scholarly journals DISASTER PREVENTION COASTAL MAP PRODUCTION BY MMS & C3D

2016 ◽  
Vol XLI-B1 ◽  
pp. 595-599
Author(s):  
Shuhei Hatake ◽  
Yuki Kohori ◽  
Yasushi Watanabe
Keyword(s):  
Water Area ◽  
Coast Guard ◽  
Tokyo Bay ◽  
Disaster Prevention ◽  
Land Area ◽  
Geographical Survey Institute ◽  
Tidal Zone ◽  
Cloud Data ◽  
Tsunami Waves ◽  
Osaka Bay

In March 2011, Eastern Japan suffered serious damage of Tsunami caused by a massive earthquake. In 2012, Ministry of Land, Infrastructure and Transport published “Guideline of setting assumed areas of inundation by Tsunami” to establish the conditions of topography data used for simulation of Tsunami. In this guideline, the elevation data prepared by Geographical Survey Institute of Japan and 2m/5m/10m mesh data of NSDI are adopted for land area, while 500m mesh data of Hydrographic and Oceanographic Department of Japan Coast Guard and sea charts are adopted for water area. These data, however, do not have continuity between land area and water area. Therefore, in order to study the possibility of providing information for coastal disaster prevention, we have developed an efficient method to acquire continuous topography over land and water including tidal zone. Land area data are collected by Mobile Mapping System (MMS) and water area depth data are collected by interferometry echo sounder (C3D), and both data are simultaneously acquired on a same boat. Elaborate point cloud data of 1m or smaller are expected to be used for realistic simulation of Tsunami waves going upstream around shoreline. Tests were made in Tokyo Bay (in 2014) and Osaka Bay (in 2015). The purpose the test in Osaka Bay is to make coastal map for disaster prevention as a countermeasure for predicted Nankai massive earthquake. In addition to Tsunami simulation, the continuous data covering land and marine areas are expected to be used effectively for maintenance and repair of aged port and river facilities, maintenance and investigation of dykes, and ecosystem preservation.

scholarly journals A new approach to increase land reclamation rate in coal mining subsidence area: A case study of Guqiao Coal Mine, China

2021 ◽  
Author(s):  
Gensheng LI ◽  
Jianxuan Shang ◽  
Zhenqi Hu ◽  
Dongzhu Yuan ◽  
Pengyu Li ◽  
...  
Keyword(s):  
Coal Mining ◽  
Coal Mine ◽  
Land Reclamation ◽  
Water Area ◽  
Land Area ◽  
Reclaimed Land ◽  
Land Protection ◽  
Mining Areas ◽  
Concurrent Mining And Reclamation ◽  
Coal Mining Subsidence

Underground coal mining will inevitably cause land ponding in high groundwater table, which will affect the land sustainable development. However, the traditional reclamation (TR) is poor in land rate. Thus, finding a suitable reclamation approach is crucial to alleviate the conflicts between coal exploitation and land protection. In this paper, taking Guqiao Coal Mine of China was seriously affected by mining-induced ponding as an example. Firstly, dynamic distribution of surface subsidence and land damage from 2007 to 2017 was revealed base on concurrent mining and reclamation (CMR). Second, the land-water layout of five reclamation schemes (no reclamation, TR, CMR I, CMR II and CMR III) were simulated. Then, and the dynamic filling elevation model and filling thickness model were constructed. Finally, the sequence of earthwork allocation was optimized. The results revealed that: 1) reclaimed land area: CMR III > CMR II > CMR I > TR > no reclamation; 2) The digging depth is directly proportional to earthwork volume and land area, and inversely proportional to water area, but with increase of digging depth, the increase in the reclaimed land area relatively slowed down; 3) CMRs had reclaimed 426.31~637.82 ha and 259.62~471.13 ha more than the no reclamation and TR respectively. Compared with the no reclamation and TR, CMRs can increase the proportion of reclaimed land by 33.77~50.52% and 20.57~37.32% respectively. The research results provide a reference to increase the reclamation rate of mining areas in the high phreatic table.

scholarly journals Storm Surge Hazard Assessment of the Levee of a Rapidly Developing City-Based on LiDAR and Numerical Models

2020 ◽  
Vol 12 (22) ◽  
pp. 3723 ◽  
Author(s):  
Qingrong Liu ◽  
Chengqing Ruan ◽  
Jingtian Guo ◽  
Jian Li ◽  
Xihu Lian ◽  
...  
Keyword(s):  
Storm Surge ◽  
Hazard Assessment ◽  
Point Cloud ◽  
Numerical Models ◽  
Ocean Model ◽  
Economic Losses ◽  
3D Point Cloud ◽  
Point Cloud Data ◽  
Disaster Prevention ◽  
Cloud Data

Rapidly developing cities could require an urgent hazard assessment to ensure the protection of their economy and population against natural disasters. However, these cities that have rapidly developed should have historical records of observations that are too short to provide sufficient data information for such an assessment. This study used ocean numerical models (i.e., Finite-Volume Community Ocean Model (FVCOM) and Parabolic Mild-Slope Wave Module (MIKE 21 PMS) to reconstruct data for a storm surge hazard assessment of the levee at Weifang (China). LiDAR (Light Detection and Ranging) data were also used to obtain 3D point cloud data and the structure of the levee. The designed levee height was calculated based on the simulations and 3D point cloud data, and the results were compared with measured heights to evaluate whether the levee is sufficiently high to satisfy the safety requirement. The findings of this work will enhance the marine disaster prevention capacity of the region and could help reduce economic losses associated with marine-related disasters. The results could also provide support for future work on disaster prevention in the field of coastal marine engineering.

Dynamic Analysis of Small Scale Floating Structure by Ship Wave Force

2009 ◽  
Author(s):  
Hiroaki Eto ◽  
Shigenori Yuasa ◽  
Kohei Wada ◽  
Osamu Saijo ◽  
Kiyotaka Ohki
Keyword(s):  
Numerical Calculation ◽  
Dynamic Behavior ◽  
Wave Height ◽  
Water Area ◽  
Tokyo Bay ◽  
Small Scale ◽  
Wave Forces ◽  
Floating Structure ◽  
Ship Waves ◽  
Ship Wave

A floating structure has many options for effective ocean space utilization, for instance, the well known floating airport project, called Mega-Float. But after the end of the project, small scale floating structure began to be paid to attention. As the good example of such a kind of floating structure, there is the floating restaurant named “WATERLINE” (Figure 1) in Tokyo Bay. “WATERLINE” is small scale floating structure, and it is moored at the Tennoz Canal that is the closed water area. Therefore, when the ship passes around the floating restaurant, ship wave forces give a great influence on dynamic behavior of floating restaurant. As for ship waves, several studies have been made on the wave resistance and influence on ship handling concerning ship waves, but it is hardly to find papers focused on influence that ship wave forces give to dynamic behavior of small scale floating structure. In this research, dynamic behavior of small scale floating structure by ship wave forces was studied through both theoretical and experimental approach. As for the theoretical analysis, the equations of the Boussinesq type to treat shallow water area were adopted, and ADI (Alternating Direction Implicit) method in a numerical calculation was used for the analysis of these equations. And the floating structure was assumed to be a rigid body, and the displacement responses by ship wave forces were analyzed. With regard to experimental study, dynamic behavior of “WATERLINE” and wave height by the ship wave were actually measured. This measurement data is a profitable basic data for other researchers and engineers in order to analyze a floating structure. In the present paper, the validity of the numerical calculation program for ship wave response analysis was verified by the comparison between calculation results and the measurement results, the characteristics of the displacement response and the wave height were discussed by the numerical results that had been obtained by changing by the ship’s speed and the distance between floating structure and the ship. In addition, the evaluation of habitability in vertical motion of the small scale floating structure at the canal was examined by the diagram proposed from our research results [1], [2]. And, in regard to the ship that passes over around floating structure, ship’s speed limit and minimum distance between the ship and the floating structure were proposed.

Research Regarding the Conceptual Change Observed in the Sea City Concept

2018 ◽  
Author(s):  
Ryo Sugahara ◽  
Akio Kuroyanagi
Keyword(s):  
Water Area ◽  
Tokyo Bay ◽  
City Image ◽  
Offshore Area ◽  
The People ◽  
Big Cities ◽  
New City ◽  
Floating Type ◽  
Industrial Zones ◽  
City Plan

From the 1960th to 1980th years in the second half of the 20th century, numerous “sea city concepts” were proposed as a new city image. Among these concepts, in Japan, the sea city concept reflecting the current urban development situation of that time, was drawn by the architects as an image of the ideal city. During that period, in Japan for the purpose of the further economic development, the landfilled industrial zones were created in the surroundings of large metropolitan areas of Tokyo, Osaka and Nagoya. It led to the concentration of the population due to the people fleeing to the big cities from the provinces for employment, which created various problems of big cities such as population overcrowding, land shortage, traffic jams, air pollution, etc., so the different tasks became apparent. As a way to solve such problems, a sea city plan has been proposed. The oldest initiative was the Tokyo Bay concept of 1958 which proposed the creation of a new city by creating a new land by landfilling Tokyo Bay. However, that initiative only covered the expansion of the existing land, and didn’t make any advantage of “ocean” resources. For that reason, the further proposals subsequently enabled taking advantage of the sea by creating the canals, artificial islands or pile-style structures which led to adoption of proposal to float up. After that, the sea city concepts basing on the floating type had increased, and the subjected water area transited from the shallow water to the offshore area. Furthermore, the authors are planning to arrange the process of transition of the concept of the sea city by taking into account the changes the way oceans are treated and the structures relative to time.

scholarly journals TSUNAMI HAZARD ASSESSMENT IN THE CASPIAN SEA

2019 ◽  
Vol 47 (5) ◽  
pp. 74-88
Author(s):  
E. A. Kulikov ◽  
A. Yu. Medvedeva ◽  
I. V. Fine
Keyword(s):  
Hazard Assessment ◽  
Caspian Sea ◽  
Water Area ◽  
Tsunami Hazard ◽  
Estimation Of Parameters ◽  
The Caspian Sea ◽  
Tsunami Waves ◽  
The North ◽  
Tsunami Hazard Assessment ◽  
Run Up

The article describes the tsunami hazard assessment for the coast of the Caspian Sea, in particular for the Absheron Peninsula. Due to the high socio-economic load on the coast of this region by electric power and oil production industries requirements, it is necessary to take into account risks even for such extremely rare natural phenomena like tsunamis. An earthquake with M = 8 ± 0.2 can occur throughout the Caspian Sea region, including land, once every 216 years, while for the water area the frequency of occurrence of such an event is 1620 years. The article presents the results of a tsunami hazard assessment based on a deterministic approach for the Absheron Peninsula. This approach of the tsunami hazard assessing of an arbitrary part of the coast consists of selecting of the strongest observed (or hypothetical) tsunami event from a neighborhood and from a distant zone, of the subsequent estimation of parameters for model sources and, finally, of the numerical modeling of tsunami generation and propagation from these sources. It was obtained that with the propagation of tsunami waves from the north to the coast of the Absheron Peninsula, its height can reach 3‒4 m for some parts of the coast with run-up 500‒1500 m.

scholarly journals Origin of NOx emission from ships inside major bays in Japan

2015 ◽  
Vol 18 (4) ◽  
pp. 5-13
Author(s):  
Akihiko AZETSU
Keyword(s):  
The Other ◽  
Nox Emission ◽  
Tokyo Bay ◽  
Work Time ◽  
Osaka Bay ◽  
Ise Bay ◽  
Other Hand ◽  
Wide Range ◽  
Reduction Of Nox ◽  
Main Engine

The amount of NOx emission from ships inside the major bays in Japan, i.e., Tokyo Bay, Osaka Bay and Ise Bay, are analyzed and the strategies in the reduction of NOx emission are discussed. Normally each ship has three sources of NOx emission, i.e., main engine, auxiliary engine and auxiliary boiler. Since wide range of ships are in operation in these bays, each of the ships are categorized in 4 ranks by the size of each ships. The amounts of NOx emission from each source and each rank of ships are estimated separately and compared with each other to understand the origin of NOx emission inside these bays. From the systematic calculations, it was explored that more than half of the amount of NOx was emitted from the auxiliary engines during the anchorage period. Especially the influence of the NOx emission from auxiliary engines of larger sized ships of rank 4, the largest category, is the largest. This should be mainly due to the longer anchorage and cargo work time necessary for handling the larger amount of cargo of larger sized ships. On the other hand the NOx emission from main engines is mainly emitted from the small sized ships of rank 1. Same tendencies are obtained through the NOx emission calculations of three major bays in Japan. From these results, it is suggested that the usage of land electricity in larger sized ships is effective in the reduction of NOx emission in major bays.

EVALUASI PENATAAN KAWASAN AMAN AKIBAT BENCANA TSUNAMI ACEH 26 DESEMBER 2004 CONTOH KASUS DI PANTAI KOTA MEULABOH, KABUPATEN ACEH BARAT

2012 ◽  
Vol 11 (1) ◽  
Author(s):  
Heru Sri Naryanto
Keyword(s):  
Strong Earthquake ◽  
Earthquake Epicenter ◽  
Land Area ◽  
Coastal Planning ◽  
Tsunami Waves ◽  
The Earth ◽  
The People ◽  
Recreation Areas ◽  
Richter Scale ◽  
The Indian Ocean

An exceptionally strong earthquake with magnitude 9 on the Richter scale struck Aceh on December 26, 2004 at 07.59 local time, followed by a very big tsunami. The earthquake epicenter was located about 149 km south of Meulaboh City in the Indian Ocean. The tsunami waves travelled at a speed of + 500 km/hour. Entire strips along west coast of Meulaboh City was wiped clean from surface of the earth, many people were reported dead or missing in Meulaboh. Houses, office andbusiness buildings, roads, recreation areas, utilities, and other infrastructure elements were devastated, damaged, or made useless from the coastal line until 2km to the land area. The coastal planning for sustainable development of tsunamiin the area is needed for reducing the damages and saving the people life.

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