CENTRE FOR EARTH SCIENCE STUDIES, KERALA
Development and Application of Shoreline Evolution Model for Shoreline
Southwest coast of India.
The coast of Kerala, in the first phase, which can be extended
to the Indian coasts later.
To develop, validate and implement models
to predict the short-term and long-term
To apply the model for a stretch of southwest
coast of India and develop its shoreline management plan.
Beach erosion can be a chronic, long-term shoreline retreat or a
short-term cyclic shoreline oscillation involving alternating erosion
and accretion. On many occasions, these short-term cyclic oscillations
can be of considerably large amplitudes, causing concern to the
safety of coastal properties and even human life. This pattern of
erosion/accretion attracts added importance in the case of Southwest
coast of India which is thickly populated and where a lot of developmental
activities are undertaken along the coast. Understanding the mechanism
and environmental conditions that cause shoreline changes and favour
different states of beaches is very important in coastal planning
Beach processes are controlled by wave characteristics and the resultant
nearshore circulation, sediment characteristics, beach form, etc.
These environmental conditions and other morphodynamic states vary
temporarily and spatially, while making it necessary to undertake
an in-depth and long-term study of the processes. The magnitude
of shoreline oscillations depends on the intensity and property
of wave activity and beach and sediment characteristics. The monsoon
waves cause major changes over beach and nearshore processes. The
different beach states are associated with varying beach and surf
zone topographies like longshore bar/trough, beach cusps and other
rhythmic topographic features. Hence, developing predictive models
is very important for sustainable shoreline management.
Thus, this project envisages the development of a mathematical model
to predict the shoreline change in different time scales – (a) shoreline
resulting from an event like a storm (short-term) and (b) cumulative
changes occurring yearly (long-term). Finally, the model shall be
demonstrated for its functionality and effectiveness at suitable
location(s). The proposed study is the first attempt in this direction
in the country.
There are different numerical models available to predict the shoreline
changes with applicability of each one to the selected locations.
It is intended to validate the models to assess the suitability
of them to the southwest coast of India. If appropriate models are
available, it is intended to modify/improve them to suit to the
locations of interest. If none are available, then remodel afresh
by incorporating the adequate parameters based on field observations
and to propose a model suited for the coast. To enable the task
the following activities are planned:
(i) Beach profile and other littoral environmental observations
for different locations.
(ii) Wave and current recording at the above locations using ADCP.
(iii) Model validation and fine tuning.
(iv) Preparation of shoreline management plan for a site.
The development of the shoreline change model is in progress.
The available shoreline change models are
being evaluated using secondary data.
The wave and sediment data collected by CESS
together with other secondary data is utilized in this process.
Beach profile measurements are being carried
out for two locations.
- Measurement of waves and currents using ADCP is envisaged.
Date of project completion:
It is expected to complete the project by the
Total Cost of Project: Rs.
29, 25, 000/-
Dr. T. S. Shahul Hameed
Centre for Earth Science Studies
Trivandrum – 695 031