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Evi Aprianti
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International Association of Lowland Technology In Collaboration with Hasanuddin University and Saga University Address Faculty of Engineering, Center of Technology Building, 1st Floor Jalan Poros Malino km. 6, Bontomarannu, Gowa Indonesia Postal Code: 91711
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Lowland Technology International
Published by International Association of Lowland Technology
ISSN : 13449656     EISSN : 21878870     DOI : https://doi.org/10.0001/ialt_lti
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Engineering Transportation
The Lowland Technology International Journal presents activity and research developments in Geotechnical Engineering, Water Resources Engineering, Structural Engineering, Transportation Engineering, Urban Planning, Coastal Engineering, Disaster Prevention and Mitigation Engineering.
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 463 Documents
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SOIL-WATER COUPLED ANALYSIS OF LOW LAND WIDESPREAD SUBSIDENCE DUE TO DEWATERING K. Kaneda; H. Yamazaki
Lowland Technology International Vol 11 No 2, Dec (2009)
Publisher : International Association of Lowland Technology

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Abstract

A series of numerical simulations of land subsidence due to dewatering were performed based on the soilwater coupled finite deformation analysis using the SYS Cam-Clay model under plane-strain conditions. The simulations showed that after land subsidence, the ground may be fragile in the event of additional loading due to disturbance of the soil structure. Ground settlement occurs with cyclic variation in ground water level, assumed to be seasonal, due to a history of water level change from extraction. Such behavior is the result of soil disturbance that occurs due to decay of the soil structure, resulting in the softening of soils through plastic volume compression.
THE SOCIAL COST OF TRAFFIC CONGESTION AIR POLLUTION (A CASE STUDY ON AHMAD YANI STREET, SURABAYA) A. Wicaksono
Lowland Technology International Vol 11 No 2, Dec (2009)
Publisher : International Association of Lowland Technology

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Abstract

At present, Indonesia is facing several problems related with transportation system, especially highway transportation system. The increase of population, followed by the increase of income per capita has caused a significant increase in the growth of motor vehicles in Indonesia, especially that of motorcycles which is very high. Ahmad Yani street is one of Surabaya City’s main entry access roads, of which the traffic burden is the highest. This traffic congestion surely causes high air pollution along the street. Therefore, a study on estimating social cost of air pollution caused by the densely motor vehicle traffic in Ahmad Yani street is considered necessary. The objectives of this study are not only (a) to analyse the peak-hour traffic performance, but also (b) to estimate the cost of air pollution caused by the emmision of motor vehicles in Ahmad Yani street. In this reserach, the methodology of Indonesian Highway Capacity Manual is used to analyse the traffic performance. Due to the inavailabity of Indonesian method, a US method is adopted to estimate the quantity of emission and the cost of air pollution. The cost of air pollution is measured based on the journey length and the average vehicle speed. The result of study shows that traffic congestion is very high in the morning peak hours (07.00-09.00) and is almost evenly happens along the Ahmad Yani street; at some points it even reaches the F level of service. Further result shows that the highest air pollution based on the journey length happens in segment III (GIANT Mall) on Thursday (May, 24th 2007; 07.00-09.00) reaching a cost of Rp. 246,575,690.-. The average vehicle speed is the highest in segment II (DOLOG Office) on Monday (May, 21th 2007; 07.00-09.00) reaching a cost of Rp. 254.431.756,-. In the case of segment II, if it is estimated that the ideal condition is the average speed of 40 kph (max speed allowed inside the city based on traffic law) then the cost of air pollution is Rp. 116.875.678,-, therefore the difference is Rp. 137.556.078,-. This implies that about Rp. 500 billion is needed annually for a one-way traffic. It is recommended that utilizing several measures in traffic management, such as road pricing, traffic divertion and frontage road development is necessary for the reduction of the cost of air pollution.
THE TIDAL/DIURNAL CYCLES OF THE NUTRIENTS EVOLUTION FOR MICROPHYTOBENTHOS ACTIVITY J-H. Lim; S. N. Longphuirt; A. Leynaert; P. Claquin; C-H. Koh; B-O. Kwon; S. An
Lowland Technology International Vol 11 No 2, Dec (2009)
Publisher : International Association of Lowland Technology

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Abstract

The objectives of this study were to investigate, the evolution of porewater nutrients in intertidal sediments over tidal and diurnal cycles, and the concentrations of nutrients to which the microphytobenthos are exposed during their vertical migration in the sediment. While porewater concentrations and their oscillation over tidal cycles have previously been measured, in our study we have included a high sampling frequency (2 hours) over a 2 day period. The tidal/diurnal cycle of dissolved inorganic nitrogen (nitrate+nitrite, ammonium), microphytobenthic biomass (Chl-a) and environmental parameters (temperature, light intensity, water depth) were studied on an intertidal flat in the Nakdong River estuary. We showed clear evolutions in the two nutrients which were significantly linked to the tidal cycle. Nitrate+nitrite showed an increasing trend in all depths during submersion periods, in contrast ammonium decreased, this resulted from the varying influence of diffusion and advection of overlying water. The microphytobenthos showed a normal migratory rhythm linked to the tidal cycle. Our result suggests that the evolution of porewater nutrients is mainly influenced by tidal cycle and the MPB activity may influence the nutrients evolution during emersion periods.
COMPARISON ON THE PERFORMANCE OF PREFABRICATED VERTICAL DRAIN (PVD) PRELOADING COMBINED WITH AND WITHOUT VACUUM AND HEAT J. Saowapakpiboon; D. T. Bergado; S. Artidteang
Lowland Technology International Vol 13 No 1, June (2011)
Publisher : International Association of Lowland Technology

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Abstract

This paper focus on performance of prefabricated vertical drain (PVD) preloading combined with and without vacuum and heat to accelerate the consolidation of soft Bangkok clay. The laboratory tests were conducted using reconstituted specimens in large scale consolidometers combined with and without vacuum and heat. The flow parameters were back calculated in terms of the horizontal coefficient of consolidation (Ch) and the ratio between the horizontal permeability in undisturbed zone (kh) to the horizontal permeability in smear zone (ks) or (kh/ks) based on Hansbo (1979) method. The back-calculation analysis results show that the combination of vacuum pressure and heat can increase the horizontal coefficient of consolidation, Ch of 126.42% and decrease of kh/ks of 63.33%. Furthermore, vacuum can increase higher rate of consolidation temperature can decrease viscosity of pore water by reducing the drainage retardation effects in the smear zone around the PVD which resulted in faster rate of consolidation and higher magnitude of settlement.
COMPREHENSIVE FLOOD MITIGATION AND MANAGEMENT IN THE CHI RIVER BASIN, THAILAND K. Kuntiyawichai; B. Schultz; S. Uhlenbrook; F. X. Suryadi; G. A. Corzo
Lowland Technology International Vol 13 No 1, June (2011)
Publisher : International Association of Lowland Technology

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Abstract

Severe flooding of the flat downstream area of the Chi River Basin occurs frequently. This flooding is causing catastrophic loss of human lives, damage and economic loss. Effective flood management requires a broad and practical approach. Although flood disasters cannot completely be prevented, major part of potential loss of lives and damages can be reduced by comprehensive mitigation measures. In this paper, the effects of river normalisation, reservoir operation, green river (bypass), and retention have been analysed by using integrated hydrologic and hydraulic modelling. Every tributary has been simulated by a process-based hydrological model (SWAT) coupled with the 1D/2D SOBEK river routing model. Model simulation results under the design rainfall event, i.e. flood depth, flood extent, and damages for the situation with and without flood mitigation measures have been compared and evaluated to determine an optimal set of mitigation measures. The results reveal that a combination of river normalisation, reservoir operation, and green river (bypass) is most effective as it can decrease the extent of the 100-year flood event by approximately 24% and 31% for the economic damage. The results of this study will be useful for improving the present flood defence practice in the Chi River Basin.
EVALUATION OF STORM SURGE MAP FOR SAFETY IMPROVEMENT IN BANGKOK METROPOLITAN REGION, THAILAND R. I-soon; D. Chaweewan; P. Iamtrakul
Lowland Technology International Vol 13 No 1, June (2011)
Publisher : International Association of Lowland Technology

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Abstract

Recently, there are a number of disaster occurred in several regions worldwide which might be caused of climate change effects. This damage alarmed many researchers to determine the possibility and risk. Bangkok Metropolitan Region (BMR) is low land area which is potentially flooding risk caused by river flood, flash floods and tropical storm in each year. Evacuation approach is necessary to response in disaster event, especially in low lying areas from the potential life-threatening effects of hazards to safe inland. According to study the local people’s perceptions of storm surge in Amphoe Mueng, Samut Prakarn, the result was shown that most samples evacuate to outside Samut Parakarn area by their own vehicles and evacuate immediately when they have been warned from the government. This paper proposed two main objectives which area; 1) Evaluate Risk level of storm surge and relevant hazard in Bangkok Metropolitan Region (BMR) and 2) Evaluate potential evacuation by overlay between building density in Bangkok Metropolitan Region and road network. Geographic Information System (GIS) was employed to analyze hazard risk level with Spatial Analysis technique.
FLOOD INUNDATION MODELING FOR KOTA TINGGI CATCHMENT BY COMBINATION OF 2D HYDRODYNAMIC MODEL AND FLOOD MAPPING APPROACH M. R. M. Adib; M. B. Saifullizan; T. Wardah; D. Rokiah; A. Junaidah
Lowland Technology International Vol 13 No 1, June (2011)
Publisher : International Association of Lowland Technology

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Abstract

Flood inundation model in lowland catchment area plays an important role in flood management. This paper describes the development of flood inundation model where Kota Tinggi catchment has been chosen as the case study. This model is built using InfoWorks River Simulation (RS) and it is combined with flood mapping techniques. This model is calibrated using historical flood event on 12th January 2007. It is found that the water level of the river overflows due to heavy rainfall on January 12th 2007, and the highest rainfall data of 50.8mm was recorded. The outflow hydrograph from the breach was estimated to perform inundation simulation. Flood inundation simulation shows that the water spread out through the Kota Tinggi catchment and the maximum inundation depth was above 10 m. The results of this research will benefit future modeling efforts by providing a tool for hydrological forecasts of flooding on lowland areas. While designed for the Kota Tinggi catchment, this model may be used as a prototype for model applications in other areas of the country.
INFLUENCES OF PUBLIC BICYCLE ON URBAN PUBLIC TRANSPORT： A STUDY ON HANGZHOU CITY, CHINA C. B. Wang; K. Hokao; L. Gao
Lowland Technology International Vol 13 No 1, June (2011)
Publisher : International Association of Lowland Technology

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Abstract

With the rapid progress of urbanization, urban transportation problem has become a bottleneck that limits sustainable urban development all over the world. The promotion of urban public bicycle provides a new way for the city government to achieve the goal of public-transport-prior strategy and thus solve traffic problem to some extent. The paper took Hangzhou city as an example to discuss the existing problems, and then based on the analysis of urban bicycle role, proposed some measures to optimize the development of urban public transport system.
MEASURED BEHAVIOR OF A TRIAL EMBANKMENT ON FLOATING COLUMN IMPROVED SOFT ARIAKE CLAY DEPOSIT Y. Igaya; T. Hino; J.-C. Chai
Lowland Technology International Vol 13 No 1, June (2011)
Publisher : International Association of Lowland Technology

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Abstract

A 6.5m height trial embankment was constructed on soft Ariake clay deposit improved by the floating soil-cement columns. At the test site, the thickness of the soft soil was about 10 m, and the length of the column was 8.5 m and the area improvement ratio was about 31%. To check both the mechanical and geoenvironmental performance, the embankment was monitored for more than 2 years. The measured results indicate that the behavior of the trial embankment satisfies the performance requirements for constructing a highway around Ariake Sea, in Kyushu, Japan, i.e. settlement and lateral displacement at the toe of the embankment are less than 50 mm, and residual settlement is less than 0.3 m. The observed results also show that the column improvement not only reduced the settlement but also accelerated the consolidation rate of the deposit. The results of groundwater monitoring indicate that at the test site, in terms of groundwater level, flow velocity, pH value and the concentrations of some key ions, there was no effect on the groundwater quality due to the installation of soil-cement columns into the ground.
PROPOSAL OF METHOD OF EVALUATING LOCATION RISK OF WELFARE FACILITIES IN DISASTER T. Nagaie; A. Tanoue; K. Hokao; T. Inohae; H. F. Li
Lowland Technology International Vol 13 No 1, June (2011)
Publisher : International Association of Lowland Technology

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Abstract

At the disaster, special consideration is necessary for vulnerable people, the place in which they gather is dangerous. Therefore, it is necessary to think about disaster prevention and the disaster mitigation measures that vulnerable people can live safely. And it pays attention to the location place of the welfare facility and the method of evaluating the location risk of the welfare facility in the disaster is examined It pays attention to the characteristic of the welfare facility manager in facilities, people in facilities and person who lives in the vicinity of facilities. It aims to think disaster prevention and disaster mitigation measures. The present study did the analysis and the site investigation by GIS and, in addition, executed the hearing investigation to the object municipality. Moreover, the evaluated space level was set, the disaster location risk of each space level was evaluated, and consideration and the examination of the evaluation examined disaster prevention and the disaster mitigation measures furthermore. The method of evaluating five was made for the earthquake flood damage and the sediment disaster. The method of evaluating five was applied to the vicinity of the welfare facilities of Saga City, and it evaluated it. As a result, it has understood the location in a dangerous place in view of the disaster. The problem of examination of safety for the life after it had taken shelter as a disaster mitigation measures not to expand disaster of it arose.

Page 21 of 47 | Total Record : 463

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