Characteristics Analysis of Water Body in Tidal land Reclamation Area using Landsat TM Image data
Takashi Hoshi1, Kiyoshi Torii2, Moon Soo Choi3
1Department of computer & Information sciences, Faculty of Engineering
Ibaraki University, 4-15-1 Nakanarusawa, Hitachi, 316, JAPAN
2Department of Environmental Sciences & Technology, Graduate School of
agriculture,
Kyoto University, Kitashirakawa, Sakyo ,Kyoto,606-01, JAPAN
3Graduate school of Science and Engineering, Ibaraki University,
4-12-1, Nakanarusawsa , Hitachi, 316, JAPAN
Abstract
This study is to monitor what will occur including the land use and environment in the areas with the progress of Yougsan river comprehensive agricultural development projects stage (III) located in the southwestern coast of Korean peninsula . this study analyzes the characteristics of sea water and fresh water freshening reservoir using two kinds of satellite image data taken in different times on Yngsan river 3rd stages, under construction. The image processing was carried out geometric correction and unsupervised classification. As a result, band1, band1,2 and 3 are applicable to the analysis of the shades and water quality in the freshening reservoir. And, it was also shown fundamental knowledge to extract more detailed information .
1. Introduction
In the eastern coast of Korea, there exist tidal flats vastly developed with wide gasps between the high and low tides . these areas are suitable for tideland reclamation and the comprehensive tidal land reclamation projects have been implemented for satisfying the demand of land and water resources increased since the beginning of 1970s. however, the change of tide and land use by practicing tideland reclamation project influences the environment in the area. Especially in the freshening reservoir, the water pollution by influent sewage form the upper stream and the changes of ecosystem by desalting is an important problem to solve in the development of freshening reservoir.
The purpose of this study is to analyze what will occur including the land use and environment in the area with the progress of tideland reclamation project. This study analyzes the characteristics of sea water and fresh water of freshening reservoir using two kinds of satellite image data taken in different times on Yongsan river 3rd stages, under construction . it also includes characteristic investigation of reclaimed ldn and reclamation project. The satellite imagte processing carried out a geometric correction and profile extraction, unsupervised classification. Finally, this paper discusses variables and water quality pattern to classify sea water and fresh water from image data.
2. Study Area and Outlines of Projects
The study area of the present paper is Yougsan river comprehensive agricultural development projects stage (III), located in the southwestern coast of Korean peninsula ( fig. 2.1) this is an integrated project for agricultural development including two freshening reservoir and the water area reclaimed land, land reclamation and so on. The enclosure of two gulfs for the construction of freshening reservoir was completed for Yongam lake on April 8,1991 and for Kum lake on March 24,1994. at present, the desalination of lakes are progressing both by introducing fresh water form Yongsan river estuary lake in the adjacent second stage to Yongam lake and by closing Yongam lake
and kum lake, but the connection canal to Kum lake to progress freshening process has not been completed.
Fig. 2.1 Location of Study area
The Yongsan river estuary lake was completed the construction of enclosure dike on February 28, 1981. the water resources f desalted reservoir with 253.2 million m3 storage capacity has been utilized for agricultural, industrial and urban uses.
In this district, the length of the enclosure dike for Yongam lake is 2.2 km the water resources to be developed by desalination is 153 million m3 and the area of water reclaimed land is 6,730ha. The length of the enclosure dike for Kum lake is 2.1km, the water resources to be developed is 75 million m3 and the area of water land reclamation is 3,770ha. The major works of this district are presented in table 2.1.
Table 2.1 Major works of Yongsan river 3rd stages
| Destinction |
Total |
III- 1 stage |
III- 2 stage |
| Development Area |
19,000ha |
12,200ha |
6,800ha |
| Tideland recla. |
10,500ha |
6,730 |
3.770ha |
| Irrigation Impro. |
8,500ha |
5,470 |
3,030ha |
| Sea-Dike |
3Places 4.3km |
1 place 2.2 km |
2 Places 2.1 km |
| Sluice gate |
3 Places |
1 Place |
2 Places |
| Connec. Canal |
3 Places |
8 Places |
5 Places |
| Pumping St. |
13 Places |
8 Places |
5 Places |
| Irrigation Canel |
39 Places 285 km |
21 Places 180 km |
18 Places km |
The huge project such as this cause environmental changes of tide and land use by closure of sea water and the tideland reclamation work . the present study investigated spectrum characteristics of water are on the sequence of changes using two kinds of satellite images data taken in different times.
3.Satellite Image Data
The satellite image data used in this study is a data set of Landsat TM that has been utilized on the inflow pattern, and the analysis of mixing process in the mouth of a river. It is a satellite image data observed on sep.22, 1992 and on Sep. 28, 1994, the time before and after the completion of the enclosure dike in the Yongam lake and Kum lake. Table 2.2 shows the satellite image data. Geometric correction by ground control points used a topographic map of 1:50,000 scale published in September 1995 in Korea.
Table 2.2 Satellite image data
| Mission |
Landsat TM |
Landsat TM |
| Obs. date |
Sep. 22, 1992 |
Sep. 28,1994 |
| Path-Row |
116-36 |
116-36 |
| Form. type |
BIL |
BSQ |
| Cloud quan. |
0% |
0% |
