著者

山本 吉道 河合 恭平 高野 哲男

出版者

公益社団法人 土木学会

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

no.24, pp.1339-1344, 2008

被引用文献数

2

---

In this research, the Ishikawa-ken area of Kaetsu coastal zone and Enshu-nada coastal zone are selected as the coastal zone where a large-scale sandy beach is left, and sedimentation control of those zones is examined in order to recover the continuity of overall movement of earth and sand, and the following plans are proposed:<BR>1) An efficient countermeasure based on sand recycling by shipping and natural carrying system due to waves and currents in the Ishikawa-ken area of Kaetsu coastal zone.<BR>2) An effective countermeasure based on natural carrying power due to Tenryu river flow and a sand bypass by trucking for short distance in Enshu-nada coastal zone.

著者

山本 吉道 中山 正広 岩井 健浩

出版者

公益社団法人 土木学会

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

no.21, pp.39-44, 2005

被引用文献数

1

---

The great earthquake of M9 was generated in the North Sumatra offing at 7: 58 on December 26th, 2004, and the serious tsunami calamity was produced in every coast of Indian Ocean. We report on the damage survey that we carried out from January 9th to 12th in Thai western coast where typical tsunami damage was produced.<BR>(1) The tsunami height of Khoa Lak coast was about 9m on the sea level, and almost all walls and pillars of buildings within 30m of coastal line were toppled. The flood region had reached to lkm or more inland.<BR>(2) The tsunami height of Patong beach was about 6m on the sea level, and almost all walls and pillars of buildings within 30m of coastal line were not toppled but the flood depth was about 2m.<BR>(3) The tsunami height of Phi Phi island is 6-7m on the sea level at the north side and 3.5-5m on the sea level at the south side.

著者

鈴木 高二朗 永井 紀彦 柳嶋 慎一 久高 将信 小川 路加

出版者

Japan Society of Civil Engineers

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.24, pp.129-133, 2008 (Released:2010-08-25)

参考文献数

8

---

Ocean wind is larger and more suitable for wind farm than inland wind. Recently, ocean wind farm has been constructed in Europe using 5MW wind power facility. Japan is surrounded by ocean and seems to be suitable for construction of ocean wind farm. However, the amount of the shallow and low wave energy area for ocean wind farm is limited except semi-enclosed bay like Tokyo bay.When we see Tokyo bay, shallow area (shallow more than 15m) is located north of Futtsu Point in Chiba prefecture. Such a shallow area is near to urban area, so the construction cost seems to be lower. In this paper, feasibility study on the ocean wind farm north of futtsu point in Tokyo bay is done compared with the other coasts of Japan.

著者

山本 吉道 河合 恭平 高野 哲男

出版者

Japan Society of Civil Engineers

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.24, pp.1339-1344, 2008 (Released:2010-08-25)

参考文献数

21

被引用文献数

2 2

---

In this research, the Ishikawa-ken area of Kaetsu coastal zone and Enshu-nada coastal zone are selected as the coastal zone where a large-scale sandy beach is left, and sedimentation control of those zones is examined in order to recover the continuity of overall movement of earth and sand, and the following plans are proposed:1) An efficient countermeasure based on sand recycling by shipping and natural carrying system due to waves and currents in the Ishikawa-ken area of Kaetsu coastal zone.2) An effective countermeasure based on natural carrying power due to Tenryu river flow and a sand bypass by trucking for short distance in Enshu-nada coastal zone.

著者

三上 信雄 安藤 亘 石岡 昇 大隈 篤 山本 秀一 北野 倫生

出版者

公益社団法人 土木学会

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

no.23, pp.925-930, 2007

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To promote utilization of Okinotorishima island and its surrounding areas mainly in the fishery field, fishery resources and environmental conditions were surveyed in and around the coral reef of the island. Corals were widely distributed in the lagoon. Some useful fishery species were caught through the wide range from the surface to the deep water around the reef. Their preys such as eggs, juveniles and young of some small sized fish species were also observed there. Therefore, it may be possible to utilize the island as a good fishing ground with an artificially increased primary production. To develop this potential, some ideas and their issues to be solved in the future were discussed in this study.

著者

清野 聡子 宇多 高明 前田 耕作 綿末 しのぶ

出版者

Japan Society of Civil Engineers

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.18, pp.431-436, 2002 (Released:2011-06-27)

参考文献数

7

---

Field observation of spawning ground of horseshoe crab Tachypleus tridentatus was carried out in August 2000 at a river mouth in Seikai-cho in Nagasaki Prefecture. Many eggs spawned under thegroundof river mouth bars were found. Morphological features of spawning ground including surrounding vegetations were investigated and compared with the results of the former studies. Results were well explained by the features summarized in the former studies. A note on conservation of rare species was discussed.

著者

熊田 貴之 小林 昭男

出版者

Japan Society of Civil Engineers

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.16, pp.315-320, 2000 (Released:2011-06-27)

参考文献数

4

---

In this paper, the results of the field survey on the coastal erosion at Kemigawa beach as the artificial beach are presented, and causes of the erosion are discussed using the sea conditions and the grain-size distribution of sands of the beach. The results of the investigation are summarized as follows:(1) The erosion at Kemigawa beach is intense compared with neighbor artificial beaches that has a characteristic like the Kemigawa beach.(2) The result of the numerical analysis using the cross section of the construction plan shows that the wave conditions of near shore at Kemigawa beach is calmness in the stormy weather.(3) The results of the grain-size analysis of sands show that the small-size sands that flow away from the center of Kemigawa beach maybe deposit at the base of the breakwater.(4) The result of the comparison between d50 of the sands and the gradient of the foreshore about the construction plan of Kemigawa beach shows that the beach has the tendency of the erosion.

著者

敷田 麻実 加藤 史訓

出版者

土木学会海洋開発委員会

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.19, pp.31-36, 2003

著者

吉田 秀樹 中島 謙二郎 川野 泰広 江口 秀之 中村 義文 日向 博文

出版者

Japan Society of Civil Engineers

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.23, pp.709-714, 2007 (Released:2010-08-25)

参考文献数

6

被引用文献数

1 2

---

The Kyushu Regional Development Bureau, Ministry of Land, Infrastructure and Transport has placed four High-Frequency Oceanic Radar System (HF radar) at the Ariake Sea with the aim of regenerating environmental condition, and has observed the surface current and ocean wave situations since 2005.The paper presents (1) the result of study for precision of HF radar observation, (2) the real-time informing system by internet named “The Ariake Sea current and ocean waves information system”, and (3) the development of “The sea garbage movement prediction system” utilized the surface current observation information by the system with the aims of the improving the sea garbage collecting service by the Advanced Anti-Pollution Vessel “KAIKI” as well as the progress of the installing the system. As result of the development, the precision is verified appropriately, and the system has been operated since April, 2007.

著者

和田 久範 竺 文彦

出版者

公益社団法人 土木学会

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.3, pp.25-27, 1987 (Released:2010-03-17)

参考文献数

6

著者

北 賢二 小林 昭男 宇多 高明 野志 保仁 和田 信幸

出版者

Japan Society of Civil Engineers

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.21, pp.409-414, 2005 (Released:2011-06-27)

参考文献数

3

---

Damages of wind blown sand were investigated at Makuhari artificial beach in Chiba Prefecture, the Chigasaki coast in Kanagawa Prefecture and Nakatajima Sand Dune in Shizuoka Prefecture. Fine sand was transported by wind and deposited on the promenade behind the beach, causing obstruction against traffics. In order to study these phenomena, field study on wind blown sand consideringg rain size effect was carried out at Kujukuri beach. It was confirmed that selective transport of fines and is important and this results in sorting effect in an extensive area.

著者

長尾 毅 藤森 修吾 築地 健太朗

出版者

Japan Society of Civil Engineers

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.24, pp.201-206, 2008 (Released:2010-08-25)

参考文献数

5

---

The reliability-based design method was recently introduced to the technical standard for port and harbor facilities. The standard method is partial factors method, however, other methods that evaluate the reliability index directly can also be applied. Taking the design of pile supported wharves as an example, performance function is implicit and the application of the methods that evaluate the reliability index directly is difficult to the practical design. This study aims at clarifying the applicability of response surface method for pile supported wharves. As the performance function can be evaluated explicitly by the method, the calculation of reliability indices is comparatively easy. The applicability of first-order second-moment method is also discussed.

著者

本間 大輔 窪内 篤 山本 泰司 畑山 朗 木村 克俊

出版者

Japan Society of Civil Engineers

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.21, pp.927-932, 2005 (Released:2011-06-27)

参考文献数

1

被引用文献数

1 1

---

On September 8, 2004, Typhoon No.0418 (Typhoon Songda) moved north along the western coast of Hokkaido, bringing high winds to wide areas in the storm zone. Omori Bridge, a 429-m-long I-girder bridge on National Highway 229, suffered the collapse of a 159-m-long section. The bridge spanned a reef that is surrounded by wave-dissipating blocks on the seaward side and precipices on the landward side. On the day of the collapse, waves were extremely high and winds were strong, and abnormal tide levels were attributed to the effect of the local topography. In this research, hydraulic model tests were performed to study the damage mechanism of the bridge and the wave forces that acted on it, in order to assess the safety of the truss bridge that will be erected for temporary restoration. The splash patterns were also examined to determine the conditions under which vehicles can safely run after the restoration.

著者

大中 晋 遠藤 秀文 西平 守孝 吉井 一郎

出版者

Japan Society of Civil Engineers

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.24, pp.825-830, 2008 (Released:2010-08-25)

参考文献数

4

---

The large-scale coral transplantation has been implemented on the reef flat area at Kuta Beach in Bali Island of Indonesia. The transplantation area is about 1.3 ha and there is no other example like this big scale coral transplantation. The asexual reproduction was applied as transplantation method by fixing coral fragments using nail with cable-tie and the limestone was adopted as artificial substrate for coral transplantation. The major species of coral to be transplanted is Acropora sp. which was taken from the same coral reef area. More than a half year has already passed after the completion of the first coral transplantation and high degree of survival rate with more than 98% could be maintained until now.

著者

和田 清 水谷 法美 村上 宗隆

出版者

Japan Society of Civil Engineers

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.16, pp.291-296, 2000 (Released:2011-06-27)

参考文献数

5

---

This paper is intended to estimate beach process and wave deformations at the Shitiri-mihama coast in Mie Prefecture. Field investigation by using an aerial photography technique is conducted along the Shitiri-mihama coast from the Kumano river mouth to the Onigashiro cape. It is clear that almost regions occurred beach erosion, especially Udono harbor region located on the left bank of the Kumano river, as the coastal line faced to sea, the beach protection works were struck by strong storms. Based on bottom sounding survey, maximum shoreline retreat was 100 meters for 5 years immediately after extend construction of breakwater around Udono harbor. It is necessary to predict water deformation for erosion control around coastal protection facilities. It is presented a time-depend mild slope equation for estimating wave deformation. Some simple calculations were conducted for modeling breakwater at the worst beach erosion area where located northern Udono harbor. The numerical model has well explanations for generation of partial standing waves, drop of mean sea level behind breakwaters.

著者

窪内 篤 関口 信一郎

出版者

Japan Society of Civil Engineers

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.21, pp.7-12, 2005 (Released:2011-06-27)

参考文献数

16

---

The HIROI formula, which estimates the wave forces, has been used in breakwater design for many years. As far as the authors know, significant wave height has been used for the HIROI formula in the past. The time when the formula was presented, however, was long before emergence of the concept of significant wave height. We verified the process of derivation of the formula by tracing back to the paper in which Dr. HIROI first presented the formula, studied the changes in wave height used for the formula and investigated the history of changes in the shape of breakwaters.As a result, we found that the highest wave height must be used for the HIROI formula, and that changes in breakwater structure existed behind the use of significant wave height in the formula.

著者

間瀬 肇

出版者

Japan Society of Civil Engineers

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.19, pp.59-63, 2003 (Released:2011-06-27)

参考文献数

1

---

This paper shows the development of wave theories and numerical methods for random wave transformations in nearshore sea. When estimating wave conditions acting on coastal structures, a suitable wave model should be chosen, depending on the situation. This paper also describes criteria for selecting wave models and shows several examples of wave predictions.

著者

上用 敏弘 広浜 全洋 山脇 司

出版者

Japan Society of Civil Engineers

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.18, pp.95-100, 2002 (Released:2011-06-27)

参考文献数

3

---

CENTRAIR, the nickname of Central Japan International Airport, is under construction in the sea off Tokoname City, Aichi prefecture. It will open in March 2005, then will be a major air-hub in global network as a gateway of Japan. CENTRAIR is located 35km south of downtown Nagoya and the access time to that is 30 to 40 minutes by rail or car.In order to construct and operate CENTRAIR, Central Japan International Airport Co., Ltd. was designated as a commissioning entity by Japanese government.CENTRAIR is on a man-made island. Dredged soil from Nagoya port is unloaded by compressed air to the north part of the island. This system, “Pneumatic Flow Mixing Method”, enable us to prepare a certain strong ground in a short period, through the mixing and kneading of the soil and cement slurry in a pipeline.

著者

横田 雅紀 安部 雄太郎 山城 賢 橋本 典明 永井 紀彦

出版者

公益社団法人 土木学会

雑誌

海洋開発論文集

巻号頁・発行日

vol.24, pp.435-440, 2008

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The current measurements have been carried out by NOWPHAS at several stations in the coastal area around Japan since 1996. In the data, temporal but simultaneous changes in residual currents were recognized at several stations in the Japan Sea side. The cause of this temporal change was deduced to be due to the strong currents caused by typhoon approach. In this study, attention was paid especially on the period of typhoon approach, and the occurrence characteristics of the strong currents in the offshore area was investigated based on the data of wind speed, the atmospheric pressure and the typhoon track provided by Japan Meteorological Agency.<BR>As a result, it was found that typhoon approach contributes to the generation of the offshore strong current in many cases. In addition to this, it was also found that the current velocity increases in the area where wind blows for a long time in the same direction. Furthermore, it was also observed that the strong current is likely to appear at more than two stations during the typhoon.

著者

犬飼 直之 杉本 高志 Pujirahajo ALWAFI 細山田 得三

出版者

Japan Society of Civil Engineers

雑誌

海洋開発論文集 (ISSN:09127348)

巻号頁・発行日

vol.24, pp.153-157, 2008 (Released:2010-08-25)

参考文献数

2

被引用文献数

2

---

The Niigataken Chuetsu-oki Earthquake occurred on July 16, 2007. The maximum magnitude of this earthquake was recorded 6.8 and the maximum JMA seismic intensity scale was recorded 6 upper, and Chuetsu area, especially around Kasiwazaki city, was damaged extensively. The Tsunami was occurred due to the earthquake, however arrived to Akita and Ishikawa shoreline. This wave was not big and there were not the extensive damage this time. However, the big tsunami following the extensive damage sometime occurs in the Sea of Japan. For example, the Tsunami due to Niigata Earthquake in 1964 became over 4 m wave height at Niigata City. Therefore, even if it was a small-scale wave and small damaged in this time, it is necessary to analysis how the people on the beach when the earthquake occurred thought, for example, how they imaged the arrival of tsunami and how to evacuate from the tsunami. Then, this study researched the hearing investigation for the people who was near from the shoreline when the earthquake occurred. The results mainly indicate that the more any evacuation route information should be shown, because the most people who come from another place do not know the information.