Influence of Construction of Dams and Waterway Tunnels on Sedimentation Rate and Bottom Topography in Sun Moon Lake, Taiwan(<Featured Article>Earth Surface Processes, Natural Disasters and Historical Environmental Changes)

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概要

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• A study was conducted to determine the influence of construction of dams and artificial waterway tunnels on the sedimentation rate and bottom topographic changes in Sun Moon Lake, a natural lake that was transformed into a reservoir for a hydroelectric power plant in Taiwan. Surveys based on bathymetric maps show that sedimentation has progressed since the beginning of the dam's operation. The shallow area near the water inlet of the waterway tunnels has spread at a sedimentation rate of up to 1 m/year. The lake bottom channel running from the tunnel to the offshore is closely related to the sediment the distribution of sediment in the lake during the past 74 years. A comparison with other reservoirs and natural lakes in Taiwan suggests that the sedimentation rate before dam construction was much lower than the average expected from the catchment size. However, the sedimentation rate has increased by about 90 to 120 times since the construction of the dam and waterway tunnels. These results indicate that artificial sediment inflow has contributed greatly to the development of the lake basin. The spatial distribution of the sedimentation rate can be expressed as a Gaussian distribution, assuming one-dimensional sedimentation in the lake. On the basis of this assumption and past sedimentation records, the future topography of the lake was calculated. The lifespan of Sun Moon Lake will be 500 years. The eastern part of the lake may disappear within 100 years, resulting in large changes in the lake topography and scenery.

• 2012-04-25

著者

• KASHIWAYA Kenji

  Institute of Nature and Environmental Technology, Kanazawa University

• Ochiai Shinya

  National Taiwan University

• Kashiwaya Kenji

  Institute Of Nature And Environmental Technology Kanazawa University

• Jen Chia-hung

  Center Of Environment Education And Safety Health National Kaohsiung Normal University

• Lin Jiun-chuan

  Department Of Geography National Taiwan University

• Ochiai Shinya

  Department Of Geography National Taiwan University

関連論文

• Estimation of Vertical Mixing Based on Water Current Monitoring in the Hypolimnion of Lake Biwa(Environmental Flows)
• Sedimentation processes in Sun Moon Lake, Taiwan(Poster session,Abstracts of the Taiwan and Japan Joint Symposium: "Geomorphological Hazards and Management" held on 17-18 March, 2008, at Taipei)
• Sedimentation processes in Sun Moon Lake, Taiwan(Oral Session,Abstracts of the Taiwan and Japan Joint Symposium: "Geomorphological Hazards and Management" held on 17-18 March, 2008, at Taipei)
• Erosion and Sedimentation in Lake-catchment Systems in Japan and Korea on the Basis of an Elementary Process Model(Earth Surface Processes, Natural Disasters and Historical Environmental Changes)
• Earth Surface Processes and Environmental Changes in Lake-catchment Systems(Earth Surface Processes, Natural Disasters and Historical Environmental Changes)
• Influence of Construction of Dams and Waterway Tunnels on Sedimentation Rate and Bottom Topography in Sun Moon Lake, Taiwan(Earth Surface Processes, Natural Disasters and Historical Environmental Changes)
• Sand Dune Evolution: A Case Study of Northeastern Taiwan(2011 International Symposium on Earth Surface Processes, Natural Disasters and Historical Environmental Changes in North-east Asia)
• Detection of Debris Fall on Gravel Slopes by Using Terrestrial Laser Scanner(2011 International Symposium on Earth Surface Processes, Natural Disasters and Historical Environmental Changes in North-east Asia)
• Premilary Study of Hillslopes Change on Mudstone Area, Southern Taiwan(2011 International Symposium on Earth Surface Processes, Natural Disasters and Historical Environmental Changes in North-east Asia)
• 特集:地表プロセス,自然災害そして歴史的環境変動
• Influence of Construction of Dams and Waterway Tunnels on Sedimentation Rate and Bottom Topography in Sun Moon Lake, Taiwan
• Preface : Earth Surface Processes, Natural Disasters and Historical Environmental Changes
• Erosion and Sedimentation in Lake-catchment Systems in Japan and Korea on the Basis of an Elementary Process Model
• Disastrous Flood Events Found in Lacustrine Sediments from Lake Biwa(Mega-Earthquake and Geomorphic Hazards)
• The Impact and Adaption of Typhoon Hazard in Taiwan : A Case Study of Typhoon Morakot 2009(Mega-Earthquake and Geomorphic Hazards)
• Preface : Mega-Earthquake and Geomorphic Hazards

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