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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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ON THE NORMALIZED RELATIVE ROUGHNESS FOR SOIL-FIBER REINFORCED POLYMER INTERFACE SHEAR BEHAVIOUR Hussein Abed Shaia; Hossam Abuel Naga
Lowland Technology International Vol 16 No 1, June (2014)
Publisher : International Association of Lowland Technology

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Abstract

Several studies in the literature have investigated the shear behaviour of soil-steel interface. Furthermore, a normalized relative roughness parameter, Rn, has been used successfully to describe the shear behaviour of the sandsteel interface. On the other hand, few studies are available in the literature regarding the interface shear behaviour of fiber reinforced polymer (FRP). The aim of this study is to investigate the shear behaviour of soil-FRP interface and examine the validity of Rn for the FRP case. Experimental program using a modified direct shear test apparatus was conducted for this purpose. The testing materials in this study include two different types of FRP, and five different-size glass beads in terms of the mean particle size, D50. The experimental results show that the interface shear behaviour of FRP is different than steel. The observed difference could be explained in terms of the expected contribution of the interface ploughing resistance in the FRP case compared to the steel where its interface shear behaviour is mainly controlled by the interface sliding resistance.
MODELING THE INFLUENCE OF RIVER FLOW AND SALINITY INTRUSION IN THE MEKONG RIVER ESTUARY, VIETNAM Doan Quang Tri; Nguyen Cao Don; Pawan Kumar Mishra
Lowland Technology International Vol 16 No 1, June (2014)
Publisher : International Association of Lowland Technology

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Abstract

In this study, a hydrodynamic and solute transport model was applied to evaluate the effect of dredging on salinity intrusion in the estuary of the Mekong River, southern Vietnam. The model was calibrated and validated with available hydrographic measured data in 2000, 2004 and 2009. The flow and salinity at different positions in the river were dynamically assessed using the hydrodynamic and advection dispersion models. The factors of velocity, flow, water level providing flow boundary parameter for two-dimension model were calculated for both dry and flood season, while salinity was calculated only for the dry season to evaluate the impact of dredging to salinity intrusion process. The results of salinity intrusion simulation for 15 days show that the impact of dredging only occurs in the Quan Chanh Bo channel and does not affect the large river system. The minimum and maximum salinity concentrations along Quan Chanh Bo channel were predicted to be in the range of 2.0-6.0PSU.
DEVELOPMENT OF AN EVALUATION SYSTEM FOR PARKS IN NEIGHBORHOOD COMMUNITIES – CASE STUDY IN KITAKYUSHU CITY, JAPAN Liyang Fan; Yui Konishi; Hidetoshi Fukahori; Weijun Gao; Zhu Wang
Lowland Technology International Vol 16 No 1, June (2014)
Publisher : International Association of Lowland Technology

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Abstract

Parks are an important aspect of an ideal city. In the “neighborhood development” concept, the public park is the core of a neighborhood block, which is one of the basic components of the city. Using the neighborhood parks in Kitakyushu, Japan, as a case study, this research proposes an evaluation system for parks in urban area. First, the study uses GIS to identify each neighborhood park and define the neighborhood community. It then classifies neighborhood parks according to the land-use pattern of their communities. Next, the study develops an assessment index and used it for principal component analysis. Finally, based on the results of the analysis, the study comprehensively evaluates the community and park system in Kitakyushu city, Japan. The findings suggest that comparative evaluation between the different parks can help in understanding the characteristics and problems of existing information.
DYNAMIC EVOLVEMENT ASSESSMENT AND FORECAST OF LAND USE BASED ON GEOGRAPHIC INFORMATION SYSTEM Dongjie Guan; Xiaosong Lin; Weijun Gao; Weici Su; Kazunori Hokao
Lowland Technology International Vol 16 No 1, June (2014)
Publisher : International Association of Lowland Technology

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Abstract

Based on the land use patterns in the years of 1990, 1995, 2000 and 2005 acquired with the spatial technology of geographic information system (GIS), this study takes Kitakyushu city in Japan as a case to analyze and forecast the dynamic change and transformation of various land use types. Firstly, we use the spatial distribution maps to describe the changes of area and spatial distribution of land use in the past 15 years, and then the dynamic change models are established to evaluate the changes of speed and intensity of land use. The results indicate that each land use type has changed remarkably as the urbanization, and that the land use intensity has been transferring from extensive type to intensive type. Finally, we develop a transfer matrix of Markov to track the mutual transformation processes among the land use types, and to forecast the change tendency of future land use. The forecasting results reveal that the urban land will keep increasing at a decelerated speed, and it will be a long process for land use intensity to reach to the urbanization level.
QUANTITATIVE ASSESSMENT OF ECO-ENVIRONMENT VULNERABILITY IN KARST REGION Dongjie Guan; Weici Su
Lowland Technology International Vol 16 No 1, June (2014)
Publisher : International Association of Lowland Technology

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Abstract

The Karst area is typical eco-environmental vulnerable area, where insufficient farmland and serious soil degeneration offer vulnerable ability to endure the natural disasters. Consequently, vulnerable eco-environment can’t coordinate with rapid social economic development, which leads to its feeble sustainable developmental ability. The Karst area of Chongqing in China as a study case , this paper sets up 13 influencing factors of eco-environment vulnerability to be assessment indexes, including earth surface of carbonate rock salt, area of mountainous region, area of slopping upland farming, degree of rock desertification (classified by gently, moderately, seriously), forest coverage, loss area of water and soil, soil erosion modulus, slip volume density, cultivation index, farmland area per capita, agriculture population density. Subsequently, the paper uses analytic hierarchy process (AHP) to endow indexes weight, and proposes an assessment model by using fuzzy mathematics method to analyze and assess the eco-environment vulnerability of Karst area. Finally, the assessment results are rankly divided. Results indicate: there are 3 potentially vulnerable counties, 10 gently vulnerable counties, 6 moderately vulnerable counties and 6 seriously vulnerable counties among the 25 Karst counties in Chongqing.
ANALYSIS OF RESIDENTIAL ENVIRONMENT AND ENERGY USE IN RURAL AREAS IN HOT SUMMER AND COLD WINTER REGION OF CHINA-A CASE STUDY OF HANGZHOU Jiang Lu; Jian Ge; Xiao Yu Luo; Min Yan Lu
Lowland Technology International Vol 16 No 1, June (2014)
Publisher : International Association of Lowland Technology

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Abstract

With the gradual development of the new rural construction, and the continuous improvement of the rural per capita living space, sustainable development of the rural living environment is becoming an increasingly urgent task. This paper selected three different terrain villages in the rural area of Hangzhou as a study object, which located in the Middle and lower reaches of Yangtze River. Firstly, the investigation, collection and analysis on the building status, energy data and residents’ subjective feeling of the three villages had been done through basic research and sampling questionnaire. Secondly, it selected two typical housing in each village, separately carried on the measurement of the building physical environment and computer quantitative simulation of the ventilation, lighting, and energy consumption, along with the comprehensive evaluation with the simulation results. Finally, the major existing problems of the living environment in the rural areas have been found, according to which some operable implementation strategy and policy Suggestions have been put forward.
ROOT STRENGTH MEASUREMENTS OF VETIVER AND RUZI GRASSES Chairat Teerawattanasuk; Jindarat Maneecharoen; Dennes T. Bergado; Panich Voottipruex; Le Gia Lam
Lowland Technology International Vol 16 No 2, Dec (2014)
Publisher : International Association of Lowland Technology

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Abstract

This paper aims to study effect of roots of vegetation on the stability of soil along slopes and also soil erosion. The effects of root reinforcement depend on the morphological characteristics of the root system, the tensile strength of grass roots, and the spatial distribution of the roots in the soil. The experiments were carried out to evaluate the root tensile strength of two different grasses namely: Vetiver and Ruzi grasses, by conducting the laboratory tensile tests and field direct shear tests. For each type of grass, single root specimens were sampled and tested for their ultimate tensile strength and Young’s modulus in the laboratory tests. The results of laboratory tests revealed the significant correlations between root diameter and tensile force or tensile strength and Young’s modulus of Ruzi and Vetiver grasses. In addition, large scale field direct shear tests were carried out involving roots of Vetiver and Ruzi grasses to evaluate the contributions of their root systems to the soil shear strength. Vetiver roots contributed higher components of shear strength compared to Ruzi grass. However, it was found that the combination of Ruzi and Vetiver grass roots yielded much better effects than Vetiver grass alone. It can be concluded that the Vetiver grass roots help enhanced the shear strength for soil reinforcement while the short roots of Ruzi grass can help control surface soil erosion.
FIELD DISPOSITION OF THE MARGINAL STRIP OF THE RIVER DIKE UTILISING WOODEN RAFT AND PILE FOUNDATION ON SOFT CLAY Suman Manandhar; Daisuke Suetsugu; Hiroyuki Hara; Shigenori Hayashi
Lowland Technology International Vol 16 No 2, Dec (2014)
Publisher : International Association of Lowland Technology

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Abstract

Full scale field experimentations were incorporated along the downstream of the Chikugo River, Saga, Japan in order to observe the effect of wooden raft and pile foundation on the soft clay. In this study, the wooden raft and pile foundation was utilised for the marginal strip to understand the disposition of vertical settlements and lateral displacements of the ground. Cypress wood was taken into consideration in order for constructing raft and pile. Two different types of wooden raft and pile foundations with same dimensions were installed in the ground. The wooden raft installed with single-sided assemblages of wooden piles was configured as Case I. While, the same raft with both-sided assemblages of wooden piles was configured as Case II. A new embankment was constructed embedded with the existed ones on the river dike. The study was carried out for 136 days span of time from the beginning of the embankment construction. The results showed that both side assemblages of wooden piles were more effective to prevent the lateral displacement, reduce the vertical settlement and local deformation of the dike and the surrounding ground with compared to the single-sided installed piles of the similar foundation structure. The test results confirmed that the river dike supported by the wooden raft and pile foundation can be anticipated as more stable on sand layer of the soft ground within the depth of pile length.
DEVELOPMENT OF GROUND ENVIRONMENT IMPROVEMENT AND RESTORATION USING THE ROTARY CRUSHING AND DIFFUSIVE MIXING METHOD AS WELL AS ION ADSORPTION METHOD Mutsuhiro Ohno; Noriaki Nakajima; Hideo Suhara; Yuichiro Mishima; Hiroyuki Araki
Lowland Technology International Vol 16 No 2, Dec (2014)
Publisher : International Association of Lowland Technology

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Abstract

Lowlands are easily concentrated by effects of water and soil pollution. There is a demand for the development of technology that can both restore the ground environment and improve soft ground. The authors implemented testing used a rotary crushing and diffusive mixing (referred to hereafter as RCDM) method and an ion adsorption method (Nano-size inorganic Layered Double Hydroxide - NLDH - method) for the purpose of developing technology that can restore the ground environment and improve soft ground. These examples are believed to show the broad applicability of both methods.
INTEGRATED ASSESSMENT OF CHP SYSTEM UNDER DIFFERENT MANAGEMENT OPTIONS FOR COOPERATIVE HOUSING BLOCK IN LOW-CARBON DEMONSTRATION COMMUNITY Liyang Fan; Weijun Gao; Zhu Wang
Lowland Technology International Vol 16 No 2, Dec (2014)
Publisher : International Association of Lowland Technology

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Abstract

As residential energy consumption increases recently, there is greater focus of the energy conservation activities in residential sector. The combined cooling, heating and power (CHP) system, a well-known distributed energy system technology, has been paid more and more attention. In this paper, the performances of typical CHP systems are investigated for a cooperative housing block (CHB), a mixed residential development pattern recently popularized in Japan. Based on the building’s energy consumption, CHP technologies have been assumed and assessed following two design and management modes, namely heat tracking mode and electricity tracking mode. In order to obtain a comprehensive understanding of the performance of the assumed CHP systems in CHB, the system is assessed under different area functional proportion (AFP) and area social age structure (ASAS, the proportion of housing styles for different age groups). It can be proved that the cooperative use of CHP system in CHB is better than individual use in the conventional housing development. In addition, the CHP system can perform better if the urban planner properly design the function formation and consider the lifestyle of residents in different ages.

Page 5 of 47 | Total Record : 463

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