| Year of Publication | 2015 | Division | Applied Meteorology Research Division |
|---|---|---|---|
| Title | Seasonal Variation of Water Temperature Before and After Weir Construction Using Satellite Image in the Nakdong River | ||
| Author | 김상우 | ||
| Coauthor | 김해동, 임진욱, 안지숙 | ||
| ISBN(ISSN) | 1225-4517 | Name of Journal | 한국환경과학회지 |
| Category (International/Domestic) | 국내 | Vol. No. | 24 |
| Research Project Title | 응용기상기술개발연구 (2015년) | Publication Date | 2015-11-30 |
| Keywords | Seasonal variation, Satellite image, Water temperature, Weir, Nakdong River | ||
In this study we were to explore the seasonal variation of water temperature distributions before and after weir construction
at Gumi, Chilgok, Gangjung(Goryung), Dalsung in the Nakdong River using Landsat satellite images. Relationship between
in-situ water temperature and radiance values of Landsat-5, 7, 8 satellite images showed high correlation. Seasonal variation of
water temperature in Nakdong River showed that the fluctuation ranges of water temperature before weir construction were
larger than those after weir construction. This indicated that the variation of water temperature is due to the difference of heat
storage volume by weir construction and dredging work. In particular, the water temperature after weirs construction in
autumn was 4-8 times lower than that before weirs construction. Water temperature after weir construction decreased in spring
and summer at the downstream of Gumi weir and Gangjung(Goryung) weir, and the upstream of Dalsung weir. In autumn and
winter, the water temperature after weir construction increased in the upstream and downstream of the whole weirs except
upstream of Gumi weir. Relationship between water temperature and meteorological elements (air temperature, wind speed,
sunshine, radiation) showed high correlation of above 94% in air temperature, and then radiation was high correlation before
and after 65%.
at Gumi, Chilgok, Gangjung(Goryung), Dalsung in the Nakdong River using Landsat satellite images. Relationship between
in-situ water temperature and radiance values of Landsat-5, 7, 8 satellite images showed high correlation. Seasonal variation of
water temperature in Nakdong River showed that the fluctuation ranges of water temperature before weir construction were
larger than those after weir construction. This indicated that the variation of water temperature is due to the difference of heat
storage volume by weir construction and dredging work. In particular, the water temperature after weirs construction in
autumn was 4-8 times lower than that before weirs construction. Water temperature after weir construction decreased in spring
and summer at the downstream of Gumi weir and Gangjung(Goryung) weir, and the upstream of Dalsung weir. In autumn and
winter, the water temperature after weir construction increased in the upstream and downstream of the whole weirs except
upstream of Gumi weir. Relationship between water temperature and meteorological elements (air temperature, wind speed,
sunshine, radiation) showed high correlation of above 94% in air temperature, and then radiation was high correlation before
and after 65%.
