• Title/Summary/Keyword: Long-term bed changes

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Analysis of Dalcheon River Bed Change using GSTARS Model (GSTARS 모형을 이용한 달천의 하상변동 해석)

  • Lee, Jong-Hyeong
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.7 no.6
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    • pp.1264-1270
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    • 2006
  • In this study, semi-two dimension numerical model(GSTARS 2.1 model) were applied to study on the hydraulic and sedimentologic characteristics of downstream channel section in Dal stream. GSTARS 2.1 model was applied for the four selected sediment transport formulas(Meyer-Peter and Muller, Acker and White's, Engelund and Hanson, Yang formula) from 1984 to 1992 measured data on each section. The simulation results of Meyer-Peter and Muller formula for long-term bed changes are good when compared to the measured data. When quantitatively compared, it appears that the results data is relatively underestimated compared to the 1992 measured data on each section. Using Meyer-Peter and Muller formula, analyse the effects of bed changes by stream tube number.

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A Riverbed Change Prediction by River-Crossing Structure -Focused on the Major River Reaches of the Multifunctional Administrative City- (하천 횡단구조물에 의한 하상변동 예측 - 행정중심복합도시 주요 하천구간을 중심으로 -)

  • Yeon, Kyu-Sung;Jeong, Sang-Man;Yun, Chan-Young;Lee, Joo-Heon;Shin, Kwang-Seob
    • Journal of the Korean Society of Hazard Mitigation
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    • v.9 no.1
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    • pp.107-113
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    • 2009
  • This study has been conducted for the long-term riverbed change prediction on Geum River and Miho Stream surrounding the planned Multifunctional Administrative City and the neighboring regions by the construction of a small dam. Based on the analysis of vertical riverbed changes of the cross-sectional data for the years 1988, 2002 and 2007, minimum bed elevation significantly decreased in both Geum River and Miho Stream in 2007 as compared to 1988. Compared to 2002, however, a slight elevation change was observed. To make a long-term prediction on riverbed changes by the construction of a small dam, a one dimensional HEC-RAS 4.0 model has been used. By the fixed bed model test, the water levels were calibrated. By using the cross-sectional data of 1988 and 2002, verification was conducted under a movable bed model. According to the prediction of riverbed changes for each scenario with varying height of small dam, minor impact is expected around Miho Stream while major impact is expected around Geum River by 2017, as the small dam height increases. If the small dam is 7m-high, for example, it's been simulated that 1.59m deposition would be expected around the upper stream of Miho Stream Confluence while 1.98m scour would be expected around the downstream of the small dam.

Channel change of the Naesung Stream during 2012~201 (2012~2016년 기간 내성천의 하도 변화)

  • Lee, Chanjoo;Kim, Donggu;Kim, Ji-Sung
    • Proceedings of the Korea Water Resources Association Conference
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    • 2017.05a
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    • pp.333-333
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    • 2017
  • Recently, long-lasting landscape of the Naesung Stream has been changed due to encroachment of vegetation. To analyze patterns and causes of these changes, Korea Institute of Civil Engineering and Building Technology (KICT) has been carried out long-term monitoring research for the 56.8 km long study reach of the Naeseong Stream. Using the consecutive airborne LiDAR survey data obtained from 2012~2016, changes of channel bed forms such as bars could be detected. For the last four years of monitoring, mid-channel bars has been formed along the straight reaches and the existing bars showed vertical accretion caused by deposition on the vegetated surfaces.

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Short-term Change in Channel Morphology of the Naeseong Stream before the Operation of Yeongju Dam, Korea (영주댐 운영 전 내성천에서 하도 형태의 단기 변화)

  • Lee, Chanjoo;Kim, Donggu
    • Ecology and Resilient Infrastructure
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    • v.4 no.1
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    • pp.12-23
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    • 2017
  • The Naeseong Stream is a meandering sand-bed stream flowing through mountains and has so long maintained its geomorphological uniqueness characterized by extensive braided bare bars. Recently, its long-lasting landscape has been changed due to encroachment of vegetation. In this study being a part of long-term monitoring research morphological changes of the 56.8 km long study reach of the Naeseong Stream, which occurred during the period of 2012 - 2016 were analyzed. Airborne LiDAR and terrestrial cross-section surveys were carried out. Hydrological and on-site investigation data were also collected. Among the main four sites, two bend reaches showed point bars enlarged, while along the other two straight reaches mid-channel bars were either newly formed or increased in area and height. At the highest deposition point of each bar, vertical changes which were caused by one or two times of sediment deposition amounted to 0.6 - 1.4 m. On the contrary channel bed degradation was not obvious. Overall morphological changes in the study reach were attributed to deposition of sediment which occurred during the flood in July 2016 on the bar surfaces vegetated during the precedent dry seasons. These kind of geomorphological processes are thought to be the same as those related to the existing mid-channel islands along the mid- and downstream reach of the Naeseong Stream.

Unconstrained Estimation of Body Postures on Bed Using Polyvinylidene Fluoride Film-based Sensor (PVDF 필름 기반 센서를 이용한 무구속적인 누운 자세 추정)

  • Seo, Sangwon;Hwang, Su Hwan;Yoon, Hee Nam;Jung, Da Woon;Choi, Jae Won;Lee, Yu Jin;Jeong, Do-Un;Park, Kwang Suk
    • Journal of Biomedical Engineering Research
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    • v.35 no.5
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    • pp.169-176
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    • 2014
  • As body postures on bed affects various sleep related diseases, it is considered as important information when monitoring sleeping in daily life. Though there have already been a few approaches to monitor body postures on bed conventionally, the development for simple and unconstrained methods is still needed to realize the long-term daily monitoring. Focusing on the fact that ballistocardiogram changes depending on the body postures on bed, we developed a novel method to estimate body posturesusing extremely simple, film-type ballistocardiogram sensor which is based on polyvinylidene fluoride(PVDF) film. With 10 subjects, we performed two experiments. One was for an estimation test to show that body postures on bed can be estimated by ballistocardiogram, and the other was for a reproducibility test to present the feasibility of ballistocardiogram based body postures monitoring. To estimate body postures on bed, we made an individual template set of body postures by designating one ballistocardiogram (BCG) sample as a template in each postures. Then, we calculated Pearson's correlation coefficients between a sample and each templates and estimated the body posture of the sample by choosing a posture which corresponds to the most significant correlation coefficients. As a result, we estimated body postures on bed with 99.2% accuracy in average and found that the estimation using ballistocardiogram is reproducible.

Dataset of Long-term Investigation on Change in Hydrology, Channel Morphology, Landscape and Vegetation Along the Naeseong Stream (II) (내성천의 수문, 하도 형태, 경관 및 식생 특성에 관한 장기모니터링 자료 (II))

  • Lee, Chanjoo;Kim, Dong Gu;Hwang, Seung-Yong;Kim, Yongjeon;Jeong, Sangjun;Kim, Sinae;Cho, Hyeongjin
    • Ecology and Resilient Infrastructure
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    • v.6 no.1
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    • pp.34-48
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    • 2019
  • Naeseong Stream is a natural sand-bed river that flows through mountainous and cultivated area in northern part of Gyeongbuk province. It had maintained its inherent landscape characterized by white sandbars before 2010s. However, since then changes occurred, which include construction of Yeongju Dam and the extensive vegetation development around 2015. In this study, long-term monitoring was carried out on Naeseong Stream to analyze these changes objectively. This paper aims to provide a dataset of the investigation on channel morphology and vegetation for the period 2012-2018. Methods of investigation include drone/terrestrial photography, LiDAR aerial survey and on-site fieldwork. The main findings are as follows. Vegetation development in the channel of Naeseong Stream began around 1987. Before 2013 it occurred along the downstream reach and since then in the entire reach. Some of the sites where riverbed is covered with vegetation during 2014~2015 were rejuvenated to bare bars due to the floods afterwards, but woody vegetation was established in many sites. Bed changes occurred due to deposition of sediment on the vegetated surfaces. Though Naeseong Stream has maintained its substantial sand-bed characteristics, there has been a slight tendency in bed material coarsening. Riverbed degradation at the thalweg was observed in the surveyed cross sections. Considering all the results together with the hydrological characteristics mentioned in the precedent paper (I), it is thought that the change in vegetation and landscape along Naeseong Stream was mainly due to decrease of flow. The effect of Yeongju Dam on the change of the riverbed degradation was briefly discussed as well.

Simulations of Long term Bed Changes in the Hyungsan River Using the Numerical Model (수치모형을 이용한 형산강의 장기하상 변동 모의)

  • Ahn, Jung-Min;Lyu, Si-Wan;Lee, Nam-Joo;Yeo, Hong-Goo
    • Proceedings of the Korea Water Resources Association Conference
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    • 2007.05a
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    • pp.1272-1276
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    • 2007
  • 하천유황, 하상재료, 하도지형의 자연적 또는 인위적 변화에 의한 장 단기적 하상변동의 해석 및 예측은 하천계획 및 관리를 위해 필수적이다. 본 연구에서는 하상변동 수치모형들을 적용하여 형산강의 장기 하상변동을 모의하고 그 결과를 통하여 각 모형별 특성을 비교하였다. 모의 과정으로는 형산강 수계에서 수위표 설치지점인 형산강교, 강동대교, 국당2교, 신형산강교 4지점에서 유사량 측정을 실시하여 실측자료를 확보하였다. 형산강 수계의 하상변동을 예측하기 위한 하상변동모형으로는 HEC-6, GSTARS모형을 선정하였고, HEC-6모형에서는 유사량 산정공식으로 하상상승 현상을 가장 잘 보여주는 Laursen공식을, GSTARS모형에서는 상대적으로 가장 안정적인 Ackers & White공식을 사용하였다. HEC-6, GSTARS모형을 상호 비교한 결과, HEC-6모형이 상대적으로 하상변동을 크게 산정하는 것으로 나타났다.

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Effects of Reduced Sediment Dynamics on Fluvial Channel Geomorphology in the Jiseok River (유사계의 역동성 감소가 지석천 충적하도의 지형변화에 미치는 영향)

  • Ock, Gi-Young;Lee, Sam-Hee
    • Journal of Korea Water Resources Association
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    • v.45 no.5
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    • pp.445-454
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    • 2012
  • The present study aims to investigate the long-term channel morphological changes derived from channelization, embankment and levee construction works in unregulated fluvial channel of the Jiseock River. Analyses of aerial photographs taken past (Year 1966) and recent (Year 2002) showed the temporally remarkable changes in channel planform such as channel shape, bar migration, vegetation encroachment in bar. During the period, the natural single threading changed into braided types together with decreasing sinuosity by 9.2%, increasing vegetation occupied bar ranged 97% of total bars area. Because such channel morphological changes are closely similar to those in dam downstream channels, we assume that both/either flow regime alteration and/or sediment transport discontinuity may be critical for the fixed channel and spread of vegetated bars even in unregulated river without dam reservoir upstream. We found more reduced frequency and magnitude of flooding water level comparing with past, but no significant alteration of inter annual water level variation. Bed material has been coarsened by 4~5 times and the riverbed has been degraded in overall channel but aggraded locally in conjunction reach of tributaries. The results indicates that reduced sediment dynamics in fluvial channel which derived by bed material coarsening, river bed degradation and unbalanced sediment transport capacity between tributary and mainstem can be a causal factor to trigger channel morphological changes even in unregulated rivers.

Dataset of Long-term Monitoring on the Change in Hydrology, Channel Morphology, Landscape and Vegetation Along the Naeseong Stream (I) (내성천의 수문, 하도 형태, 경관 및 식생 특성에 관한 장기모니터링 자료 (I))

  • Lee, Chanjoo;Kim, Dong Gu;Ji, Un;Kim, Jisung
    • Ecology and Resilient Infrastructure
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    • v.6 no.1
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    • pp.23-33
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    • 2019
  • Naeseong Stream is a sand-bed river that flows through the northern area of Gyeongbuk province. It is characterized by dynamic sandy bedforms developed in response to the seasonal hydrological fluctuation and by its unique riverine landscape called "white river." However, changes including construction of Yeongju Dam from 2010 and the extensive vegetation establishment around 2015 occurred along the Naeseong Stream. This paper aims to analyze climate, hydrology, and water quality as factors and to examine the possibility of channel changes accordingly. The second least precipitation during the last 60 years happened in 2015, which led to the lowest peak discharge in 50 years. The sediment characteristics of Naeseong Stream were not significantly different along the upstream and downstream reaches, but it was confirmed that annual minimum water level of the stream decreased continuously regardless of the dam construction. This suggests that intermittent drought and change in water quality are likely to provide favorable conditions for riparian vegetation establishment and the resulting physical changes have affected riverbed degradation. Therefore, it is necessary to conduct diversified monitoring in connection with river vegetation change in order to analyze the causes of river changes.

The Modeling of the Differential Measurement of Air Pressure for Non-intrusive Sleep Monitoring Sensor System

  • Chee, Young-Joon;Park, Kwang-Suk
    • Journal of Biomedical Engineering Research
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    • v.26 no.6
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    • pp.373-381
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    • 2005
  • The respiratory and heart beat signals are the fundamental physiological signals for sleep monitoring in the home. Using the air mattress sensor system, the respiration and heart beat movements can be measured without any harness or sensor on the subject's body which makes long term measurement difficult and troublesome. The differential measurement technique between two air cells is adopted to enhance the sensitivity. The concept of the balancing tube between two air cells is suggested to increase the robustness against postural changes during the measurement period. With this balancing tube, the meaningful frequency range could be selected by the pneumatic filter method. The mathematical model for the air mattress and balancing tube was suggested and the validation experiments were performed for step and sinusoidal input. The results show that the balancing tube can eliminate the low frequency component between two cells effectively. This technique was applied to measure the respiration and heart beat on the bed, which shows the potential applications for sleep monitoring device in home. With the analysis of the waveform, respiration intervals and heart beat intervals were calculated and compared with the signal from conventional methods. The results show that the measurement from air mattress with balancing tube can be used for monitoring respiration and heart beat in various situations.