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Ryoichi Yanagawa

Ryoichi Yanagawa
National Institute of Technology, Kagawa College · Civil Engineering

Ph.D.

About

32
Publications
1,046
Reads
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27
Citations
Introduction
Dr. Yanagawa completed his M.Eng and PhD (Coastal Ecosystem) from Osaka City University, Japan. He joined Chuden CTI Co., Ltd.(2004.4-2012.4) as the Coastal Ecosystem Engineer & IT Engineer. On 2012, he moved to Iwate University and worked as the assistant professor at the dept. of natural disaster analysis. He executed various researches related to the tsunami disaster management(2012.5-2016.3). Now, He got new post in Kagawa College and launched the Coastal Region Engineering Lab. (CREL).
Additional affiliations
April 2016 - March 2017
National Institute of Technology, Kagawa College
Position
  • Lecturer
May 2012 - March 2016
Iwate University
Position
  • Professor (Assistant)

Publications

Publications (32)
Article
Full-text available
Active association with interdisciplinary fields and deepening mutual understanding are required in higher education in today's fast-changing social situation. Thus, a special subject, "Introduction to Engineering Frontier" that is mindful of domestic and international business was created. The subject has been offered jointly by the National Insti...
Article
A demonstration experiment of a V-shaped portable fishway was conducted in rivers. Results of the experiment confirmed that the fishway is effective for the upstream mingraiton of eight species of diadromous aquatic animals. In addition, the flow velocity mesurement under multiple flow conditions clarified that the gentle flow field was formed alon...
Article
Full-text available
This study examined the regional spatial characteristics of tsunami flooding and building damage using geographic information systems. An analytical model that evaluates total building destruction risk was developed using building damage data from coastal areas in Iwate Prefecture. Building density characteristics in the study area were categorized...
Article
Full-text available
To prepare a more practical evacuation plan to combat unprecedented multiple disasters, the tsunami numerical model was developed and a GIS analysis of tsunami evacuation behaviour after the Great East Japan Earthquake was conducted at the Otsuchi coastal region. The arrival time and the inundation process of tsunami between Ando and Kirikiri distr...
Article
Full-text available
The Great East Japan Earthquake of 11 March 2011 unleashed a powerful tsunami that struck the coastal region and left death and extensive destruction in its wake. This event prompted many investigations to assess the damage and the extent to which the tsunami affected areas along and adjacent to the coast. In this paper, we use aerial photography a...
Article
In order to evaluate the risk of tsunami evacuation route in the snow season against the slip and rollover caused by fallen snow, the clarification of meteorological characteristics in Iwate coastal area and some analyses related to the tsunami evacuation routes of 3 schools were implemented. At the coastal area, the surface temperature decreased m...
Article
In this study, we coupled a three-dimensional hydrodynamic model with an ecosystem model and applied it to the shallow complex floodplain wetland of Chini Lake in Malaysia. Our objective was to provide a better understanding of the lake’s ecosystem dynamics under different forcing mechanisms. Simulations and validation were performed over a dry mon...
Article
Full-text available
From tsunami run-up borderline of the Great East Japan Earthquake Tsunami determined from aerial photographs, altitude by laser scanning location & altitude survey and site reconnaissance, tsunami run-up height was estimated and considered its accuracy. The possibility of tsunami run-up height was higher than existing field survey results has sugge...
Article
In order to clarify the regional characteristics and tsunami damage by The Great East Japan Earthquake Tsunami in 2011, the various field data collected by various institutes were arranged in a cross-sectoral manner and examined the features. At the most of the coastal area, tsunami inundation area was almost the same as the low-lying area. While t...
Article
In order to clarify the tsunami inundation and onshore building damage by Tsunami attack, the inunda-tion height estimated by the tsunami numerical model and building density given by GIS analysis were focused on and analyzed. Building group destruction probability model was developed, and validated at the Iwate coastal areas. By using this probabi...
Conference Paper
Full-text available
The estimated tsunami height and inundation depth in March 11th, 2011 were shown and geographically analyzed. The spatial distribution of tsunami inundation and its height were visualized with GIS, and regional characteristics of representative areas were spatially examined. Considering the spatial distribution of inundation area, depth and house d...
Article
Coastal topographical change around the great east japan earthquake (GEJE), tidal flooding area with inundation height estimated by the observation data, tidal flooding frequency with its height at the widespread coastal area by the numerical modeling of hydrodynamics were examined at the Iwate coast. At the target 4 fishing ports, the waterfront a...
Article
The field observation and the numerical model study was carried out to comprehend the sea-cultivated sediment particle behavior. It became clear that the curled up soil particles were transported downstream and diffused to the water mass. From the hydrodynamic model including turbidity calculation, the distribution of sediment particle was strongly...
Article
Based on survey on current conditions data of buildings damage for 2011 Tohoku earthquake and tsunami, we comprehend the status of buildings damage and clarify its characteristics of 12 municipalities in coastal areas of Iwate prefecture. As a result, the most structure of building was wooden buildings and amounted to 59 percent.95 percent of the w...
Article
Around a river mouth at open coastal zone, complicated flow fields arise from interactions between waves, tidal and fluvial currents. To estimate sediment budget around river mouth, it may be important to investigate the current field. In this study, spatio-temporal properties of the currents off the Tenryu River mouth on the Pacific Ocean are disc...
Chapter
Full-text available
Applying numerical analysis models to the Nanko area of Osaka Bay, we calculated dissolved oxygen displacement affected by power plant discharge in the summer when the bottom layer was hypoxic. The power plant discharge was found to increase the oxygen supply from the upper layer to the bottom layer during July and the first half of August. On the...
Article
Using the numerical analysis models in Osaka Bay and the Nanko area, we calculated the 3-dimensional distribution of dissolved oxygen concentration (DO) in the summer when the bottom layer was in the hypoxic condition. In order to verify the model reproduction of DO, model results were compared to the observations. We also studied about the relatio...
Article
In order to reproduce changes of the dissolved oxygen concentration in summer in the vicinity of the Nanko thermal power plant, located in the inner part of Osaka Bay, a numerical simulation model was developed. According to the model results, daily fluctuation of dissolved oxygen concentration in the surface layer is high in June, the early strati...
Article
Nitrogen budgets and fauna of benthic organisms were examined at the pond of Osaka Nanko Bird Sanctuary, an artificial tidal flat of Hannan Second District and the natural tidal flat of Wakagawa estuary. These salt marsh and tidal flats, each locates at urban areas, are thought to be a typical ecosystem maintained by artificial environmental manipu...
Thesis
Full-text available
The overall study of the aquatic organism’s habitat, the water purification and the nutrient circulation potential of the artificial salt marsh ecosystem located at the eutrophicated urban river mouth area
Article
Problems and Approach for their Solution of the Lagoon Type Salt Marsh Constructed in the Vicinity of Urban Area
Article
Budget of Nutrients and Evaluation of Water Purification Ability at the North Pond of Nanko Bird Sanctuary
Article
Field studies to clarify the nitrogen budget of artificial salt marsh were carried out at the north pond of Osaka Nanko Bird Sanctuary in June, August, October of 2001 and March, May of 2002. The study site is located at eutrophicated inner Osaka Bay, Japan. According to the seasonal observations, decrease of dissolved inorganic nitrogen con-centra...
Article
Budgets of nitrogen, suspended solids and chlorophyll a were studied in September 2000 and June, August, September and October 2001 at the north pond of Nanko Bird Sanctuary and at an artificial tidal flat of Hannan Second District, Osaka Bay, Japan. At the north pond of Nanko Bird Sanctuary, the output of suspended solids to coastal water exceeded...
Article
The budgets of nitrogen, suspended solids and chlorophyll a were studied in June, August and October 2001 at the north pond of Osaka Nanko Bird Sanctuary. The output of suspended solids to coastal water exceeded its input to the pond, while chlorophyll a was intercepted within the pond through tidal exchange. The dissolved inorganic nitrogen import...
Article
Environmental Characteristics and Conditions to Enhance the Biological Diversity in a Salt Marsh of Osaka Nanko Bird Sanctuary
Article
Environmental Characteristics and Temporal Changes of Demersal Fishes and Crustaceans in Inner Osaka Bay

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