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Approximation of Flow Patterns for Submarine Channel Systems in the Arabian Sea using a GIS Approach


 
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1. Title Title of document Approximation of Flow Patterns for Submarine Channel Systems in the Arabian Sea using a GIS Approach
 
2. Creator Author's name, affiliation, country Prerna Ramesh; National Centre for Antarctic and Ocean Research, Headland Sada, Vasco-da-Gama, Goa, India
 
2. Creator Author's name, affiliation, country Dhananjai Kumar Pandey; National Centre for Antarctic and Ocean Research, Headland Sada, Vasco-da-Gama, Goa, India
 
2. Creator Author's name, affiliation, country Ravi Mishra; National Centre for Antarctic and Ocean Research, Headland Sada, Vasco-da-Gama, Goa, India
 
3. Subject Discipline(s) remote sensing; GIS
 
3. Subject Keyword(s) Multibeam Bathymetry; Flow Direction; Flow Accumulation; Stream Order; Projected Channel System
 
3. Subject Subject classification marine bathymetry; submarine channel identification
 
4. Description Abstract

The Indus fan in the Arabian Sea is the second largest submarine fan in the world after the Bengal fan. Despite being an extensive physiographic and sedimentary feature, detailed mapping of the channel systems is very limited. Identification of five unreported deep sea channels using multibeam swath bathymetry data (collected by NCAOR) led to the outset of this study. Based on this survey in conjunction with the global seafloor topography data, here we present a GIS approach to report a “Projected Channel System” (PCS). Identification of the PCS is dependent on the calculation of flow direction. The values of flow direction raster range from 1 to 128, where 1 represents east; 4 depicts south; 16 is west and north is shown as 64. Subsequent calculation of flow accumulation and ordering of streams helped in marking major and minor streams. The method has successfully captured channel systems belonging not just to Indus drainage basin but several others, in an area of 3.03 x 106 km2. Data from previously published channel systems – belonging to the Indus system were used to validate the results. Average offset distance between previously identified channels and PCS channels was ~10 km, indicating a reasonably good overlap.
 
5. Publisher Organizing agency, location
 
6. Contributor Sponsor(s)
 
7. Date (YYYY-MM-DD) 2015-07-27
 
8. Type Status & genre Peer-reviewed Article
 
8. Type Type
 
9. Format File format PDF
 
10. Identifier Uniform Resource Identifier http://technical.cloud-journals.com/index.php/IJARSG/article/view/Tech-429
11. Source Journal/conference title; vol., no. (year) International Journal of Advanced Remote Sensing and GIS; Volume 4 (Year 2015)
 
12. Language English=en en
 
14. Coverage Geo-spatial location, chronological period, research sample (gender, age, etc.) Indus fan - Arabian Sea
 
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