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제주도 중서귀유역의 관측자료 기반 지표수-지하수 유동특성 해석

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Alternative Title
Groundwater flow analysis of Middle-Seogwi watershed area based on monitored filed data
Abstract
This study estimated the groundwater recharge rates with the Soil and Water
Assessment Tool (SWAT) based on stream discharge of four sub-basins located
at Mid-Seogwi area. Calibrating hydrologic parameters of SWAT using the
collected data, the groundwater recharge rate of each subbasin was estimated.
The groundwater flow of the area was simulated using GMS-MODFLOW with
the estimated groundwater recharge rates. Groundwater level fluctuation due to
long-term pumping from existing groundwater wells in the area was analyzed
by assuming no-groundwater recharge conditions. The sensitivity analysis of
SWAT model in Mid-Seogwi watershed showed that groundwater recharge and
discharge were changed sensitively by SLOPE, SLSUBBSN, SOL_AWC, and CN_2.
The changes of the discharge and recharge rates ranged from –7% to 12% and
from –46 to 78%, respectively. As the results of regression analysis between
the measured data and the simulated data, the coefficient of determination (R^(2))
of Gangjung, Akgun, Yenwei, and Donghong was, 0.88, 0.93, 0.83, and 0.81,
respectively. SWAT model results indicated that groundwater recharge rate
increased during raining season, but decrease in dry season. During the dry
season in 2013, the recharge rate reduced more then 20% compared to the
annual average recharge rate. As the results of groundwater flow analysis in
steady state, the hydraulic gradient of the upstream area changed corresponding
to its geographic elevation change . Also, the groundwater recharge of the
downstream area headed toward the ocean from the left basin area. The
calibrated hydraulic conductivity ranged from 0.17 m/d to 1,951.0 m/d.
Continuous pumping at 477 wells in Mid-Seogwi basin for 50 days resulted in a
large groundwater level reduction in the upsteam and midstream areas. The
initial level of groundwater was calculated as 48 m by the simulation. The level
reached to the first warning level (29.97 m) after continuous 69 days pumping.
Author(s)
고재욱
Issued Date
2016
Awarded Date
2016. 8
Type
Dissertation
URI
http://dcoll.jejunu.ac.kr/jsp/common/DcLoOrgPer.jsp?sItemId=000000007835
Alternative Author(s)
Ko, Jae-Wook
Department
대학원 토목해양공학과
Advisor
양성기
Table Of Contents
目次 i
LIST OF FIGURES iii
LIST OF TABLES ⅶ
Summary ⅹ
Ⅰ. 서 론 1
1. 연구 배경 및 목적 1
1.1 연구 배경 1
1.2 연구 목적 2
2. 국내외 연구 동향 3
2.1 국외 연구동향 3
2.2 국내 연구동향 4
3. 연구 자료 및 방법 7
Ⅱ. 이론적 배경 9
1. 지하수 함양량 추정 이론 9
1.1 SWAT 모형의 개요 9
1.2 SWAT 모형의 구조 12
1.3 SWAT 모형의 수문순환 및 추정모형 15
2. 지하수 유동해석 모형 40
2.1 MODFLOW 모형의 개요 40
2.2 MODFLOW 모형의 방정식 41
Ⅲ. 연구대상 유역 및 현장 관측자료 분석 43
1. 연구대상 유역 43
1.1 유역 형상 및 지형적 특성 44
1.2 유역 표고 및 경사 분석 45
2. 현장 관측자료 분석 51
2.1 하천유출량 분석 51
2.2 지하수 관측자료 분석 58
3. 중서귀 유역의 지하수 관정현황 60
Ⅳ. 지표수-지하수 유동해석 결과 및 고찰 64
1. 지하수함양량 추정 64
1.1 SWAT 모형 입력자료 구축 및 적용 64
1.2 모형의 보정 및 검정 98
1.3 지하수 함양량 추정 결과 및 고찰 121
2. 지하수 유동해석 128
2.1 모형의 구축 128
2.2 정상류 상태에 따른 지하수 유동해석 136
2.3 지하수 함양량에 따른 지하수 유동특성 141
2.4 부정류 상태에 따른 지하수 유동해석 및 고찰 145
2.5 지속양수에 따른 지하수위 변동 특성 152
Ⅴ. 결 론 159
참고문헌 161
Degree
Doctor
Publisher
제주대학교 대학원
Citation
고재욱. (2016). 제주도 중서귀유역의 관측자료 기반 지표수-지하수 유동특성 해석
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General Graduate School > Civil and Ocean Engineering
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