GEOSCAN Search Results: Fastlink


TitleInterpretation of SAR images for Coastal Zone Mapping in Guyana
AuthorSinghroy, V
SourceCanadian Journal of Remote Sensing 22, 3, 1996 p. 317-328,
Alt SeriesEarth Sciences Sector, Contribution Series 20041536
PublisherInforma UK Limited
Mediapaper; on-line; digital
File formatpdf
Released2014 07 31
AbstractThis study shows that parts of the Guyana coastline have changed from a few metres to half of a kilometre over the past 20 years. This has serious implications for sea defence, coastal fisheries, and commercial agriculture.

All of the productive agricultural lands and 90% of Guyana's population live in the narrow and fertile coastal plain (425 x 20 km), which is partially below sea level. The coastal dikes contracted for sea defence and to improve irrigation of agricultural areas have recently eroded and broken in some areas, resulting in severe flooding. Large sections of the sea wall are collapsing, and approximately two-thirds of the coastline need permanent structures or replacement. It is estimated that future large-scale flooding could destroy almost $1 billion (U.S.) of economic activity in the coastal areas. The failure of the coastal defences is the result of a number of combined factors, including: the depletion of the mangrove forest buffer caused by wood cutting for fuel and choking by sling mud; an increase in storms; a possible rise in the sea level; and lack of maintenance of the engineering structures (dikes and earth dams). This paper reports on the use of CCRS airborne SAR and RADARSAT images, as well as on the use of combined SAR and TM images for coastal zone mapping, and the determination of priority areas for the repair and maintenance of sea defences. The interpretation of SAR image maps assists in locating areas of erosion and accretion, the depletion of the mangrove forest, and agricultural land uses in the coastal areas. In addition, the identification of a series of recessional marine shorelines from the SAR images provides an understanding of marine transgression and sea-level changes in coastal Guyana.


Date modified: