대구 분지의 지형 분류

다국어 초록 (Multilingual Abstract)

This study is the classifying landforms of the Daegu Basin and examining its geomorphic development. For this study , the analysing methods such as ob serving out crops , analysing boring dat a and eximining topographic and geologic maps were engaged.
The main findings are as follows :
1. The landform of the Daegu Basin is divided into four geomorphic units ; Alluvial Plain , Low - Relief Hill, Middle- Relief Hill and Mountain. Low and flat Alluvial Plains and Low - Relief Hills are mostly u sed for downtown , while low but st eep Middle- Relief Hills are partly used for parks.
2. The Alluvial Plains of Gumho River are flood plains of which longitudinal profile is gentle, and its micro-landforms are divided into natural levee and backmarsh. Meanwhile the Alluvial Plains of Shincheon and Jincheoncheon rivers are Alluvial Fans of which longitudinal profile are relatively steep. So on the upper bed of the alluvium of Gumho River , sand and sand with gravel are accumulated near the river and clay is getting more as receding from the river. The alluvium of Shincheon and Jincheon cheon rivers, however, mostly consists of gravel.
3. The alluvium in the Daegu Basin is mostly 5∼10meters thick but it is 15∼17 meters thick near the Gumho River confluent to Nakdong river. The lower part of 3∼5meters thick is composed of gravel mixed with boulder-sized gravel. The upper part is composed of sand with gravel, or sand, or clay , and the thickness is different from area to area.
4. The middle parts of Alluvial Plain s near Ansim and Susong towns were developed by lateral erosion and lateral accretion of Gumho and Shinchen rivers. This can be proven with the fact that the relief of the bedrocks is relatively small, no 'V' shape erosion valley is found and the thickness of the alluvium is thin.
But the alluviums near Kangchang Bridge, Shincheon Bridge and Chimsan Bridge were formed on the basis of the low surface of the sea in the Ice Age. As a result, the erosion valley is buried under the alluvium and the altitude of buried valley b ot tom around Kangchang Bridge is especially low. Its attitude is 1.5 met er high, which is similar to the present sea level.
5. Shin cheon River was divided into several branches on it s alluvial fan ab out two or three centuries ago. At that time, the largest distributary river was Daegucheon, which was divided at Sangdong Bridge, through Gundle Rock , Banwoldang and Dalsung Park , and rejoined to the Gumho River near Paldal Bridge. It can be traced with many stream cut cliffs on the eastern side of the Western Low-Relief Hill. The bedrock under the alluvium of Daegucheon is deeper than that of the main stream of Shincheon , which leads to the assumption that it might be the major stream of Shincheon in the past.
6. Geomorphic developments of the Daegu Basin are as follows : In Cr etaceous Period, the river and lacustrine deposits were formed by horizontal bedding of sedimentary rocks of the Daegu area . At the end of the period, the laccolithic intrusion of granite and the contact metamorphosis of sedimentary rock occurred on the northern and west ern parts, and an desitic volcanos erupted on the southern part of the Daegu area. So, at first, the Daegu Basin was a structural basin as a result of the uplifting of surroundings. But , after that, through a long erosion process, the surrounding metamorphic sedimentary rock and andesite, which are resistant to the erosion remained as mountains and the central siltstone which is easily eroded became Low-Relief Hills and Middle- Relief Hills . After all, as a result of differential erosion , the Daegu area became the basin of erosion . After then, thin alluvium was deposited on the bedrock along the Gumho River which crosses the basin bottom from east to west and the Shincheon River which crosses from south to north.

목차 (Table of Contents)

• 목차
• Ⅰ . 서론 = 1
• 1. 연구 목적 = 1
• 2. 기존 연구 = 2
• 3. 지질 개관 = 3
• 1) 분지저의 수성 퇴적암 지대 = 4
• 2) 남부의 화산암 지대 = 4
• 3) 북동부의 화강암 지대 = 5
• 4) 하천 연변의 제4기층 = 5
• Ⅱ . 충적층 분석 = 8
• 1. 금호강 유역 = 8
• 1) 시지동∼금강동 일대 금호강 횡단 구간 및 좌ㆍ우안 충적 평야 = 8
• 2) 아양교∼안심역 일대 금호강 하상 및 우안 충적 평야 = 12
• 3) 봉무동∼동ㆍ서변동 일대 금호강 우안 충적 평야 = 14
• 4) 태전동∼구암동 일대 충적 평야 = 18
• 5) 강창교 일대 금호강 하상 및 좌ㆍ우안 충적 평야 = 20
• 2. 신천 유역 = 23
• 1) 가창교∼수성교 일대 신천 종단면 및 좌ㆍ우안 충적 평야 = 24
• 2) 범물동∼범어동 일대 신천 우안 충적 평야 = 29
• 3) 반월당네거리∼수성구청 일대 신천 횡단면 = 31
• 4) 반월당네거리∼신천교 일대 신천 횡단면 = 33
• 5) 칠성동∼침산동 일대 신천 하상 및 좌안 충적 평야 = 35
• 3. 진천천 유역 = 40
• 1) 유천교∼대구지하철공사 일대 월배 선상지 횡단면 = 40
• 2) 월곡네거리∼상인1동 보성맨션 일대 월배 선상지 종단면 = 42
• 3) 월성동∼유천동 일대 월배 선상지 선앙 및 선단 = 44
• Ⅲ . 지형 분류 = 47
• 1. 지형 분류 방법 = 47
• 2. 분류된 각 지형의 특성 = 49
• 1) 충적 평야 = 49
• (1) 금호강 충적 평야 = 51
• (2) 신천 충적 평야 = 53
• (3) 진천천 충적 평야 = 54
• 2) 저기복 구릉지 = 56
• (1) 동부 저기복 구릉지 = 57
• (2) 서부 저기복 구릉지 = 57
• 3) 중기복 구릉지 = 57
• (1) 동부 중기복 구릉지 = 58
• (2) 서부 중기복 구릉지 = 58
• (3) 북부 산록 중기복 구릉지 = 58
• 4) 산지 = 59
• (1) 북부 산지 = 59
• (2) 남부 산지 = 60
• (3) 서부 와룡 산지 = 60
• Ⅳ . 결론 = 62
• 참고 문헌 = 64
• Abstrac = 67