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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 6 Documents
 1 
Search results for , issue "Vol 8 No 1, June (2006)" : 6 Documents clear
STOCHASTIC CELLULAR MODEL FOR LOWLAND URBAN DEVELOPMENT K. Teknomo; G. P. Gerilla; K. Hokao
Lowland Technology International Vol 8 No 1, June (2006)
Publisher : International Association of Lowland Technology

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Abstract

An urban growth model using stochastic cellular simulation was developed with motivation to understand the consequence of zone management policies in lowland cities. The model could integrate the growth, decline, spread, intensification, and protected areas of the urban growth into a single generalization of both the Eden and the p-models. Calibration strategy was demonstrated using historical aerial photographs of Saga city, Japan.
OPTIMISATION OF WATER MANAGEMENT IN URBAN POLDERS CASE STUDIES OF THE NETHERLANDS AND THAILAND P. Wandee; B. Schultz; T. Tingsanchali
Lowland Technology International Vol 8 No 1, June (2006)
Publisher : International Association of Lowland Technology

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Abstract

Rainfall in the Netherlands has moderate intensities and is more or less evenly distributed over the year while in Thailand rainfall occurs at high intensities and predominantly in the rainy season. The aim of the water management system in an urban area in a polder is to provide good drainage and discharge out of the polder. This paper presents a mathematical model for the optimisation of the main components of the water management system in urban areas in polders in the Netherlands and in Thailand. The main components of the water management system in an urban area in a polder are cross-sections of the sewers, distances between the canals, percentages of open water, canal water levels below the surface and discharge capacity of the outfall structures or the pumping stations. In order to find optional values for these main components the software package OPOL has been further developed. This package takes into account the relevant hydrological processes, construction and operation and maintenance costs for the water management system and damages due to high groundwater tables, water on the street, or even inundation under influence of rainfall and water level fluctuations in the urban canals. Optimising such a system aims at determining the main components in such a way that the annual equivalent costs will be minimal. The results of a case study for an urban polder in the area of the Principal Water-board of Delfland, the Netherlands and of another one in Bangkok, Thailand are shown. It was found that the canal water level has the largest influence on damages in these urban polders.
ESTIMATING THE POTENTIAL FOR CONJUNCTIVE WATER MANAGEMENT IN COASTAL PLAINS N. Cao Don; H. Araki; N. T. Minh Hang; H. Yamanishi; K. Koga
Lowland Technology International Vol 8 No 1, June (2006)
Publisher : International Association of Lowland Technology

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Abstract

This paper presents the development and application of a conjunctive water management model for lowland catchments. The model incorporates a simulation model and a management model to simulate groundwater movement, ground consolidation and to search for the potential pumping amount of groundwater without violating physical and environmental constraints. The results reveal that groundwater levels in a coastal aquifer greatly vary in response to pumping. Consequently subsidence rapidly occurs throughout the area. The study also suggests that conjunctive water management can be used to improve water supply reliability, to reduce groundwater overdraft and land subsidence and to improve environmental conditions.
EFFECT OF THICKNESS OF OVERLAYING CLAY LAYER OF LOWLAND REGION ON SENSITIVITY OF LATERAL DEFLECTION OF LONG PILES EMBEDDED IN NONHOMOGENEOUS SOIL - PART I: THEORETICAL FORMULATION D. H. Hafez; B. B. Budkowska
Lowland Technology International Vol 8 No 1, June (2006)
Publisher : International Association of Lowland Technology

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Abstract

The importance of sensitivity analysis of soil-structure interaction system is embodied in two facts, that is, the soil is a nature-made material that affects the system’s performance and the sensitivity theory constitutes an inherent part of the behavior of the system. Moreover, the access to the supporting system is limited. Therefore, it is essential to have a reliable basis for the assessment of how changes of the parameters of the system affect its performance. The paper presents the study of sensitivity of laterally loaded piles using the distributed parameter sensitivity method. Other available sensitivity methods are briefly described in the paper. The theoretical formulation of the sensitivity of the lateral head deflection of piles embedded in non-homogeneous soil to changes in the design parameters is derived. The non-homogeneous soil consists of soft clay overlying sand and the design parameters are those that define the pile and the adjacent clay and sand. The formulation resulted in obtaining sensitivity operators that can show along the pile length where and how the change of each parameter affects the change of lateral pile-head deflection. The formulation provides the basis for studying the effect of the thickness of the overlying clay on the sensitivity results.
DEFORMATION BEHAVIOR OF SHIRASU SOIL BY THE EXTENDED SUBLOADING SURFACE MODEL M. Hira; K. Hashiguchi; M. Ueno; T. Okayasu
Lowland Technology International Vol 8 No 1, June (2006)
Publisher : International Association of Lowland Technology

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Abstract

This study is aimed at evaluation of the deformation behavior of Shirasu soil (volcanic sandy soil) for reclamation and embankment construction, using elastoplastic constitutive equation based on the subloading surface model with the rotational hardening. Test results for isotropic consolidation and monotonic/cyclic loading-unloading compression with several lateral stresses under the drained conditions for various initial void ratios are reported. Further, the simulation by the constitutive equation based on the extended subloading surface model is compared with the test results. High applicability of the constitutive equation for the prediction of mechanical behavior of Shirasu soil for a geo-material at the lowland in the southern Kyushu is verified by the comparison.
GEOSYNTHETIC REINFORCEMENT FOR EMBANKMENTS OVER DEGRADING DISCONTINUOUS PERMAFROST SUBJECTED TO PRESSTRESSING M. C. Alfaro; J. A. Blatz; J. Graham
Lowland Technology International Vol 8 No 1, June (2006)
Publisher : International Association of Lowland Technology

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Abstract

Failures of road embankments on discontinuous permafrost commonly occur during thawing of the foundation soil. As an approximation, weak zones created by thawing of discontinuous permafrost can be considered as ‘voids’ within the foundation. Geosynthetic reinforcements have been used to bridge these ‘voids’ and provide support to the embankment fill. This paper presents results of a numerical investigation on the effects of prestressing geosynthetics to enhance their reinforcement effect, and thus reduce deformations of embankments over discontinuous permafrost. The study used the commercially available computer program, FLAC. Numerical analysis illustrates that prestressing geosynthetic reinforcement can be effective in controlling deformations and reducing the possibility of collapse of road embankments on degrading discontinuous permafrost.

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