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Uda, T. 2019. Beaches in Okinawa and Recent Changes, Public Works Research Center, Tokyo, 354 pp.
定価 4,000円＋消費税 |
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本書、序文より |
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Preface |
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The Okinawa archipelago, located in a subtropical area, has well-developed coral reefs along its coastline, and the excellent natural environment of the coasts had previously well maintained. However, the natural environment of the islands is currently in a critical state because of the rapid development and the deterioration of natural coral reefs, particularly on the main island of Okinawa. Although there used to be many sandy beaches composed of coral sand, the number of such natural sandy beaches has been rapidly decreasing. The rise in the sea level due to global warming will also affect the stability of sandy beaches in Okinawa. To mitigate damage to the coasts and sandy beaches, it is necessary to determine present state of Okinawa’s coasts. Therefore, the present state of the coasts of Okinawa was investigated by field observations, and the results of the field observations of the coasts on Okinawa’s main island and Miyako and Irabu Islands were summarized in this book, together with an introduction of coastal engineering. |
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発 行： |
一般財団法人 土木研究センター |
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著 者： |
宇多 高明 |
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発行年月： |
令和元年11月 |
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価 格： |
4,000円（税別、送料別） |
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Contents |
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Preface |
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Chapter 1 Basic facts on coastal engineering |
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1.1 |
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Definition of technical terms on beach topography |
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1.2 |
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Shoreward sand transport on coral reef |
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1.3 |
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Beach changes owing to construction of artificial structures |
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1.4 |
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Disappearance of buffer zone due to construction of protection facilities |
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1.5 |
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Prediction of beach changes using the BG model |
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1.6 |
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Measures |
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1.7 |
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Necessity of coastal zone management |
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Chapter 2 General characteristics of island coasts |
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2.1 |
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Geographical classification of Okinawa’s coasts |
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2.2 |
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Classification of Okinawa’s coasts by category |
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Chapter 3 Okinawa’s east coasts |
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3.1 |
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Oku coast - Okinawa’s original natural coast |
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3.2 |
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Higashi fishing port - Longshore sand movement on coral beaches |
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3.3 |
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Fukuchi River mouth - Beach nourishment and river mouth closure |
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3.4 |
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Kanna-Fukuji River - River mouth closure |
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3.5 |
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Tsuhako artificial beach - Windblown sand after beach nourishment |
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3.6 |
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Azama-sansan Beach - Windblown sand on artificial beach |
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3.7 |
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Azama-sansan Beach - Deposition of windblown sand by strong wind during T1824 |
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3.8 |
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Argi Island - Construction of seawall at excessively seaward location |
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3.9 |
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Miibaru Beach - An appropriate way of constructing a landing pier for boats |
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3.10 |
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Oujima Island - Impact of seawall on sandy beach |
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3.11 |
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Oujima Island - Shoreward sand movement on coral reef |
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3.12 |
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Komesu Beach - Natural sandy beach |
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Chapter 4 Okinawa’s west coasts |
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4.1 |
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Uga in Kunigami Village - Wave runup |
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4.2 |
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Tsuha Beach in Ogimi Village - Failure of seawall and river mouth closure |
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4.3 |
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Sumuide Beach on Yagaji Island - Beach changes caused by construction of offshore fishing port |
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4.4 |
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Preservation of natural sandy beach on Kourijima Island |
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4.5 |
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Bisezaki Point - Rows of Fukugi trees |
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4.6 |
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Minnajima Island - Beach changes triggered by artificial alteration |
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4.7 |
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Artificial beach in Nago City |
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4.8 |
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Agarie Beach in Nago City - Shoreline changes on artificial beach |
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4.9 |
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Agarie Beach in Nago City - Damage by T1824 |
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4.10 |
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Sunset Beach - Notes in planning of a pocket beach |
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4.11 |
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Araha Beach in Chatan City - Formation of artificial beach and loss of sand |
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4.12 |
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Bibi Beach in Itoman City - Continuous maintenance of artificial beach |
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Chapter 5 Coasts on Miyako and Irabu Islands |
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5.1 |
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Uga in Kunigami Village - Wave runup |
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5.2 |
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Tsuha Beach in Ogimi Village - Failure of seawall and river mouth closure |
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5.3 |
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Sumuide Beach on Yagaji Island - Beach changes caused by construction of offshore fishing port |
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5.4 |
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Preservation of natural sandy beach on Kourijima Island |
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5.5 |
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Bisezaki Point - Rows of Fukugi trees |
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5.6 |
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Minnajima Island - Beach changes triggered by artificial alteration |
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5.7 |
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Artificial beach in Nago City |
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5.8 |
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Agarie Beach in Nago City - Shoreline changes on artificial beach |
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5.9 |
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Agarie Beach in Nago City - Damage by T1824 |
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5.10 |
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Sunset Beach - Notes in planning of a pocket beach |
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Chapter 6 Conclusion |
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