Hydraulic Performance of Composite-Type Seawalls Applied in Malaysia

• Main Author: Ab. Qahar, Nabilah
• Format: Final Year Project
• Language: English
• Published: Universiti Teknologi PETRONAS 2007
• Subjects: T Technology (General); TA Engineering (General). Civil engineering (General)
• Online Access: http://utpedia.utp.edu.my/9809/1/2007%20Bachelor%20-%20Hyraulic%20Performance%20Of%20Composite%20-Type%20Seawalls%20Applied%20In%20Malaysia.pdf; http://utpedia.utp.edu.my/9809/

This is a report on the Final Year Project titled 'Hydraulic Performance of Composite- Type Seawalls Applied in Malaysia'. Composite-type seawalls were stacked armour stones or wave dissipating blocks fronting the vertical seawalls to reduce waves overtopping. Under certain weather condition and storm action in Malaysia, waves overtopping would be frequent and violent where hinterlands are prone to the risk of flooding and damaged to infrastructures. The objectives ofthis project were to study the existing types of composite seawalls applied in Malaysia and conduct risk assessment on the selected composite seawalls. Three models are fabricated which were concrete block, composite seawalls using quarrystones and concrete cubes as armour units. The models were constructed ona scale of 1:15 using concrete mortar. Tests were conducted in a flap-type wave generator in the UTP Hydraulic Engineering Laboratory. First part of the project only highlights two preliminary tests which were the determination of wave period, Twith respect to frequency,/and determination ofincident wave height, Hiwith respect to wave period, Tin four different water depths (18, 20, 22 and 24 cm). The results were used in the second part of the project which was the determination of overtopping rates, qfor three different models of seawalls for d= 18, 20,22 and 24 cm. The overtopping rates were then analyzed with respect to wave steepness, H/gf and incident wave height, Hh It is founded that q increased as Ht and dincreased. Then risk assessment on pedestrians, vehicles, buildings and embankment seawalls are made. The tolerable overtopping rates developed by Owen (1994) are used as guidelines to the assessment. Observed from the assessment, the waves overtopping values were hazardous to pedestrians, vehicles and buildings. As for embankment seawalls, the values cause no damage. It is concluded that overtopping rates are influenced by Hi and dwhile further research can be done in order to minimize the hazards to pedestrians, vehiclesand buildings