• 한국물환경학회지
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• 제34권5호
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• pp.462-469
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• 2018

There are differences in method and cycle of flow rate survey depending on purpose of the operating department. To verify and use results of flow data according to the purpose, flow data of the directly measured and tele monitoring system were compared to verify validity. Flow measurement in the Ministry of Environment is aimed at setting up a standard flow of target water quality for water quality management and securing flow data of low and normal water level seasons for water quality evaluation. In this study, correlation analysis result ($R^2$) of same time zone data by direct measurement and tele monitoring system (TMS) at Seombon D point, a unit watershed of Seomjin river, for six years ('10 ~ '15) according to implementation of Total Daily Maximum Load (TDML) was wading 0.716, boating 0.962 and on bridge 0.943, and effectiveness of measurement method was verified by characteristics of flow duration as a season of dry and low-water; normal and high water are appropriate for wading, boating, and on bridge respectively. Results revealed it is reasonable to use directly measured results using the wading and boating method for low water level and dry seasons, and TMS data for rainy seasons. It can be used important data for future policy decisions.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2008년도 International Symposium on Remote Sensing
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• pp.188-191
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• 2008

The Tonle Sap, Cambodia, is a huge lake and periodically flooded due to monsoon climate. The incoming water causes intensive flooding that expands the lake over vast floodplain and wetland consisting mainly of forests and shrubs. Monitoring the water-level change over the floodplain is essential for flood prediction and water resource management. A main objective of this study is flood monitoring over Tonle Sap area using ALOS PALSAR. To study double-bounce effects in the lake, backscattering effect using ALOS PALSAR dual-polarization (HH, HV) data was examined. InSAR technique was applied for detection of water-level change. HH-polarization interferometric pairs between wet and dry seasons were best to measure water level change around northwestern parts of Tonle Sap. The seasonal pattern of water-level variations in Tonle Sap studied by InSAR method is similar to the past and altimeter data. However, water level variation measured by SAR was much smaller than that by altimeter because the DInSAR measurement only represents water level change at a given region of floodplain while altimeter provides water level variation at the central parts of the lake.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2001년도 유체기계 연구개발 발표회 논문집
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• pp.404-410
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• 2001

A new thermal type fluid level transmitter was designed and tested at the HITROL R&D institute. The relation of heat transfer and electric resistance was adopted as an operation principle. The length of a fabricated level transmitter was two meters and a water under normal temperature was used as a working fluid for the experiment Finally, the new product could have a high precision, acceptable accuracy and reasonable response time. Foreign-made level transmitter of this type is under in use for measuring water level of containment building in nuclear power plants so far. It is expected that new product will substitute it.

• 한국정보통신학회논문지
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• 제24권1호
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• pp.83-90
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• 2020

현재 상용화되어 있는 유량 측정 레이더 센서는 표면 유속을 이용하여 유량을 측정하는 방법을 사용한다. 이러한 방식으로는 표면 유속만으로 유량을 추정하는 것이기 때문에 단위 시간당 흐르는 물의 양을 정확하게 측정할 수 없다. 보다 정확한 측정을 위해서는 수위와 유속 정보 모두가 필요하며, 이에 따라 일부 상용 계측기는 수위와 유속을 각각 측정하는 두 개의 센서를 이용하여 유량을 산정하는 방식을 채택하고 있다. 본 논문에서는 하나의 FMCW 레이다 센서를 이용하여 수위와 유속을 동시에 측정할 수 있는 방법에 대하여 제안하고, 이를 위한 FMCW 레이다 송신 파형을 설계한다. 또한, 송신 파형을 기반으로 수신 신호를 모델링하여 수위 및 유속 측정 시 발생할 수 있는 문제점들에 대해 고찰하고자 한다.

• 한국농공학회논문집
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• 제62권6호
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• pp.63-72
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• 2020

With the implementation of integrated water management policies, the need for information sharing with respect to agricultural water use has increased, necessitating the quantification of irrigation water supply using monitoring data. This study aims to estimate the irrigation water supply amount based on the relationship between the water level and irrigation canal discharge, and evaluate the reliability of monitoring data for irrigation water supply in terms of hydrology. We conducted a flow survey in a canal and reviewed the applicability of the rating curve based on the exponential and parabolic curves. We evaluated the reliability of the monitoring data using a reservoir water balance analysis and compared the calculated results of the supply quantity in terms of the reservoir water reduction rate. We secured 26 readings of measurement data by varying the water levels within 80% of the canal height through water level control. The exponential rating curve in the irrigation canal was found to be more suitable than the parabolic curve. The irrigation water supplied was less than 9.3-28% of the net irrigation water from 2017 to 2019. Analysis of the reservoir water balance by applying the irrigation water monitoring data revealed that the estimation of the irrigation water supply was reliable. The results of this study are expected to be used in establishing an evaluation process for quantifying the irrigation water supply by using measurement information from irrigation canals in agricultural reservoirs.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2006년도 춘계 학술발표회 논문집
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• pp.1076-1082
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• 2006

This study measured the change of media properties using Time domain Reflectometry (TDR) and Tensionmeter (TM) to measure volumetric water content of soil affecting in land subsidence and pollutant diffusion under saturation/unsaturated condition by water-level fluctuations. Also, actual water content compared their changes aspect by dry oven test for quantitative determinations of these measured values. In the case of TM, initial unsaturated condition confirmed that range in dimension of each other different according to their establishment depth, but measured values of TM can know that is shown measured value in almost similar measuring range under drain condition after the first injection. Also, the results of TDR showed that can measure enough change of volumetric water content in saturation/unsaturated condition by water-level fluctuations. Therefore, we are judged that TDR measurement equipment is very effective to measure the variations of volumetric water content and water-level being caused in groundwater level fluctuations.

• 한국컴퓨터정보학회논문지
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• 제15권9호
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• pp.67-76
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• 2010

본 논문은 수위 측정 영역의 오염 상태에 적응적인 영상 기반 수위 계측 기법을 제안한다. 수위를 측정하기 위해 사용되는 목자판이 진흙, 부유물, 조명의 강한 반사에 의해 얼룩진 경우, 목자판 내부의 수평 성분 패턴이 유지되는 영역의 최종 위치와 목자판과 수면의 색상 차를 이용하여 얻어진 대략적인 수위 위치인 참조 수위와의 거리 차를 측정하여 목자판의 오염 여부를 판단하는 기법을 사용한다. 목자판이 오염되지 않은 경우에는 수평 성분이 유지되는 최종 위치의 근방 하단 영역에서 수평 성분의 분포를 분석하여 히스토그램이 가지는 최대값의 30%이상의 값을 가지는 위치를 수위로 검출하고, 목자판이 오염된 경우는 참조 수위 근방의 색상 변화의 국지적인 정점과 골을 검출한 후 그 변화가 가장 큰 위치를 수위로 검출한다. 검출된 영상 수위는 영상에 보이는 목자판의 눈금을 기준으로 생성한 맵핑 테이블을 이용하여 실제 수위로 변환된다. 제안한 방법의 적용 가능성과 일반성을 평가하기 위하여 실제 교량에 측정 시스템을 구축하고 같은 위치에 기존에 설치된 초음파 기반 측정 시스템과 그 측정치를 비교하였다.

• 한국산업융합학회 논문집
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• 제8권3호
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• pp.161-168
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• 2005

This study is analysis for adjacent structures and ground movement by deep excavation work. Underground Inclinometer has shown that deformation of increment is minor within to allowable limit. According to the measurements result of slope and crack for adjacent structures, a detached house showed bigger than hospital structure to deformation of increment. Variation of underground water level didn't effect so much to ground and adjacent structures movement because underground water flows in rock and didn't give the water press to propped walls. Measurement data of strut variation is within tolerance limit. Because excavation site's wall was strengthened suitably. This study will contribute in establishment of measurement standard and information-oriented construction during deep excavation in multi-layered ground including rock masses.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2022년도 학술발표회
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• pp.138-138
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• 2022

Understanding a stream's or river's discharge is essential for a variety of hydrological and geomorphological applications at various sizes. However, depending on the stream environment and flow conditions, it is crucial to use the appropriate techniques and instruments. This will ensure that discharge estimations are as reliable as possible. This study presents developed smart system for continuous measurement of open channel discharge and evaluate streamflow measurement over various techniques. This includes developed smart flow meter as flow point measurements, smart water level sensor (installed on Hydraulic Structure ? Weir) and current meters. Advantages and disadvantages of each equipment are presented to ensure that the most appropriate method can be selected. we found that smart water level sensor is more prominent once used during flood event as compared to smart flow meter and current meters, while current meters seems to show better accuracy once applied for open channel.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2009년도 춘계 학술대회 제21권1호
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• pp.553-554
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• 2009

광섬유센서 등과 같은 정밀온도센서를 이용하여 기온, 수온 및 수중 지표면 온도를 측정하고, 각각의 온도 변화에 대응하여 교량 세굴 및 수위를 파악할 수 있는 계측시스템을 개발하고 이를 소개한다. 온도계측을 통한 교량 세굴 및 수위 측정 방법은, 온도를 측정할 수 있는 센서를 수중 지표면을 기준으로 일정깊이와 높이로 설치하여 각각의 위치에 따른 온도 변화량을 분석하여 세굴량을 추정하는 시스템이며, 센서를 교각 상부까지 연장할 경우 수심 측정까지도 가능한 방법이다.