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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 8 Documents
 1 
Search results for , issue "Vol 7 No 2, Dec (2005)" : 8 Documents clear
SOCIO-PHYSICAL ENVIRONMENTS AND ALGAE/ WATER QUALITY PROPERTIES OF IRRIGATION PONDS: CASE STUDY IN MINAKUCHI AND OTSU, JAPAN K. Hiramatsu; C. Yanagihara; E. Ichion
Lowland Technology International Vol 7 No 2, Dec (2005)
Publisher : International Association of Lowland Technology

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Abstract

Irrigation pond called ‘Tameike’ is a type of Japanese traditional rainwater harvesting facilities built to store rain and supply water to farms. It is, however, difficult to sustain a sound management of these systems due to the social changes in Japan, i.e. aging of the rural community and regression of the domestic agricultural industry. Therefore, knowledge, means and ideas are required to maintain irrigation ponds in desirable conditions. In this paper, the water quality, algae and socio-physical environments of 35 ponds in Otsu city and Minakuchi town were investigated and their relations were discussed using the statistical methods; factor analysis and cluster analysis, aiming the acquisition of knowledge for the management. Our investigations revealed that three common factors; ‘scale of the pond’, ‘development of the catchment’, and ‘cultivation in the catchment’ that explain the socio-physical environments. Based on these factors, the ponds were categorized into four types and each compared from the view of trophic levels, diversities and dominant species of algae and location of the pond. It has become apparent that the obtained factors and clusters could explain the tendencies of water quality and diversity, while the relations to dominant species of algae are still ambiguous.
MECHANISM CONTROLLING UNDRAINED SHEAR CHARACTERISTICS OF INDUCED CEMENTED CLAYS S. Horpibulsuk
Lowland Technology International Vol 7 No 2, Dec (2005)
Publisher : International Association of Lowland Technology

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Abstract

Understanding of undrained shear behavior of induced cemented clay is of utmost importance for strength and deformation analyses of in-situ deep mixed columns under short-term condition. From the critical analysis of two different clays (Bangkok and Ariake clays) admixed with cement, the difference in undrained shear responses of the induced cemented and uncemented clays are brought out. Since the induced cemented clays are in meta-stable state, the strength and deformation characteristics are controlled by the clay fabric and cementation. At pre-yield state, thecementation is the main contributing factor of the strength while the effect of fabric comes into play when the state ofstress is at post-yield state. The strain softening behavior is realized even at post-yield state, attribute to the break up of the cementation bond. The failure envelope of the induced cemented clay is a single straight line for both pre- and postyield states, which is different from that of uncemented clay. The role of the cement is mainly to increase the cohesion intercept with insignificant change in internal friction angle.
CONSOLIDATION OF CLAYEY SUB-SOILS WITH INTERMEDIATE PERMEABLE LAYERS IMPROVED BY VERTICAL DRAINS WITH SMEAR EFFECT G. Imai; U. P. Nawagamuwa
Lowland Technology International Vol 7 No 2, Dec (2005)
Publisher : International Association of Lowland Technology

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Abstract

Design of vertical drains is usually based on Barron's theory considering the clay layer is always homogeneous. However it has often been recognized in several situations that many natural deposits have considerable in-homogeneities, such as laminations of coarser material within the clay layer. Field data from such clay layers improved by vertical drains have sometimes shown that the commonly used conventional equations should be modified. In this paper, considering horizontal and vertical inflow and outflow into and out from a small element, governing equation of consolidation has been formulated with the effects of varying permeability and compressibility with time. Two kinds of new parameters are defined as K=(ks/kc)(Hs/Hc) and α98=t98(2D)/t98(radial) considering different coefficients of permeability and sand/clay thickness. With these definitions, the importance of thin intermediate permeable layers, which were previously overlooked in designs, are discussed in this paper. The variation of ch/cv back calculated from the insitu tests are assessed with the above theoretical concepts considering both effects of smear and intermediate permeable layers. Practical approaches for measuring insitu permeability and thickness of intermediate permeable layers for better prediction are also included.
PERFORMANCE OF DEEP EXCAVATED RETAINING WALL IN SHANGHAI SOFT DEPOSIT Z. H. Xu; W. D. Wang; J. H. Wang; S. L. Shen
Lowland Technology International Vol 7 No 2, Dec (2005)
Publisher : International Association of Lowland Technology

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Abstract

This paper presents a field case of deep excavated pit of a building foundation in soft deposit of Shanghai lowland area. The details of the project are described at first. Then, the design method and construction process are presented. The wall displacements, axial force of struts, and displacement of the steel lattice columns were monitoredand the results are presented and compared with the calculated results in design. Field measured data show that the ratio between the maximum lateral displacement and the excavated depth was controlled within 0.62%. Monitored data also show that the axial force in the second level struts was the largest among the three levels struts while the axial force in the first level strut was the smallest. The design method described in this paper is used to predict the diaphragm wall deformations. The prediction is consistent well with the measured data. However, there are some discrepancies of the axial forces in the struts between the calculated values and the measured values. Factors affecting effectiveness of the supporting system were investigated. The larger the thickness of the wall and the larger the stiffness of the struts, the smaller displacement of the wall will result. The rate of reduction of the wall displacement decreases with the increaseof the thickness of the wall and the stiffness of the struts. There exists a threshold value of the depth ratio of the diaphragm wall, which has a significant influence on the lateral displacement. In this field case the threshold value of depth ratio is 0.3.
INTERACTION BETWEEN RECREATION ACTIVITY AND PUBLIC PREFERENCE: A CASE STUDY ON PUBLIC PARKS IN SAGA CITY, JAPAN P. Iamtrakul; K. Teknomo; K. Hokao
Lowland Technology International Vol 7 No 2, Dec (2005)
Publisher : International Association of Lowland Technology

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Abstract

Public parks are one of the representatives of urban environment that play an essential role to daily life of people and provide a variety of benefits and opportunities for community as green spaces. The lack of understanding of associations between pattern of park utilization and users’ preference has made difficulties to highlight the role of public parks in community while reflecting social needs of park users. To reflect actual preference of park users, Saga city in Japan was selected as a case study by employ an unconventional method to capture the real preference from actual target group of public park service. An indirect value of park users’ benefits estimation has been done through the determination of preference value factor, PVF in different users’ socioeconomic and recreation activity characteristics. The uniqueness of this method is to focus on the linkages between the availability of public parks and social preferences. On the basis of findings, the results pointed out that not only different satisfaction on park service induce on the differentiation of PVF value but the different willingness to pay on maintenance and management park service also result to demonstrates an different intuitive appreciation for environmental valuation based on park visitors’ preference.
RESEARCH ON THE FORMATION OF URBAN RESIDENTIAL LIFESTYLES THROUGH CASE STUDIES OF LOWLAND CITY SAGA AND NON－LOWLAND CITY KITAKYUSYU J. Ge; K. Hokao
Lowland Technology International Vol 7 No 2, Dec (2005)
Publisher : International Association of Lowland Technology

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Abstract

In this paper, we firstly put forward the conception of residential lifestyles; and suitably questionnaire surveys were conducted in two cities of Japan- lowland city Saga and non-lowland city Kitakyusyu. Through the analysis of the questionnaire data, we got hold of the characteristics of residential preference patterns, residential emphasis on dwelling selection, as well as the evaluation on residential environment satisfaction. Furthermore, the comparison between the two cities helped to make clear the similarity and difference of the residential emphasis between lowland city and non-lowland city. The results of the research will not only be benefit to the understanding of the diversification of residential lifestyles, but also provide more information to the planning and developing of residential environment effectively and efficiently by understanding the residential preference, emphasis and demands of various patterns.
SORPTION CHARACTERISTICS OF THE SOFT BANGKOK CLAY L. Sthapit; C. S. P. Ojha; U. Glawe
Lowland Technology International Vol 7 No 2, Dec (2005)
Publisher : International Association of Lowland Technology

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Abstract

Asian countries are in a need for identification of suitable sites for disposal of municipal solid wastes. The travel of pollutants is significantly influenced by the properties of the porous medium through which these travel. In Thailand, existing land disposal sites, which were initially selected in view of the low lying areas or the water bodies, are likely to last not for many years. In the light of this, it is essential that soils available in the region are tested and evaluated for their specific characteristics relevant to the safe disposal of solid wastes and planning of future landfill sites. Sorption characteristics are of special significance in the design of landfills. In this paper, the Bangkok clay has been evaluated for its sorption characteristics. Various adsorption isotherm models are tested and it has been observed that the Langmuir model performs best. The study indicates that the process of sorption is non-linear in nature and is sensitive to the type of influent characteristics.
ECOLOGICAL COMPENSATION IN URBAN DESIGN OF COASTAL LOWLAND CITY: LINCHENG NEW TOWN K. Wang; Z. Cao; L. Xu
Lowland Technology International Vol 7 No 2, Dec (2005)
Publisher : International Association of Lowland Technology

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Abstract

The ecological problem of living environment should be explored to the city extension. Urban design is working at control on the physical form and environments of a town and managing its multi systems. Accordingly, it is with great necessity to emphasize the operation of ecological compensation through out the whole process of urban design. It is especially demanded in the coastal lowland cities in China, which are developing most quickly and breaking the balance of nature most seriously. This paper tries to study four dominating factors (landscape, water system, green space, buildings) of ecological control and compensation in urban design through a serious of urban design projects in Lincheng New Town with consideration of the ecological character of coastal cities.

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