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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 17 Documents
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Search results for , issue "Vol 20 No 2, Sep (2018)" : 17 Documents clear
Strengthening of RC members using post-tensioned metal straps: state of the research T. Imjai; U. Chaisakulkiet; R. Garcia; K. Pilakoutas
Lowland Technology International Vol 20 No 2, Sep (2018)
Publisher : International Association of Lowland Technology

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Abstract

This article reviews the state of the research on a novel and cost-effective strengthening technique for substandard reinforced concrete (RC) structures that uses Post-Tensioned Metal Straps (PTMS). The technique applies active confinement around RC structures by post-tensioning metal straps using steel strapping tools as those used in the packaging industry. The literature survey in this study indicates that some research has been carried out in strengthening normal and high-strength concrete cylinders, columns, lap-spliced elements, beams in flexure, beams and joints in shear, as well as full-scale structures tested on a shake table. Analysis and design models also exist, thus indicating that the technique is reaching maturity. Overall, the experimental results available in the literature indicate that the use of PTMS strengthening is very successful at enhancing the capacity and ductility of structures. Consequently, the PTMS provide a fast and cost-effective strengthening solution in comparison to the other traditional strengthening methods. This study contributes towards a better understanding of the potential use of the PTMS technique as strengthening/retrofit solution, as well as towards highlighting future research needs. Ongoing research work on PTMS at Rajamangala University of Technology Tawan-Ok is also summarised and commented upon.
Prioritizing rural roads projects in nort-eastern Tailand by analytical hierarcy process (AHP) P. Cheonklang; I. Phummiphan; S. Horpibulsuk; M. Hoy
Lowland Technology International Vol 20 No 2, Sep (2018)
Publisher : International Association of Lowland Technology

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Abstract

This paper presents the application of the Analytic Hierarchy Process (AHP) in rural roads prioritiation. The paper exhibits the concept and process of the plan for rural road development and application of multiple criteria decision analysis using AHP for prioritiing rural roads on a rational basis. Rural road network was grouped on strategic issues and strategies of Department of Rural Roads. There are three main factors to be used as an indicator to assess the importance of routes of each type of road: Transport and Traffic engineering, Accessibility and Other. The result of criteria weights was determined by Expert Choice software according to the AHP model. The results of weight factor analysis can be divided into 2 groups: the Transportation and Traffic Engineering dominant road (Logistics, Traffic Reduction and Countrys order Road) and the Accessibility dominant road (Tourism and Rural Area Accessibility Road). This study will be able to prioritie rural roads and allocate limited budget for development in the future. The master plan obtained from AHP application shows that this plan is consistent, and links with the country strategic plan under the Department of Rural Roads year 2017-2026, which is a longterm plan (10 years), and the Strategic Plan Framework Development of Rural Roads year 2017 - 2020, which is a medium-term plan (4 years). The main goal of the Rural Roads Development Plan in the area is to develop a rural road network to connect the Development of National Infrastructure and the Northeast Development Plan perfectly.
Raw water reserve and conveyance capacity of West Water Canal of Metropolitan Waterworks Authority J. Nirunrat; W. Thaisiam; A. Pornprommin
Lowland Technology International Vol 20 No 2, Sep (2018)
Publisher : International Association of Lowland Technology

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Abstract

Metropolitan Waterworks Authority (MWA) is responsible for supplying potable water to Bangkok, Nonthaburi and Samut Prakan provinces. There are two raw water sources used, Chao Phraya River and Mae Klong River, conveyed via canal systems. At present, West Water Canal (WWC) system with the total length of 107 km carrying the discharge of about 20 m3/s from Mae Klong River. It was designed to be capable to convey 45 m3/s with using Bang Len Pumping Station (71 km from the upstream end). However, MWA modified the WWC system by constructing a bypass canal at the pumping station. Thus, water flows completely by the gravitation which saves both cost and energy. Nevertheless, it is expected that the present canal system cannot deliver water at its design conveyance capacity, and problems may arise in the future if water demand increases. In this study, we have performed a fully hydrodynamic onedimensional model. It is found that the present maximum capacity is approximately 24 m3/s. To meet the design capacity of 45 m3/s without using the pumping station, it is necessary to implement 15-km canal modification and build an additional bypass canal. The redesign of the canal will help MWA to save the energy at least 4,750 Mwh/year. In addition, it should be known that how long and how much we can use water reserve in the canal for production if the inlet at Mae Klong River is temporally closed due to emergency or canal maintenance. From the model result, WWC system can reserve water for 15 and 12 hours for the cases of the existing system under 24 m3/s and the modified system under 45 m3/s, respectively.
Assessing the climate change impact on floodplain inundation map in the Chiang Mai municipality, upper Ping river basin of Thailand K. Boonrawd; C. Jothityangkoon
Lowland Technology International Vol 20 No 2, Sep (2018)
Publisher : International Association of Lowland Technology

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Abstract

Coupling of water balance model and floodplain inundation model is developed to receive projected rainfall time series from two types of regional climate model (RCM). Providing Regional Climates for Impacts Studies (PRECIS) and Meteorological Research Institute (MRI) are RCM with resolution 0.2 x 0.2 degree (grid sie 20 x 20 km) daily time step, from year 20152044. They are generated from ECHAM 4 climate models. Empirical quantile mapping is used for bias correction of projection rainfall that its adjustment factors are estimated from comparison between observed and past projection rainfall from base-time period, year 1985-2014. A floodplain inundation model is applied based on 1D rating curve approach. This model receives peak runoffs as results from the water balance model, and generate flood extent in flood plain and draw flood inundation map of Chiang Mai municipality with different return periods. These expected results show the increase of flood inundation extent as a consequence of climate change
Assessment of water balance using SWAT – A case study of the Nakhon Ratchasima Province P. Kosa; T. Sukwimolseree
Lowland Technology International Vol 20 No 2, Sep (2018)
Publisher : International Association of Lowland Technology

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Abstract

In the dry season, the Nakhon Ratchasima province is facing a water scarcity problem in every year due to the gap between demand and supply of the water system. However, there are the high rainfall and runoff during rainy season. Then, the purposes of this study are to analyze the water balance and to manage the water resources in Nakhon Ratchasima province using SWAT. The study can be presented that, during dry season, the total amount of water demand is higher than the amount of runoff for the Lam Takhlong basin, Lam Phra Phloeng basin, Lam Sae basin, Lam Plai Mat basin, and Lam Chakkarat basin. However, this water demand can be supported by the maximum water storage in the reservoir. On the other hand, the total amount of water demand is less than the amount of runoff for Lam Choengkrai basin, Upper part of Lam Nam Mun basin, Lam Sa Thaet basin, and Second part of Lam Nam Mun basin. The excess water runoff from Lam Choengkrai basin should be diverted to Lam Takhlong basin and water diversion from Upper part of Lam Nam Mun basin should be considered for Lam Phra Phloeng basin and Lam Sae basin.
Submerged breakwaters design development based on artificial oyster reef C. Ketsiri; D. Kositgittiwong; C. Ekkawatpanit
Lowland Technology International Vol 20 No 2, Sep (2018)
Publisher : International Association of Lowland Technology

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Abstract

Due to the problem on coastal erosion is getting more severe currently, there should be the study on the potential impacts of coastal protection structures on the erosion and sediment movement on areas under influence of currents, tides and storm surges. The various kinds of coastal structures can be applied to solve, or at least, to reduce these problems. The present study focuses on detached breakwaters and artificial reefs which are classified as Low crested and submerged structures (LCS). It is used also to provide reducing for the hydraulic loading to become required level where the dynamic equilibrium can be maintained at the shoreline. To accomplish the mentioned goal, the design of LCS structures is needed to allow the transmission of a definite amount of wave energy over the structure by overtopping and also letting transmission occurred through the porous structure. Not only the term of mechanism but also the nature dynamics of the ecosystem are considered to create flexible and sustainable infrastructure while enhancing nature values. The coastal protection measures by using nature and natural processes are expected to have positive impact not only in nature and safety but also in other functions such as recreation or economy. In the present study, artificial oyster reef in Oesterdam, The Netherlands, is studied based on the geometric form, movement of particle shells inside, composition of structure of oyster reef related with the ability to reduce the wave energy.
Uplift of very sensitive soft clay due to pile driving W. Teparaksa; J. Teparaksa
Lowland Technology International Vol 20 No 2, Sep (2018)
Publisher : International Association of Lowland Technology

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Abstract

The subsoil of Samutprakarn province in Thailand consists of thick sensitive very soft clay layer. The construction, such as pile driving and excavation work would lead to reduce the shear strength of very soft clay or induce the excess pore pressure on very soft clay. This paper presents the results of pile driving around the press pit reinforced concrete structure which was excavated and constructed on the very soft sensitive clay. The pile driving effect surrounding the press pit caused the uplift of press pit. The uplift of press pit was investigated by additional soil investigation, piezometer installation as well as coring the base slab of press pit. The investigation result was analyzed for clarifying the uplift behaviors before remedial work. At present, the remedial work was already completed.

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