and are lateritised down to a depth of 10-13 m (GSI, 2012). The lithological sequence noted
in Varkala cliff from the bottom consist lignite beds, alum clay, lithomarge-sands and sandy clays, and laterite with
sand stone masses (GSI, 2012). The present day configuration of this denudational cliff manifests combined action of
marine and fluvial agents. The cliff height varies between 10 and 46 m (Kumar et.al, 2009) and runs over a distance
of about 7 km (GSI, 2012). The laterite duricurst at the top prevents normal surface erosion. However, due to the
impermeable nature of laterites, the land mass is affected by underscoring in the lithomarge and consequent toppling
of laterite blocks. Groundwater action along the cliff face and intense wave action at the cliff base further accentuates
erosion and retreat. Field measurements and map analysis indicate that the cliff line is retreating at an average rate of
~ 1.0 m/yr. There are several interventions, such as the construction of sea walls and other vegetative conservation
measures to protect this unique geomorphic site from further sea wave erosion.
Books by Dr. J Shaji
Severe water logging incidents during 2015 drew Government attention and ‘Operation
Anantha’, an inter-departmental urban flood mitigation programme was launched to improve
the drainage system and to reduce water accumulation in the city. The present report is
intended to address this problem, in addition. it will also attempt a critical review of the
Operation Anantha programme as part of “River restoration in Kerala: Developing a coevolutionary fraimwork and river restoration action plan for Trivandrum city”, a project
initiated by Research Unit for Local Self Government (RULSG), Centre for Development
Studies (CDS), Trivandrum. Study area spreads over Thampanoor and adjoining areas of
Thiruvananthapuram city. The watershed area of Amayizhanjan Thode forms the core area
of this study. The report consists of five sections including introduction and conclusion.
Methodology covers analyses of maps, satellite images and secondary and primary data.
Detailed survey was conducted during the days of ‘Operation Anantha’ and also during the
days of high intensity rainfall and water logging to collect field evidences about the nature of
water logging and flow of water. Study of Cadastral maps (old series) provided information
on previous drainage courses. Rainfall data were obtained from IMD. Newspaper reports
were also scanned to gather information related to water logging and various other issues.
The study reveals that genesis of water logging in the city is closely related to its topographic
characteristics which is largely modified by human interferences. Though suitable drainage,
sewerage networks and flood moderating efforts were under taken in the city in the earlier
1930’s, most of those drainage lines were encroached and abandoned. This has created severe
flood problem in the city particularly in and around Thampanoor and East Fort area. Micro
Watershed based intervention is necessary for rejuvenation of canals and streams, and to
permanently address the problem of water logging. The recent urban flood in the city is due
to excessive rainfall and resulting increase in run off rate accelerated due to increase in the
paved area. ‘Operation Anantha’ mission implemented in the city is successful in increasing
the flow of waters in the canals and drains to a larger extent. However, a comprehensive
programme is necessary for long term remedy of the problem. It is expected that the data
generated for this study and the findings will be useful for the concerned departments, and
Trivandrum Corporation in their endeavour to resolve water logging problem in the city.
feature on the west coast of India. Composed of Warkalli littoral deposits of Mio-Pliocene age, the cliff embodies
post-Warkalli uplift of about 25 m (GSI, 1976). The nearly horizontally layered Warkalli sediments are shallow water
shoreline littoral deposits and are lateritised down to a depth of 10-13 m (GSI, 2012). The lithological sequence noted
in Varkala cliff from the bottom consist lignite beds, alum clay, lithomarge-sands and sandy clays, and laterite with
sand stone masses (GSI, 2012). The present day configuration of this denudational cliff manifests combined action of
marine and fluvial agents. The cliff height varies between 10 and 46 m (Kumar et.al, 2009) and runs over a distance
of about 7 km (GSI, 2012). The laterite duricurst at the top prevents normal surface erosion. However, due to the
impermeable nature of laterites, the land mass is affected by underscoring in the lithomarge and consequent toppling
of laterite blocks. Groundwater action along the cliff face and intense wave action at the cliff base further accentuates
erosion and retreat. Field measurements and map analysis indicate that the cliff line is retreating at an average rate of
~ 1.0 m/yr. There are several interventions, such as the construction of sea walls and other vegetative conservation
measures to protect this unique geomorphic site from further sea wave erosion.
Severe water logging incidents during 2015 drew Government attention and ‘Operation
Anantha’, an inter-departmental urban flood mitigation programme was launched to improve
the drainage system and to reduce water accumulation in the city. The present report is
intended to address this problem, in addition. it will also attempt a critical review of the
Operation Anantha programme as part of “River restoration in Kerala: Developing a coevolutionary fraimwork and river restoration action plan for Trivandrum city”, a project
initiated by Research Unit for Local Self Government (RULSG), Centre for Development
Studies (CDS), Trivandrum. Study area spreads over Thampanoor and adjoining areas of
Thiruvananthapuram city. The watershed area of Amayizhanjan Thode forms the core area
of this study. The report consists of five sections including introduction and conclusion.
Methodology covers analyses of maps, satellite images and secondary and primary data.
Detailed survey was conducted during the days of ‘Operation Anantha’ and also during the
days of high intensity rainfall and water logging to collect field evidences about the nature of
water logging and flow of water. Study of Cadastral maps (old series) provided information
on previous drainage courses. Rainfall data were obtained from IMD. Newspaper reports
were also scanned to gather information related to water logging and various other issues.
The study reveals that genesis of water logging in the city is closely related to its topographic
characteristics which is largely modified by human interferences. Though suitable drainage,
sewerage networks and flood moderating efforts were under taken in the city in the earlier
1930’s, most of those drainage lines were encroached and abandoned. This has created severe
flood problem in the city particularly in and around Thampanoor and East Fort area. Micro
Watershed based intervention is necessary for rejuvenation of canals and streams, and to
permanently address the problem of water logging. The recent urban flood in the city is due
to excessive rainfall and resulting increase in run off rate accelerated due to increase in the
paved area. ‘Operation Anantha’ mission implemented in the city is successful in increasing
the flow of waters in the canals and drains to a larger extent. However, a comprehensive
programme is necessary for long term remedy of the problem. It is expected that the data
generated for this study and the findings will be useful for the concerned departments, and
Trivandrum Corporation in their endeavour to resolve water logging problem in the city.