別紙41 (課程博士(英文))Date of submission (month day, year)

July 11,2019
Sh喰eru Kato

Department
Architecture andStudentlD NumbeT

Civil En牙ineerin客Pplicant's nameTakanobu lnoe

D169502
Supervisors

Kuriko Yokota

TeukuMuhammadRasyif

Abstract (Doctor)
Title ofThesis

Numerical study on Tsunami Disastel' Mitigation al'ound Aceh province,1ndonesia

Approx.80o words〆'゛4︑

Dreadful damages was caused by tsunami waves in several coastal areas in this world.
EspeciaⅡy tsunamiin 2004, the tsunami σave damaoe to in介astructures in coastal area andCaused about 230,ooo numbers of human casualties at several countries such as lndonesia、 sriLangka, Thailand, and lndia. one decade after the 2004 tsunami, about seven big earthquake
Such as the Nias and simeulu tsunalni on 2005, Mentawaiisland tsunami on 2010, and on

20】 2 have been occurred in sumatra subduction zone. That tsunamis caused diff引'ent impact
in lndonesia especiaⅡy along the coastal al'eas of Aceh province. The reaected tsunami 圦,avein pulo Raya lsland during the 2004 tsunami able to caused massive impact to、刃ard the lee
Side ofthe island. The tsunami、vave amplification have been happened to、¥ard several
Cities in 、Nestern coast of Aceh such as Meulaboh, Tapaktuan, and singkⅡ due to innuence of
Sma11island that located in 介ont of the cities

jgミ︑The tsunami、和aves also have caused significantly morph010oical changes in coastal area suchas could separate a mainland and leave the smaⅡ amount of the mainland at the sea 、vhich

Change it become a ne、N smaⅡ island. This indicated the tsunami waves have the stl'ong force、和hich it could be erode the sediment at the bottom of the sea and the land. The form ofdark‑murky water 、Nhich 、vitnesses by the local community who survive 介om the lndian

Ocean Tsunami evidences that tsunami waves 、¥hich come to the shore bl'ought the large
n山11ber of sediment to mainland while run‑UP.

F0110wing this series oftragic events,、Nhich caused huge losses of life and enormous damage
to in介astructure, several researchers developed a Π山nerical model t0 σain a σreater
Understanding of tsunami wave procesS 介oln its genel'ation untⅡ inundation to the coastal

areas. The numerical simulation becomes one method which widely 、Nas used by several
researchers to investigate tsunami wave impact towal'd the coastal area. Therefore, several
mitigation process 、Nere derived 介oln the silnulation results such as estimated of inundation

area (EIA) and estimated time of arrival(ETA). The EIA and ETA data were used by sevel'alCountry to create tsunami haZ引'd map and incorp01'ate 、Nith the tsunami early warning system
However, other tsunami mechanism such as sediment transport is rather not consider in thetsunami simulation model. The sediment transport is one of important things in process oftsunami mitigation such as to study about the coastal morph010gical changes, recovery
Process after tsunami, and tsunami deposit

Chapter one i11Ustrates the impact 介om tsuna1Υli、Nave toward coastal area of Aceh province.
The previous studies on tsunami、Nave impact, the reaected 、ヘノave effect, the smaⅡ island
innuence, and morph010gical changes are summarized{n chapter T、NO, a generalinformation about numerical model and equations such as shaⅡOW、Nater, sediment transport, and bottom level changes formula that applied are summarized
Several clties in Aceh province such as the western coast of Aceh province and pulo Rayaisland as a large domain and Banda Aceh as a smaH domain 、刃ere used as study case. TheIarge domain was investigated by observing the 、和ave propagation process to、和ard the coastal
area by usinσ the coMCOT model, The coastal morph010gical changes was investigated byCoupling a hydrodynalnic model with a sediment transport module on Banda Aceh city as theSmaⅡ domain. The corneⅡ Multigrid coupled Tsunami Model(COMCOT)、vas coupled withthe xBeach Model to simultaneously simulate sediment transport and the hydrodynamic
Process during the tsunami. The coupled modelis known as coMCOT・SED.
In chapter Three, the numerical simulation of the 2004 1ndian ocean Tsunami 、Nere
Validated, analyzed, and discussed. The sateⅡite measurement,6eld observation, andgeospatialinformation data 、vere applied to validate the simulation results for large and sma11
domain. The l'esults show that the simulation results have a good agreement with theObservation data. The propagation process results also show different characteristic to、Nard
the western cities and pulo Raya island as the large domain. The coMCOT・SED model
indicated that coastal area of Banda Aceh city as the sma11 domain received massive
morph010gical changes impact due to the 2004 tsunami
In chapter Four、 the inauence of the smaⅡ island against tsunami、Nave is investigated through anumerical si111Ulations. past and hypothetical ea11hquake have been applied to investigate theinauence of the smaⅡ island. sma11 Changes of the location of epicenter in future tsunami 、和i11
result in di仟erent tsunamiimpact along sumatra lsland due to the inauence of smaⅡ island. The
hydrodynamic processes of reaected tsunami、刃aves and their impact on pulo Raya lsland are also
investigated 、Nith the numerical model. The simulation conflrms eye、Nitness accounts that it 、Nas
notthe initial run、UP, butthe reaected waves that devastated the 、Norst・hit areas ofthe island
In chapter Five,111ajor findings, conclusions, and recommendation obtained in this study areSUITlmarized/