• Title/Summary/Keyword: 조위기준점

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The Estimation of Design Tide Level over the West Coast of Korea Based on the Kriging Model (크리징 모형을 이용한 서해 설계 기준 조위면의 추정에 관한 연구)

  • Lee, Jae-Hyeong
    • Journal of Korea Water Resources Association
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    • v.30 no.6
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    • pp.611-620
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    • 1997
  • The history of Tidal Bench Mark(TBM) at four major tide observation stations on the the Korea West Coast is reviewed. The data concerned with the local mean sea level(LMSL), the datum level(DL), and TBM is collected and checked. The values of LMSL surveyed by Rural Development Corporation(RDC), Office of Hydrographic Affair(OHA), and Office of Port Affair(OPA) are compared so that their unbiased MSLs at four stations are determined. Kriging model is introduced to estimate the design levels for tide; DL, MSL, and high water spring tide(HWOST). The estimated design level is well fitted with the sample data. The value of the identified drifts increase with the latitude. The estimated semi-variograms ${\gamma}(h)$ show self similarity. The values of the ${\gamma}(h)$ for DL and HWOST are 0.005 times as much as the values of ${\gamma}(h)$ of MSL.

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The Research about Efficient Control of the Territorial Base Point (영해기준점의 효율적 유지관리 방안에 관한 연구)

  • Choi, Yun-Soo;Kim, Jae-Myeong;Yun, Chang-Beom
    • Spatial Information Research
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    • v.18 no.1
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    • pp.39-48
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    • 2010
  • Recently, many countries are promoting the rapid development of marine for securing territorial sea. The importance of territorial sea has being emphasized as territorial disputes among countries has been increasing. The South Korea should be encouraged to expand the territory due to territorial disputes with neighborhood countries. The purpose of this study is to derive a improvement plan for the efficient control of the territorial base point through analyzing the existing territorial base point and checking the territorial base point. Therefore, we proposed a variety of new plans for accurate positioning by sea level observation and MBES, reduced the surveying procedure through analyzing the existing territorial base points and provided a basis for the territorial base points which can be the 2nd grade national control points by improving a grade. We also suggested that the territorial base points and sub-territorial base points' database should be given standardized number for increasing the efficient management of other national control points and territorial base points. Finally, we suggested a improved work regulation about analysis and maintenance for territorial base points, the information activity of territorial base points and the new plan of community relations. This study will be a basis for the foundation of maritime territory which could be superior to other countries and the expansion of maritime territory.

The Study of Coastal Change Detection Ortho Aerial Photo and Hydrographic Survey: Parcels Submerged (정사항공사진과 해양조사측량을 이용한 해안선변화 탐지에 관한 연구: 포락지 중심으로)

  • Choi Chul Eung;Kim Youn Soo;Suh Yong Cheol
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.17 no.2
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    • pp.61-69
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    • 2005
  • The coastal erosion and the look of a heap which are mainly occurred in the district along the coast are found for various forms such as the estuary closing, the estuary sand bar the development of the coast sand bar, and the modification of coastline. Recently, due to the coastal development, these transformations have been intensified. The change of coast, which has been made slow progress is required long-term study on a searching examination of the root cause and a suggestion of a counter measure. In this research, ortho aerial photos were produced to analyze volumes of topographical alternations that have been progressed fer the long run, by 10s cycle from 1940s through 1990s, to compute accurate volumes of coastline variation, through a datum point and G.C.P (Ground Control Point). Also in this study, without respect to water level, the coastline variation was analyzed by using comparatively analyzed a Idlest land map, a cadastral map. And to analyze topographical variation volumes, the tidal station's materials was used under consideration f3r tide. Finally, topographical variation volumes are comparatively analyzed through surveying and sounding and a point of fine of aviation photographing was calculated and revised. After this research, by using ortho aerial photos, We can understand efficiency of these in computing volumes of variations of coastline by analyzing quantitatively erosion and look of a heap. Besides, in the future, these will be used for information gathering of the coastline integration control system.

Analysis of Ground Watertable Fluctuation at the Sandy Barrier Island on Jinu-do in Nakdong River Estuary (낙동강 하구역 진우도 자연해빈의 지하수위 변동해석)

  • Park, Jung-Hyun;Yoon, Han-Sam;Lee, In-Cheol
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.20 no.4
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    • pp.382-388
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    • 2014
  • This study selected five observational stations in the normal direction of Jinu-do(island) shoreline and observed water temperature, electrical conductivity and pressure from March, 2012 to January, 2013(about 11 months) and attempted to see the variation characteristics of ground watertable. This study wants to know : 1) External environment force factors(tide, climate, wave etc.) affecting ground watertable variation through time series and correlation analysis. 2) Spatial variations of ground watertable and electrical conductivity change by storm event. First, we found that the station at the intertidal zone was strongly affected by wave and tide level and the stations at sand dune and vegetation zone was affected by precipitation and tide level through time series data and correlation analysis. Second, during the storm event, we found that ground watertable and electrical conductivity are stabilized at the start line of sand dune and vegetation zone and transition zone between freshwater layer and seawater layer exists in the experiment area and is about 50~70 m from coastline of the south side of Jinu-do(island).

Comparison of Sea Level Data from TOPEX/POSEIDON Altimeter and in-situ Tide Gauges in the East Asian Marginal Seas (동아시아 주변해역에서의 TOPEX/POSEIDON 고도 자료와 현장 해수면 자료의 비교)

  • Youn, Yong-Hoon;Kim, Ki-Hyun;Park, Young-Hyang;Oh, Im-Sang
    • The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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    • v.5 no.4
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    • pp.267-275
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    • 2000
  • In an effort to assess the reliability of satellite altimeter system, we conducted a comparative analysis of sea level data that were collected using the TOPEX/POSEIDON (T/P) altimeter and the 10 tide gauge (TG) stations in the satellite passing track. The analysis was made using data sets collected from marginal sea regions surrounding the Korean Peninsula at T/P cycles of 2 to 230, which correspond to October 1992 to December 1998. Because of strong tidal activity in the study area, treatment of tidal errors is a very critical step in data processing. Hence in the computation of dynamic heights from the Tn data, we adapted the procedures of Park and Gamberoni (1995) to reduce errors associated with it. When these T/P data were treated, the alias periods of M$_2$, S$_2$, and K$_1$ constitutions were found at 62.1, 58.7, and 173 days. The compatibility of the T/P and TG data sets were examined at various filtering periods. The results indicate that the low-frequency signal of Tn data can be interpreted more safely with longer filtering periods (such as up to the maximum selected values of 200 days). When RMS errors for 200-day low-pass filter period was compared among the whole 10 tidal stations, the values spanned in the range of 2.8 to 6.7 cm. The results of correlation analysis at this filtering period also showed a strong agreement between the Tn and TG data sets over the whole stations investigated (e.g., P values consistently less than 0.0001). According to our analysis, we conclude that the analysis of surface sea level using satellite altimeter data can be made safely and reasonably long filtering periods such as 200 days.

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The Study on Accuracy Improvement of Estuary Riverbed Monitoring (하구하상 모니터링 정밀도 향상에 관한 연구)

  • Park, Un-Yong;Kim, Yong-Bo;Back, Ki-Suk
    • Journal of Korean Society for Geospatial Information Science
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    • v.11 no.3 s.26
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    • pp.23-34
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    • 2003
  • Currently, the efficiency of GPS has been increased in the various precise survey like as the control survey and the navigation etc. Also, it is widely used in the deformation analysis of the structure, the measurement of the marine tides, the measurement of the river level and the topographic monitoring of seabed or riverbed by combined the measurement equipment for depth. In this study, we intend to increase in efficiency of the topographic monitoring of seabed or riverbed by combined with DGPS, RTK GPS and echo sounder. For this study, we defined the error correction of the echo sounder with the experiment of water tank which is considered the characteristic of estuary riverbed and then we developed the s/w for 3-dimensional monitoring of estuary riverbed and applied the s/w to field test and improved the various problems. On analyzing topography of estuary riverbed by combined GPS with echo sounder, the draught error which is yielded to change of length from the water surface by the movement of survey vessel to the end of the transducer was eliminated by geometrical rearrangement and we defined the correction formula $z=BM+SAH-DBR_{(i)}-DRT-ED$. The sounding error about the echo sounder and characteristic of estuary riverbed was found by understanding the relation of average diameter ind residual error and we defined correction formula, $Y=0.00474{\ast}ln(X)-0.0045$ by the regression analysis. and then we verified applicability of correction formula.

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Investigating Applicability of Unmanned Aerial Vehicle to the Tidal Flat Zone (조간대 갯벌에서 무인항공기 활용 가능성에 관한 연구 - 수치표고모델을 중심으로 -)

  • Kim, Bum-Jun;Lee, Yoon-Kyung;Choi, Jong-Kuk
    • Korean Journal of Remote Sensing
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    • v.31 no.5
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    • pp.461-471
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    • 2015
  • In this study, we generated orthoimages and Digital Elevation Model (DEM) from Unmanned Aerial Vehicle (UAV) to confirm the accuracy of possibility of geospatial information system generation, then compared the DEM with the topographic height values measured from Real Time Kinematic-GPS (RTK-GPS). The DEMs were generated from aerial triangulation method using fixed-wing UAV and rotary-wing UAV, and DEM based on the waterline method also generated. For the accurate generation of mosaic images and DEM, the distorted images occurred by interior and exterior orientation were corrected using camera calibration. In addition, we set up the 30 Ground Control Points (GPCs) in order to correct of the UAVs position error. Therefore, the mosaic images and DEM were obtained with geometric error less than 30 cm. The height of generated DEMs by UAVs were compared with the levelled elevation by RTK-GPS. The value of R-square is closely 1. From this study, we could confirm that accurate DEM of the tidal flat can be generated using UAVs and these detailed spatial information about tidal flat will be widely used for tidal flat management.

Development and Application of Modified SWMM to Simulate Permeable Pavement and Infiltration Trench (투수성 포장과 침투 트렌치를 고려한 수정 SWMM의 개발 및 적용)

  • Lee, Jung-Min;Lee, Sang-Ho;Park, Jae-Hyeon;Lee, Kil-Seong
    • Proceedings of the Korea Water Resources Association Conference
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    • 2007.05a
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    • pp.326-330
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    • 2007
  • 도시화 면적이 증가하면 불투수 면적이 증가하고 그에 따라 도시 하천의 평상시 유출이 감소한다. 도시유역의 평상시 수량을 회복시키는 방법으로는 침투 증진시설(투수성 포장, 침투 트렌치, 침투 측구 등)의 설치, 하수의 고도처리 후 방류 저수지에 의한 유황 개선, 지하철 용출수 활용 등이 있다. 우리나라의 경우에 일부 도시하천의 수량 감소가 심각한 상황에 이르고 있으며 이를 해결하고자 하는 노력이 최근에 나타나고 있다. 수량을 회복하려면 유량 평가를 위한 현장조사, 수량회복 계획, 재원의 반영, 수량회복 시설의 설치 및 관리의 순서로 단계별 사업이 수행되어야 한다. 계획 단계의 과업에서 필요한 사항은 여러 가지 수량 회복 방법의 영향을 정량 평가하는 것이다. 이에 핵심이 되는 것은 수량 회복 요소를 포함하거나 추가한 수문순환 평가 도구이다. 침투시설 중 투수성 포장과 침투 트렌치를 모의하도록 기존의 SWMM 모형을 수정하였다. 그 과정에서 증발량 처리와 지하수 출력기능에 대한 오류도 수정되었다. 수정 개발된 SWMM을 침투시설 모형실험 결과와 비교하여 수정된 프로그램의 적합성을 검증하였다. 투수성 포장과 침투 트렌치를 고려하여 수정된 프로그램을 안양천의 지류인 학의천 유역에 적용하여 침투시설의 효과를 분석하였다. 만일 학의천 불투수 면적의 10%를 투수성 포장으로 교체하면 하류 비산교 지점의 저수량$(Q_{275})$이 3 %, 갈수량$(Q_{355})$이 17 % 증가하는 것으로 분석되었다. 침투 트렌치의 경우 학의천 소유역 별로 100m 트렌치를 $5{\sim}10$개 시공할 경우 저수량은 약 1 %, 갈수량은 약9 %가 증가하였다. 수정 개발된 SWMM을 사용하면 침투 트렌치와 투수성 포장 이 도시 유역의 건기 수량회복에 미치는 영향을 분석할 수 있다.해 경보발령 이전에 한계수위를 넘어서는 경우(case_3)로서 분석되었다. 이러한 실패한 경보발령의 경우에 대한 원인분석 결과, 기존의 모형화를 통해 고려되지 못하였던 해안도시 홍수의 특성 중 총강우량에 대한 고려, 선행강우 여부 및 강우 지속시간, 지속시간 내 강우집중도 그리고 선정지점 내 조위의 영향과 유역내 합류식 하수관거 시스템의 영향 등 자연유역과는 다른 다소 복잡한 요소를 고려한 해안도시홍수 경보발령 기준에 대한 개선이 필요함을 확인할 수 있었다.이 좋다고 고찰된다. 6. 우리 나라의 현행 수도작기로 본 기온 및 일조조건은 수도의 분얼전기에 대해서는 호조건하에 놓여 있으나, 분얼후기인 7월 중ㆍ하순 경의 일조부족과 고온다습조건은 병해, 특히 도열병의 유발원인이 되고 있다. 7. 우리 나라의 현행수도작기로 본 전국각지의 수도의 출수기는 모두 일조시간이 적은 부적당한 시기에 처해 있다. 8. 출수후 40일간의 평균기온에 의한 적산온도 88$0^{\circ}C$의 출현기일은 수원에서 8월 23일이었고, 년간편차를 고려한 안전출수기일은 8월 19일로서 적산온도면에서는 관행 출수기일은 약간 늦다고 보았다. 9. 등열기의 평균기온에 의한 적산온도는 현행 수도작기로서는 최종한계시기에 놓여 있으며, 평균기온의 년간편차와 우리 나라의 최저기온이 낮은 점을 고려할 때, 현행출수기는 다소 늦은 것으로 보았다. 10. 생육단계별의 수도체내의 질소함량은 영양생장기의 질소함량이 과다하였으며, 출수 이후에 영양조락을 여하히 방지하느냐가 문제된다고 보았다. 11. 수리불안전답 및 천수답이 차지하는 전답면적의 비율은 차차 감소되고 있는데, 이와 전체 10a당 수량의 증가율과의 상관계수를 산출하였는데, 수리불안전답과의 상관계수 (4)는 +0.525였으며, 천수답과는 r=+0.832, 그리고 수리불안전답과 천수답을 합계한 것과의

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