Preliminary evaluation of photogrammetric-Remote Sensing approach in monitoring shoreline erosion
Mazian Hashim, Dr. Aziz Ibrahim and Adeli Abdullah
university of technology malaysia
locked bag 791, 80990 johor bahru
Malyasia
Tel (07)-576160, Telex:MA 60205, Fax:572-555
Abstract
Photogrammetric-Remote Sensing approach for monitoring shoreline erosion is devised and evaluated. Shoreline analysed from aerial photograph were digitized and later merged to the recent satellite data of the corresponding area. The output of this study indicates that this techniques provide an agreeable result to the conventional field measurements within tolerable extents.
Introduction
For best planning, in controlling or retarding the process of shoreline erosion, for the coastal evolution process need to be fully understood .Hence, for the purpose of monitoring the coastal evolution process at one effected beach site require the data to be recorded for a reasonably long period of time, sufficient enough for the movement of the shoreline trend to be tracked .in practice, however, due to certain planning circumstances such as financial, tine constraints, etc; the consulting coastal engineers who were tendered to a coastal protection work often nave to implement their project in a given period of time. This in turn would definitely be an impossible task to monitor the evolution trend .As a result, monitoring beach phemenonal carried out in the early stage of the project within a short time frame, although it will not represent the true evolution of the shoreline erosion that were taking place.
Consequently, this study will concentrate on the preliminary evaluation of the photogrammetric-remote sensing analysis for providing alternative on spatial information of the movement trend of shoreline. In this approach, the shoreline from previous record such as aerial photographs of the effected area were analysed and later merged them to a recent satellite remote sensing data. The merging of the data captured by photogrammetric means to the satellite remote sensing data requires the vectorised shorelines be rasterized, registered to a common geodetic base. The validation and verification of the photogrammetric-remote sensing approach were then made by comparing the amount of shorelline movements detected from ancillary information gained. From the certified plan of the cadastral survey and hydrographic charts.
Methods
- Study area
The study area, located to the north of Terengganu river, comprises approximately 6 km of sandy beaches, extending northerly from Tanjong Takir to sultan Mahmud Airport. Within the study reach, there are several fishing villages which are now being seriously threatened by beach erosion (did, 1985).
See figure 1.
This study area is part of littoral drift cell along the coast of peninsular Malaysia extending from Terengganu River mouth at 10 km northwards tip to Kuala Merabang Telipok. Changes in this littoral cell will certainly have an impact on the shoreline of the study area (DID, 1982).
Fig. 1. Location of the study area and its vicinity
