{"title":"A NEW FLOOD CONTROL METHOD BY DAM GATE OPERATION BASED ON RUNOFF CHARACTERISTICS OF A BASIN FOR THE IMPROVEMENT OF FLOOD MITIGATION EFFECTS OF A DAM","authors":"Masashi Shimosaka, S. Kure, Tadashi Yamada, H. Kikkawa","doi":"10.2208/JSCEJB.65.106","DOIUrl":"https://doi.org/10.2208/JSCEJB.65.106","url":null,"abstract":"本論文は，ダム貯水池の洪水調節機能向上を目的としダム放流量の新しい決定方法を提案するものである．著者らは従来から，現在まで降った降雨のうち確実にダム貯水池へ流入する量を，実際に流入する以前に放流する事前放流方法を提案している．本論文では，放流開始までの準備時間及び下流懸案地点における水位上昇速度を考慮してダムからの放流シミュレーションを行う．これにより各種法律，施設の放流能力，放流開始までの準備時間を考慮した実務に即した放流が可能な事を示すとともに，洪水低減効果向上のためには放流開始に要する準備時間を短くする必要がある事を示した．また，出水直前のダム貯水位が夏期制限水位以下の場合でも，初期水位低下量を考慮した事前放流を行うことで出水以降には夏期制限水位へと貯水位が回復することを明らかにした．","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"63 3","pages":"106-122"},"PeriodicalIF":0.0,"publicationDate":"2009-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91484778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-10DOI: 10.2208/PROCE1989.55.951
D. Nishimura, T. Kawai, Y. Horii, Takanori Morikawa, Kaname Yoshida
In recent years, there have been an increasing number of projects that adopt “wave absorbing slit caisson breakwater” to reduce construction cost in deep sea. This type of structure tends to receive strong wave force at upright wall. On account of this, there is a case study that replace upright wall with sloping wall, but it has quickened transmitted wave. Accordingly, this study was conducted to elucidate transmitted wave characteristic about “wave absorbing slit caisson breakwater with sloping top wall” of hydraulic model tests. The basic data obtained is expected to be greatly helpful in future breakwater design.
{"title":"Experimental Study on Transmitted Wave Characteristic about Wave Absorbing Slit Caisson Breakwater with Sloping Top Wall in Deep Sea","authors":"D. Nishimura, T. Kawai, Y. Horii, Takanori Morikawa, Kaname Yoshida","doi":"10.2208/PROCE1989.55.951","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.951","url":null,"abstract":"In recent years, there have been an increasing number of projects that adopt “wave absorbing slit caisson breakwater” to reduce construction cost in deep sea. This type of structure tends to receive strong wave force at upright wall. On account of this, there is a case study that replace upright wall with sloping wall, but it has quickened transmitted wave. Accordingly, this study was conducted to elucidate transmitted wave characteristic about “wave absorbing slit caisson breakwater with sloping top wall” of hydraulic model tests. The basic data obtained is expected to be greatly helpful in future breakwater design.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"142 1","pages":"951-955"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73205150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-10DOI: 10.2208/PROCE1989.55.1211
K. Kawasaki, Tomokazu Murakami, Y. Okubo, Chang-Hoon Kim, N. Mizutani
Water quality structures in a semi-enclosed water area are influenced by not only meteorological disturbances but also freshwater inflow from rivers. Large floods, in particular, have a great impact on ecosystem. In this paper, an atmosphere-ocean-wave-water quality coupled model was developed so that the primary production of phytoplankton, the decomposition of organic matters and the circulation of nitrogen and phosphorus can be estimated. The coupled model was applied to elucidate water quality structure in Ise Bay at the Tokai heavy rain. As a result, the model was found to be capable of reproducing water quality structure during the Tokai heavy rain. Furthermore, it was revealed that the abrupt change of the water quality structure during the Tokai heavy rain is mainly dominated by river load.
{"title":"Development of Atmosphere-Ocean-Wave-Water Quality Coupled Model and Numerical Analysis of Water Quality Structure in Ise Bay at Tokai Heavy Rain","authors":"K. Kawasaki, Tomokazu Murakami, Y. Okubo, Chang-Hoon Kim, N. Mizutani","doi":"10.2208/PROCE1989.55.1211","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.1211","url":null,"abstract":"Water quality structures in a semi-enclosed water area are influenced by not only meteorological disturbances but also freshwater inflow from rivers. Large floods, in particular, have a great impact on ecosystem. In this paper, an atmosphere-ocean-wave-water quality coupled model was developed so that the primary production of phytoplankton, the decomposition of organic matters and the circulation of nitrogen and phosphorus can be estimated. The coupled model was applied to elucidate water quality structure in Ise Bay at the Tokai heavy rain. As a result, the model was found to be capable of reproducing water quality structure during the Tokai heavy rain. Furthermore, it was revealed that the abrupt change of the water quality structure during the Tokai heavy rain is mainly dominated by river load.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"17 1","pages":"1211-1215"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83291574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-10DOI: 10.2208/PROCE1989.55.966
H. Yoshinaga, Yoshiyuki Ooshita, Tadashi Watanabe, Yasutaka Takamoto, T. Takano
Stabilization of the seawalls is required for protecting the important facilities along the coast of the Fukui Port. Since 2004, Ministry of Land, Infrastructure and Transport has commenced the projects for improvement of the existing seawalls for scouring and liquefaction protection, and for construction of new submerged breakwaters. Construction of “two-crested submerged breakwaters, ” which have two parallel crests along the coast, was newlycommenced in 2006. The ministry realized that stability of the submerged breakwater needs to be examined because the submerged breakwater experiences winter stormy waves while the construction of the breakwater is not yetcompleted, i. e., the total length of the breakwater is 45m compared to the designed total length of 200m. This paper presents a survey result of location of concrete armor blocks for the submerged breakwater on partial completion with using Real-Time-Kinematic GPS.
{"title":"Study on behaviors of wave-dissipating concrete blocks of submerged breakwater around the Fukui Port using GPS","authors":"H. Yoshinaga, Yoshiyuki Ooshita, Tadashi Watanabe, Yasutaka Takamoto, T. Takano","doi":"10.2208/PROCE1989.55.966","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.966","url":null,"abstract":"Stabilization of the seawalls is required for protecting the important facilities along the coast of the Fukui Port. Since 2004, Ministry of Land, Infrastructure and Transport has commenced the projects for improvement of the existing seawalls for scouring and liquefaction protection, and for construction of new submerged breakwaters. Construction of “two-crested submerged breakwaters, ” which have two parallel crests along the coast, was newlycommenced in 2006. The ministry realized that stability of the submerged breakwater needs to be examined because the submerged breakwater experiences winter stormy waves while the construction of the breakwater is not yetcompleted, i. e., the total length of the breakwater is 45m compared to the designed total length of 200m. This paper presents a survey result of location of concrete armor blocks for the submerged breakwater on partial completion with using Real-Time-Kinematic GPS.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"206 1","pages":"966-969"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77053958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-10DOI: 10.2208/PROCE1989.55.206
Nan Myat Soe, T. Asano
This study investigates a coupling field of grouped wind waves and the resultant long waves on a bar type beach. The numerical results based on the Boussinesq equation have been compared with the analytical ones for the long waves generated by the time varying breaking point mechanism. The comparison aims at elucidating the mutual interaction process between the wind waves and long waves. The influence of the long waves on short waves is found to be significant for after-breaking zone through the alteration of eddy viscosity coefficient.
{"title":"Numerical Analyses for Grouped Wind Waves and Associated Long Waves on Composite Bottom Slopes","authors":"Nan Myat Soe, T. Asano","doi":"10.2208/PROCE1989.55.206","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.206","url":null,"abstract":"This study investigates a coupling field of grouped wind waves and the resultant long waves on a bar type beach. The numerical results based on the Boussinesq equation have been compared with the analytical ones for the long waves generated by the time varying breaking point mechanism. The comparison aims at elucidating the mutual interaction process between the wind waves and long waves. The influence of the long waves on short waves is found to be significant for after-breaking zone through the alteration of eddy viscosity coefficient.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"63 1","pages":"206-210"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75030026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-10DOI: 10.2208/PROCE1989.55.306
T. Yamashita, Y. Nakamura, Eiki Miyagi, H. Oka, Yo-ichi Nishioka, H. Takeuchi, Takashi Kyan, Munehiro Hoshi
Numerical simulations for both tsunamis and storm surges on the coast of Okinawa Prefecture, which are expected to be the most dangerous cases, were conducted to evaluate the possible inundation area and potential damage. The detailed topographic model derived form filtered LiDAR observation data was applied to inundation simulation. Nonlinear long wave theory was used in tsunami simulation. The third generation wave spectrum model (SWAN) and VOF method (CADMAS-SURF) were used to calculate wave height and overflow volume, respectively, in storm surge simulation. The simulation results were compiled in inundation maps and computer graphic animations, and they were distributed to municipalities along the coast to promote tsunami and storm surge disaster prevention measures.
{"title":"Evaluation of Inundation and Damage Caused by Tsunamis and Storm Surges on the Coast of Okinawa Prefecture","authors":"T. Yamashita, Y. Nakamura, Eiki Miyagi, H. Oka, Yo-ichi Nishioka, H. Takeuchi, Takashi Kyan, Munehiro Hoshi","doi":"10.2208/PROCE1989.55.306","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.306","url":null,"abstract":"Numerical simulations for both tsunamis and storm surges on the coast of Okinawa Prefecture, which are expected to be the most dangerous cases, were conducted to evaluate the possible inundation area and potential damage. The detailed topographic model derived form filtered LiDAR observation data was applied to inundation simulation. Nonlinear long wave theory was used in tsunami simulation. The third generation wave spectrum model (SWAN) and VOF method (CADMAS-SURF) were used to calculate wave height and overflow volume, respectively, in storm surge simulation. The simulation results were compiled in inundation maps and computer graphic animations, and they were distributed to municipalities along the coast to promote tsunami and storm surge disaster prevention measures.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"49 1","pages":"306-310"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80706584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ocean-wave dependence of sea surface roughness is investigated using a wave boundary layer model, which is based ona recently obtained knowledge of air-sea interaction. The momentum flux is estimated by solving the model with meteorologicaland ocean wave information, which is obtained by carrying out the WRF and WWIII simulations. When windwaveis predominant, the results show clear relationships between Charnock coefficient and the wave age, between theroughness normalized by significant wave height z0/Hs and the wave age, and between the z0/Hs and the wave steepness.On the other hand, when swell is predominant, the results do not show clear dependence of Charnock coefficient on thewave age, and that of z0/Hs on the wave steepness, although that of z0/Hs on the wave age is observed.
{"title":"Evaluation of Ocean-Wave Dependence of Sea Surface Roughness Using Wave-Boundary Layer Model","authors":"Naoto Kihara, S. Ishihara, Hiromaru Chi","doi":"10.2208/PROCE1989.55.41","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.41","url":null,"abstract":"Ocean-wave dependence of sea surface roughness is investigated using a wave boundary layer model, which is based ona recently obtained knowledge of air-sea interaction. The momentum flux is estimated by solving the model with meteorologicaland ocean wave information, which is obtained by carrying out the WRF and WWIII simulations. When windwaveis predominant, the results show clear relationships between Charnock coefficient and the wave age, between theroughness normalized by significant wave height z0/Hs and the wave age, and between the z0/Hs and the wave steepness.On the other hand, when swell is predominant, the results do not show clear dependence of Charnock coefficient on thewave age, and that of z0/Hs on the wave steepness, although that of z0/Hs on the wave age is observed.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"101 1","pages":"41-45"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82689376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-10DOI: 10.2208/PROCE1989.55.1371
H. Gotoh, E. Harada, Yuta Maruyama, Kazuhide Takahashi, Keisuke Ohniwa
A typical town planning for disaster prevention is conducted according to following steps: i) pick-up of hazardous area from datum for a vulnerability to disaster given by a pilot survey, ii) analysis of land use, and iii) implementation of a scheme for construction of evacuation road or evacuation space. We propose a dynamic approach by using crowd refuge simulator for a disaster-prevention town planning. The crowd refuge simulator provides scenarios of evacuation dynamically in a virtual town.
{"title":"Contribution of Crowd Refuge Simulator to Town Planning against Tsunami Flood","authors":"H. Gotoh, E. Harada, Yuta Maruyama, Kazuhide Takahashi, Keisuke Ohniwa","doi":"10.2208/PROCE1989.55.1371","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.1371","url":null,"abstract":"A typical town planning for disaster prevention is conducted according to following steps: i) pick-up of hazardous area from datum for a vulnerability to disaster given by a pilot survey, ii) analysis of land use, and iii) implementation of a scheme for construction of evacuation road or evacuation space. We propose a dynamic approach by using crowd refuge simulator for a disaster-prevention town planning. The crowd refuge simulator provides scenarios of evacuation dynamically in a virtual town.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"265 1","pages":"1371-1375"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76273337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-10DOI: 10.2208/PROCE1989.55.1466
K. Kawanisi, M. Razaz, A. Kaneko, Toru Abe
The freshwater discharge is an important hydrological quantity on coastal planning, management, and environment conservation. In order to monitor the discharge in real time, an acoustic velocity meter (AVM) has been developed and deployed at a tidal estuary. The AVM installed at a shallow tidal river, where water depth and salinity change significantly, successfully measured the cross-sectional average velocity and discharge in a spring tide. In addition, the mean salinity was measured from the sound speed data of the AVM. The freshwater discharge was deduced from the discharge and salinity data.
{"title":"Measurement of Freshwater Discharge in an Estuary by Acoustic Tomography","authors":"K. Kawanisi, M. Razaz, A. Kaneko, Toru Abe","doi":"10.2208/PROCE1989.55.1466","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.1466","url":null,"abstract":"The freshwater discharge is an important hydrological quantity on coastal planning, management, and environment conservation. In order to monitor the discharge in real time, an acoustic velocity meter (AVM) has been developed and deployed at a tidal estuary. The AVM installed at a shallow tidal river, where water depth and salinity change significantly, successfully measured the cross-sectional average velocity and discharge in a spring tide. In addition, the mean salinity was measured from the sound speed data of the AVM. The freshwater discharge was deduced from the discharge and salinity data.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"19 1","pages":"1466-1470"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85424434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-10-10DOI: 10.2208/PROCE1989.55.1276
N. Touch, K. Komai, T. Hibino, S. Nakashita
In the previous studies, it was pointed out that mahogany clams live at the deeplayer (80cm from ground surface) of the tidal flat located at the midstream of Hiroshima's Ota River. It is believed that a current of water transports organic matter for food into the deep layer of the tidal flat. In this paper, a series of field observations and laboratory experiments was undertaken to look into the mechanism of organic matter movement under the effects of groundwater flow. In the field observations, variations in fines content and ignition loss provided evidence that organic matter was transported by groundwater flow to the deep layer of the tidal flat. From the laboratory experiment results, the permeability and the critical condition of organic matter movement were demonstrated with respect to the void ratioand velocity of the groundwater flow.
{"title":"Mechanism of Fine Particles Movement Caused by Groundwater Flow in Tidal Flat","authors":"N. Touch, K. Komai, T. Hibino, S. Nakashita","doi":"10.2208/PROCE1989.55.1276","DOIUrl":"https://doi.org/10.2208/PROCE1989.55.1276","url":null,"abstract":"In the previous studies, it was pointed out that mahogany clams live at the deeplayer (80cm from ground surface) of the tidal flat located at the midstream of Hiroshima's Ota River. It is believed that a current of water transports organic matter for food into the deep layer of the tidal flat. In this paper, a series of field observations and laboratory experiments was undertaken to look into the mechanism of organic matter movement under the effects of groundwater flow. In the field observations, variations in fines content and ignition loss provided evidence that organic matter was transported by groundwater flow to the deep layer of the tidal flat. From the laboratory experiment results, the permeability and the critical condition of organic matter movement were demonstrated with respect to the void ratioand velocity of the groundwater flow.","PeriodicalId":11343,"journal":{"name":"Doboku Gakkai Ronbunshuu B","volume":"27 1","pages":"1276-1280"},"PeriodicalIF":0.0,"publicationDate":"2008-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87793483","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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