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Identification and Delineation of Turag River Basin Boundary Using Remote Sensing Techniques

M. A. Salam
Agriculture DivisionBangladesh Space Research and Remote Sensing Organization (SPARRSO)Agargaon, Sher-e-Bangla Nagar, Dhaka-1207, Bangladesh

M. S. Alam
Department of Geography and EnvironmentJahangirnagar University, Savar, Dhaka-1342, Bangladesh

Abstract/ Executive Summary:

The objective of this study was to identify the Turag river basin boundary using remote sensing techniques. Aerial photographs and Topographic maps from Survey of Bangladesh have been used for this study. Various remote sensing data namely Landsat TM (Thematic Mapper) and Quick Bird have been also to support the analysis. Digital Elevation Model (DEM) and as well as the Global Position System (GPS) based ground truth information have been used for the verification of the analyzed results. The Turag river basin boundary has been delineated and length of the basin boundary is 197.79 km and the total area of the Turag river basin is 1160.48 sq-km. Remote sensing data was very useful for identification and delineation of Turag river basin boundary but further high resolution remote sensing data can improve the accuracy level. Moreover, different seasonal temporal data (dry and wet) are also required for achieving the convincing results. However the study showed that different type of remote sensing sensors data are also useful for this study.

Keywords: Satellite, Sensors, Landsat TM, Aerial photography, Quick Bird, Digital Elevation Model

Location: Turag river basin boundary

Start Date: 00-01-2012

End Date: 00-12-2012

Program Area: Resource Development and Management

Non-commodity: Adoption of technology

Objectives:

1. To delineate the Turag River basin boundary therefore the researchers may undertake their study as a basin wise which may termed as ‘basin approach’.

Methodology:

Identification of the Basin Boundary - A river basin boundary is the area which is drained that river and its tributaries. It is also termed as drainage basin which is consists of two components, firstly the streams and rivers that carry the water and secondly the land area from where the water is drained out. The drainage basin is separated from its neighbour basin by the line called drainage divide. Delineation of a River Basin Boundary - There are several methods adopted by various researcher and in general those are: i) Manual delineation and ii) Automated delineation. In case of manual delineation contour lines, trigonometric pillars, spot heights and also the features involved in depicting the surface hydrology are taken into consideration. On the other hand the automated delineation is mainly based on the terrain information and for this the source may from Digital Elevation Model (DEM), Triangular Irregular Network (TIN) model etc. In the present study manual delineation method had been adopted for Turag river basin boundary delineation. The main reason behind this, the study area is mostly flat and a very less variation in terrain height. Secondly, there is unavailability for high resolution DEM. However, after delineation of Turag river basin boundary it has been superimposed/ overlaid on the existing DEM and reasonable matching has been between the delineated basin boundary and the surface topology. Data and Software Used - Black and white of aerial photographs of 2000 has been used under supervision from competent authority within SPARRSO laboratory. Survey of Bangladesh (SOB) Topographic maps (1:50,000 scale). Landsat TM data and the Quick Bird images have also been used for the study. Digital Elevation Model (DEM) derived using bands 3N and 3B from an ASTER Level-1A data set. (http://asterweb.jpl.nasa.gov/content/03_data/01_Data_Products/release_DEM_relative.htm) Digital image processing (DIP) of the satellite data were carried out in ERDAS IMAGINE software. Vector layers have been prepared in Arc/Info software. Using Remote Sensing method: Delineation of Turag river basin has been accomplished by manual delineation from black and white aerial photographs. As supplementary information, topographic maps (1: 50,000 scale), Google Earth images and as well as Landsat images were also used to assist the visual interpretation. On screen digitization technique has been used for this purpose which is very useful for easy editing and reached on the decision for trial again and again up to the satisfaction on a certain level. Using Topographic map method: The basin boundary has also been delineated using the topographic maps as a base and digitizing for storage and analysis in Arc/Info GIS. The basin boundary has been delineated by a combination of interpretation spot height, trigonometric pillars, road networks, artificial dams and feathers depicting the surface hydrology such as rivers, khals, canals, and ditches for water reservation. Finally comparing the outputs derived from the above two sources the final basin boundary has been generated.

Source of Information: J. Environ. Sci. & Natural Resources, 7(1): 169 - 175, 2014; ISSN 1999-7361

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The Turag river basin boundary has been delineated and length of the basin boundary is 197.79 km and the total area of the Turag river basin is 1160.48 sq-km. Remote sensing data was very useful for identification and delineation of Turag river basin boundary but further high resolution remote sensing data can improve the accuracy level. Moreover, different seasonal temporal data (dry and wet) are also required for achieving the convincing results. However the study showed that different type of remote sensing sensors data are also useful for this study.

Knowledge Management: Journal