洛東江 流域의 洪水特性 分析

다국어 초록 (Multilingual Abstract)

A flood is one of the most serious meteorological disasters in Korea. The purpose of this study is to clarify the hydrological characteristic of Naktong R. Flood and to offer the basic data of flood prediction. Author analyzed the characteristics of occurrence aspect and flood curves of Naktong R. Floods occurred during 1963-1983. The Naktong R. Flood was defined as the situation with the peak water level exceeding 5.0 meters at Hyo˘np'ung Water Level Gauging Station. 85 cases were listed during 1963-1983.
The results of the study are summarized as follows:
1. Naktong R. Flood occurred 4.05 times yearly between March and September. The flood with the peak water level 9-9.9 meters occurred once every three years, exceeding 10 meters once every ten years.
The frequency distribution of flood occurrence showed two peaks : The first peak was in the middle of July, the second in the end of August.
2. The pressure patterns associated with floods were classified as polar front, extratropical cyclone and typhoon. 49% of the total cases were listed under polar front, 34% under extratropical cyclone and 17% under typhoon. The average water level of floods was 7.78 meters under typhoon, 7.09 meters under polar front, 6.73 meters under extratropical cyclone. The flood by polar front appeared between June and September impartially. The flood by typhoon appeared between June and September with its peak in late August. The paths of the typhoon which produced flood frequently and greatly in the Naktong river basin were to advance toward northeast across the South Sea (E₂ pattern) and to land at the Southern Coast (S pattern).
3. The characteristics of flood curve in the Naktong river basin are summarized as follows.
1) The higher was the water level of flood, the longer were the rising time, falling time and duration of flood stage. But the rising time, falling time and duration of the flood stage by typhoon were shorter than those of the floods by polar front and extratropical cyclone.
2) The falling time of flood stage was about two times longer than the rising time.
3) The regression equations between the peak water level (X) and the rising time(Y₁), falling time(Y₂) and duration(Y₃) of flood stage were respectively Y₁ = 4.244 + 3.419X, Y₂ = -22.607 + 9.924X, Y₃ = -17.16 + 12.933X.
4. The occurrence patterns of the peak water level in Naktong (the upper reaches of Naktong R.), Hyo˘np'ung (the mid-reaches) Samnangjin (the lower reaches) Water Level Gauging Station are classified as the pattern that the peak water level of the upper reaches precedes that of the lower reaches, the pattern that the latter precedes the former and the pattern that the peak water levels of two parts appear simultaneously.
5. When the typhoon Agnes (1981. 9) passed northeast across the South Sea (E₂ pattern), rain band moved from southwest to northeast in South Korea. At that time, the occurrence intervals of the peak water level between Naju (Yo˘ngsan R.) and Kurye (So˘mjin R.) between Kurye and Samnangjin (Naktong R.) were respectively 4 hours and 22 hours.

목차 (Table of Contents)

• 목차 = 1
• I. 序論 = 5
• 1. 硏究目的 = 5
• 2. 旣存硏究 = 5
• 3. 資料 및 硏究方法 = 8
• 4. 硏究地域槪觀 = 9
• II. 洪水의 發生樣相 = 14
• 1. 洪水의 發生頻度 = 15
• 2. 洪水의 發生時期 = 16
• 3. 洪水의 크기 = 18
• III. 洪水를 유발한 氣壓系 分析 = 21
• 1. 洪水를 유발한 氣壓系 分類 = 21
• 2. 氣壓系別 洪水의 特性 = 23
• IV. 洪水曲線의 分析 = 28
• 1. 洪水位의 上昇·下降·持續時間 = 28
• 2. 尖頭水位의 出現遺形 = 37
• 3. 颱風 Agnes호 통과시 洪水特性 = 41
• V. 要約 및 結論 = 46
• 參考文獻 = 48
• 英文抄錄 = 52