Articles written in Journal of Earth System Science
Volume 130 All articles Published: 24 March 2021 Article ID 0058 Research article
Spectral characteristics of coral reef benthic compositions in Gulf of Mannar
KANDASAMI NIMALAN MUNIAPPAN THANIKACHALAM TUNE USHA
Spectral characteristics of nine coral species (
$\bullet$ This study attempts to analyse the spectral characteristics of nine different coral reef species species (
$\bullet$ Results revealed that several coral species either fall under the broad category of Brown mode or Blue mode. Brown mode of corals was identified by a triple peaked pattern exhibiting local maxima or shoulders near 575, 600 and 650 nm. The blue modes of corals were identified by a plateau-like shape between 600 and 650 nm. The non-coral species such as seagrass and sea moss can be identified by a peak between 550 and 560 nm.
$\bullet$ It can also be noted that, irrespective of water column conditions; (i) all the coral reef benthic compositions tend to have its reflectance minimum around 674 nm (This phenomenon is due to the strong absorption of chlorophyll in that portion of EMR). (ii) Influence of water column can be seen in the rise of magnitude in the longer wavelengths of EMR for the measurements recorded based on exposed condition.
$\bullet$ Results exhibited that, most of the coral reef benthic compositions falling under either Blue mode or Brown mode of corals and the patterns of spectral signatures exhibited in this region are matching with existing global signatures.
Volume 130 All articles Published: 30 July 2021 Article ID 0147 Research article
Flood impact assessment using field investigations and post-flood survey
ALEENA ELSA MATHEW S SUJITH KUMAR G VIVEK M IYYAPPAN R KARTHIKAA P DINESH KUMAR S K DASH G GOPINATH TUNE USHA
Kerala, located in the southwest part of India experienced heavy flooding during 2018. A post-flood field survey was conducted by National Centre for Coastal Research (NCCR), Chennai to study the flood. The survey was conducted using
$\bullet$ The post-flood field survey was conducted for Kerala floods of 2018. A team from NCCR visited the flood affected central and southern parts of Kerala.
$\bullet$ NCCR Geo-Surveyor app built in-house was used for the survey. A Geo-tagged image together with the flood depth is stored in transferred online into the NCCR server.
$\bullet$ Presented the district-wise field survey result in the paper. It was noticed that the flood intensified and affected millions due to unscientific way of dam operations, which affected infrastructure and lives of many living on the banks of the river.
$\bullet$ Kerala need to consider long-term solutions like early flood warning systems, conservation of environment and proper engineered constructions near to the river banks.
Volume 132, 2023
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