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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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STRESS-STRAIN-STRENGTH CHARACTERISTICS OF SOFT HONG KONG MARINE DEPOSITS WITHOUT OR WITH CEMENT TREATMENT Jian-Hua Yin
Lowland Technology International Vol 3 No 1, June (2001)
Publisher : International Association of Lowland Technology

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Abstract

This paper presents the results of triaxial tests on soft Hong Kong marine deposits (HKMD) without or with cement treatment. Special attentions are paid to the features of stress-strain relationships and the effective stress paths. Useful correlation (a) between index properties and strength parameters and (b) cement ratio and strength parameters and Young's modulus are presented. The data presented are of practical significance for design and construction of civil works on HKMD in Hong Kong.
SETTLEMENT OF STRIP FOOTINGS ON RECENTLY DEPOSITED TROPICAL COASTAL LOWLANDS H. B. Poorooshasb
Lowland Technology International Vol 3 No 1, June (2001)
Publisher : International Association of Lowland Technology

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Abstract

Many coastal lowlands are recently deposited. That is the soil layer consists of a thick layer of normally consolidated clay, silty clay, clayey silt or a combination thereof. In certain areas the deposit is so soft at the grade level that it cannor support the slightest of loads. In other areas, perhaps a few kilometers away from the shore-line, the surficial soils have become over-consolidated by desiccation and can support some load. These localities are, more often than not, of very gentle slope and carry scant vegetation. The layer supportng the crust (the desiccated soil) is still normally consolidated, highly compressible and its water content often exceeds the LL. Construction on such a formation obviously presents a serious problem and certain guidelines may be of value. It is the aim of the present paper to provide some such information. The discussions are limited to the performance of strip footing for low cost single story housing units.
LAND SUBSIDENCE DUE TO SEASONAL PUMPING OF GROUNDWATER IN SAGA PLAIN, JAPAN Akira Sakai
Lowland Technology International Vol 3 No 1, June (2001)
Publisher : International Association of Lowland Technology

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Abstract

In lowlands comprised of soft ground, land subsidence due to excessive groundwater pumping causes many problems, including damage to roads and structures, and an increased risk of flood due to the reduced drainage capacity of the system. Subsidence in Saga Plain, Japan, has been caused by fluctuating groundwater levels due to summer pumping for agriculture and winter recharge. The nature of land subsidence due to these groundwater level fluctuations is the focus of this paper. The characteristics of land subsidence and groundwater level were identified in both the Holocene clays and Pleistocene aquifer that form the hydrological system of the Saga Plain.
HYDROLOGICAL AND ENVIRONMENTAL CHARACTERISTICS OF WETLANDS IN EGYPT Hossam M. Nagy
Lowland Technology International Vol 3 No 1, June (2001)
Publisher : International Association of Lowland Technology

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Abstract

Egyptian wetlands are classified into two broad categories: coastal adn inland wetlands. The major problem of coastal wetlands, which are located in the northerm part of the Nile Delta, is the environmental impacts caused by the intrusion of saline water into fresh water aquifer. Inland wetlands, which are often located in the depressions of western desert or other areas along the Nile Valley, can be further classified as either natural wetland such as Wadi Elnatrun depression, or manmade wetland such as Siwa oasis. The associated problems in manmade wetlands comprise the groundwater abstraction which often exceeds the actual need, the negative impact of upland drainage on neighboring lowland, and the rise of groundwater table in agricultural lands due to illegal alteration of irrigation systems by farmers. Another type of manmade wetlands is the riverine land, which was existed in south of Egypt after the construction of Aswan High Dam and caused dramatic migration for some living societies and relocation of some historical monument. This review addresses the current problems faced by those coastal and inland wetlands, and illutrates the mitigation systems proposed in Egypt for tackling such problems.
THE ANTHROPOLOGICAL AND ECOLOGICAL IMPORTANCE OF TIDAL FLATS TO JAPAN AND KOREA WITH SPECIAL REFERENCE TO OYSTER-GATHERING ACTIVITIES Jun Takeda; Eung-Cheol Lee; Kyoung-Mann Cho
Lowland Technology International Vol 3 No 1, June (2001)
Publisher : International Association of Lowland Technology

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Abstract

Tidal flats of the estuarine ecosystem, reef flats of the coral ecosystems and mangrove ecosystems have up until now ensured the food availability of biologically diverse marine resources on a year-round basis. Traditionally, fishing-gleaning activities have been carried out on a daily basis by women, children and the agedm using non-specialized tecniques or technologies on reef flats in the Ariake Sea, Japan and along the west coast of South Korea. These flats and mangrove ecosystems are covered by the sea twice a day when the tide is at flood, and they are uncovered at ebb. Therefore, it has given people the opportunity to enjoy a supply of oysters and other marine resoources two times a day since ancient times. Oyster-gathering activities through traditional fishing-gleaning strategies on tidal flats in Japan and Korea are, in this study, focused on and discussed in terms of ecological anthropology.
ESTIMATED CONSUMPTIVE USE AND FIELD IRRIGATION REQUIREMENT FOR RICE DURING THE DRY PERIOD: A CASE STUDY IN THE GANGES LOWLAND REGION OF SOUTHWEST BANGLADESH Muhammad Qumrul Hassan
Lowland Technology International Vol 3 No 1, June (2001)
Publisher : International Association of Lowland Technology

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Abstract

This paper deals with the Consumptive Use (U) and the Field Irrigation Requirement (FIR) for rice crop during the dry period of the Jessore district in the Ganges lowland of southwest Bnagladesh by using the Blaney-Criddle Method. The estimated U ranges from 3.11 mm/d in December to 7.65 mm/d in April. The minimum and maximum estimated FIR for rice crop in the months of December and April is about 3.54 mm/d and 6.61 mm/d, respectively. The total seasonal FIR is about 807 mm for rice crop during the present dry period. The above results may prove useful for the future planning of a rice crop-design calendar of the Jessore district during the dry period
EXAMINATION OF PUSAN CLAYS AT A REFERENCE TESTING SITE S. G. Chung; p H. Giao
Lowland Technology International Vol 3 No 2, Dec (2001)
Publisher : International Association of Lowland Technology

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Abstract

In early 2000, five special testing sites were proposed by Dong-A University's Brain Korea 21 Project, to look into some unusual geotechnical characteristic of Pusan clays. In this paper, the concept of a reference testing site and the way in which it has been set up and investigated are presented. Some of the results of both laboratory and in situ testing at a reference site are reported for illustration. The newly obtained data were analyzed and presented using both conventional and novel approaches in soft clay engineering. The initial results have demonstrated the benefits of having a reference testing site for moving toward a better characterization of Pusan clays. Such a practice can be considered as a useful step in geotechnical investigation of low land areas in the Nakdong river plain.
ANALYTICAL MODEL OF HEXAGONAL WIRE MESH REINFORCEMENT WITH WEATHERED BANGKOK CLAY BACKFILL D. T. Bergado; P. Voottipruex; A. Asanprakit; C. Teerawattanasuk
Lowland Technology International Vol 3 No 2, Dec (2001)
Publisher : International Association of Lowland Technology

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Abstract

An analytical method is proposed for determining the pullout resistance/pullout displacement relationship for both of PVC-coated and zinc-coated hexagonal wire mesh reinforcement. The parameters used in this analytical model were obtained from pullout testing programs, such as shear stiffness (ks) and initial slope of pullout bearing resistance (Eip). In addition, this method can predict the movement characteristics of both PVC-coated and zinc-coated hexagonal mesh during pullout. The displacements along the reinforcement axial stiffness and the friction resistance can be simulated by linear, elastic-perfectly plastic model. The hyperbolic model can be used to calculate the bearing resistance. Reasonable agreement between the predicted and measured pullout resistances were obtained. From the predicted values, the percentages of the friction resistances to the total pullout resistances are 18% and 16% for zinc-coated and PVC-coated wire mesh, respectively. Consequently, the bearing resistances are 82% and 84% of the total pullout resistances for zinc-coated and PVC-coated hexagonal wires,respectively. The ratios of friction resistances are 22% and 19% for the zinc-coated and the PVC-coated wire meshes, respectively. The total pullout resistances in the zinc-coated mesh is higher than PVC-coated mesh by approximately 20%. Furthermore, the weathered clay backfill was found to have higher pullout resitance and lower pullout displacement than the silty sand backfill.
ELECTRICAL CONDUCTIVITY AND DIELECTRIC CONSTANT OF BENTONITE MEASURED WITH TIME-DOMAIN REFLECTOMETRY Md. A. Mojid; Nobou Toride
Lowland Technology International Vol 3 No 2, Dec (2001)
Publisher : International Association of Lowland Technology

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Abstract

The dielectric constant, ɛ, and bulk electrical conductivity (EC), σ, of Na- and Ca- bentonite samples were measured with time-domain reflectometry (TDR). Water retention characteristics were also determined. Na- bentonite retained much more water than Ca- bentonite at all suctions. Both bentonite pastes remained saturated for a volumetric water content Ɵ ≥ 0.60 m3 m-3 (water content by weight w ≥ 0.50 kg kg-1). The bentonite samples, athough prepared by using distilled water, had a fairly high σ with a peak at Ɵ = 0.60 m3 m-3. For saturated conditions, the EC increased with decreasing Ɵ and, hence, increasing dry bulk density, ρb. The greatest σ was found at the lowest Ɵ for which the sample was still saturated with water: σ = 3.88 dS m-1 for Na- bentonite and 1.45 dS m-1 for Ca- bentonite. The EC decreased with decreasing Ɵ for unsaturated conditions. Due to energy losses, the TDR waveform was almost completely attenuated for 0.45 ≤ Ɵ ≤ 0.87 m3 m-3 (0.31 ≤ w ≤ 2.50 kg kg-1) for Na- bentonite and for 0.36 ≤ Ɵ ≤ 0.50 m3 m-3 (0.22 ≤ w ≤ 0.38 kg kg-1) for Ca- bentonite. As the water content decreased, the quasi-crystals (tactoids), consisting of several clay particles with near-parallel alignment, came closer together and diffuse double layers started to overlap. This resulted in good conductive pathways with the greatest σ for the lowest saturated water content of Ɵ = 0.60 m3 m-3 . Additional decreased because air entered the system. The EC was higher in Na- bentonite than in Ca- bentonite for all water contents. Because of the more dispersed particles and larger number of quasi-crystal in the Na- system than in Ca- system, the electrical conductance between the quasi-crystal would be higher for the Na- bentonite than for the Ca- bentonite. Similarly, water molecules will be adsorbed more strongly and might cause higher water retention in Na- bentonite than in Ca- bentonite at the same suction.
APPLICATION OF GLOBAL OPTIMIZATION TECHNIQUE FOR CALIBRATING THE XINANJIANG WATERSHED MODEL H. A. P. Hapuarachchi; Zhi-jia Li; M. Ranjit; Q. J. Wang
Lowland Technology International Vol 3 No 2, Dec (2001)
Publisher : International Association of Lowland Technology

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Abstract

The manual calibration process of the Xinanjiang model is extremely difficult and it can be a rather frustating and time consuming exercise for an inexperienced person. Therefore, in recent years, researchers are exploring ways to incorporate 'expert knowledge' of conceptual watershed models into the automatic calibration procedures. Although there are many optimization techniques that can be applied for calibrating the Xinanjiang model, they are still not good enough to find a conceptually realistic and global optimum parameters set for the model. This paper presents a brief introduction to the Xinanjiang model and a research work on application of SCE-UA (Shuffle Complex Evaluation) global optimization technique for calibrating Xinanjiang watershed model using hydrological data of three catchments of different sizes and climatic conditions. Results show that the overall performance of SCE-UA method for calibrating the Xinanjiang model is very good. On the basis of the result derived from the calibration and verification stages, it demonstrates that SCE-UA is capable of finding a global optimum and conceptually realistic parameter set for the Xinanjiang model.

Page 10 of 47 | Total Record : 463

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