result 1314 件
| JaLCDOI | 10.18926/fest/11599 |
|---|---|
| FullText URL | 002_051_058.pdf |
| Author | Kishida, Takumi| Watanabe, Keiichiro| Ohtaki, Eiji| |
| Abstract | The Measuring instrument of carbon dioxide concentration in seawater (pCO(2)) is developed. The instrument consists of an equilibrator, a non-dispersive infrared gas analyzer (NDIR), a carrier gas generator and a processing signal generator. The equilibrator has a cross section of 3 c㎡ and is 15 cm tall. The principle of pCO(2) measurement is based on the equilibration of a carrier gas phase with a seawater sample and subsequent determination of the carbon dioxide concentration in the carrier gas. The carrier gas circuit of the NDIR is opened to the atmosphere to maintain the carrier gas line at a barometric pressure. The present instrument can measure pCO(2) within the measuring error of about 2 ppm with sample water of about 180ml every 20 min. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1997-01-10 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 51 |
| End Page | 58 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313348 |
| JaLCDOI | 10.18926/fest/11577 |
|---|---|
| FullText URL | 005_107_112.pdf |
| Author | Tohari Adrin| Nishigaki, Makoto| Komatsu, Mitsuru| |
| Abstract | Failures of railway embankments in Japan usually occur during rainfall period due to the rise of water level in the embankments. Laboratory experiments were carried out to elucidate the initiation of failure of embankment under the rise of water level. The changes in pore-water pressure were monitored during the rise of water table and at the initiation of failures. The experiment results showed that main failure of embankment was initiated by development of localized unstable area at the toe of the embankment models during the rise of water level. This indicates that failure of embankments was a consequence of instability of the toe of the slope induced by saturation process under drained condition. |
| Keywords | embankment failure process seepage face toe failure overall instability |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2000-02-29 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 107 |
| End Page | 112 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313411 |
| JaLCDOI | 10.18926/fest/11572 |
|---|---|
| Title Alternative | Comparison of micrometeorological environments inside and outside a watermelon plastic greenhouse |
| FullText URL | 003_121_126.pdf |
| Author | Morita, Noboru| Miura, Takeshi| |
| Abstract | The use of glass and plastic greenhouses have rapidly increased in recent years. Meteorological and soil moisture environments inside a greenhouse are significantly different from those in the open field. These differences should be understandable to establish accurate predictions of water consumption and evapotranspiraton inside a greenhouse which play impotrant roles in the design of any irrigation system. This study aims to estimate the micrometeorological conditions inside a watermelon plastic greenhouse which can be used for evapotranspiration calculations. Therefore, micrometeorological data were measured inside and outside the greenhouse for the comparison purposes. The results of this study may be summarized as : (1) Solar radiation inside the greenhouse was about 70% of that of outside it. (2) Net radiation during the daytime inside the greenhouse was almost the same as the absorbed total short-wave radiation. (3) The difference of air temperature inside and outside the greenhouse was very large during the daytime whereas not much difference was observed during the nighttime. (4) Both relative humidity and saturation deficit inside the greenhouse were higher than outside in case of highly vegetative land. (5) Wind speed inside the greenhouse was almost zero, while outside the average value was 1.8m/s. |
| Keywords | plastic greenhouse micrometeorology watermelon |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 121 |
| End Page | 126 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313884 |
| JaLCDOI | 10.18926/fest/11571 |
|---|---|
| FullText URL | 005_081_098.pdf |
| Author | Magda Waldemar| Maeno, Shiro| Nago, Hiroshi| |
| Abstract | A dynamic response of a submarine pipeline buried in sandy seabed sediments to water loading generated by harmonically oscillating water-table vertical movements is examined in the present report experimentally and numerically. The aim of small-scale laboratory experiments was: (1) to record time-histories of pipeline vertical displacements, and (2) to observe a shape of slip surface of an overburden sand body involved in breakout together with the pipeline. A parametric study was carried out in order to investigate the influence of two meaningful factors, that is the depth of burial and the specific gravity of pipeline, on a gradual upward displacement of the pipeline. Based on a numerical finite-element 2D-analysis of the hydrodynamic pore pressure and effective stresses oscillations in the pipeline vicinity, an analysis of the pipeline stability potential is presented, in which all the experimental cases tested are verified. All important component forces (e.g., hydrodynamic uplift force) associated with floatation phenomenon of the buried submarine pipeline are considered and quantified. |
| Keywords | submarine pipeline surface waves pore pressure floatation stability |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2000-02-29 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 81 |
| End Page | 98 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313700 |
| JaLCDOI | 10.18926/fest/11570 |
|---|---|
| FullText URL | 003_105_120.pdf |
| Author | Kidtimonton Surasri| Mitsuno, Toru| |
| Abstract | Two optimization models are formulated based on different objectives for assisting the irrigation planner in making decision on agricultural planning during drought year. The sensitive degree of water shortage area in the irrigation project are classified by those models. They are solved by simplex method. Firstly, the Two-phase method is applied to analyze the artificial variables in the formulated model. Then, the formulated model is modified after getting rid of the artificial variables to obtain the feasible solution. The agricultural planning is planned by considering the classified area with social equity and economic improvement. Crop diversification is introduced to conduct in the very sensitive water shortage area and intermittent irrigation system is introduced to operate in the moderately sensitive water shortage area. The integrated farming system, the separation of land owner and cultivator and the disposition of substitute lots system are also suggested to conduct in this study project. |
| Keywords | agricultural planning Two-phase method integrated farming sensitive water shortage disposition of substitute lots system |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 105 |
| End Page | 120 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313819 |
| JaLCDOI | 10.18926/fest/11567 |
|---|---|
| FullText URL | 003_075_095.pdf |
| Author | Magda Waldemar| Maeno, Shiro| Nago, Hiroshi| |
| Abstract | The response on sandy seabed sediments to a harmonically oscillating water-table, with a special consideration of the wave-induced pore-pressure oscillations around a pipeline buried in seabed sediments, is studied in the present work experimentally and numerically. The aim of the analysis was: (1) to observe a true distribution pattern of the wave-induced pore-pressure oscillations acting on the pipeline outer surface, and (2) to verify small-scale test results using numerical computations performed for a wide range of saturation conditions of seabed sediments, under the assumption of a compressible two-phase medium compound of the pore-fluid and soil skeleton, as well as a finite thickness of a permeable seabed layer. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 75 |
| End Page | 95 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313821 |
| JaLCDOI | 10.18926/fest/11559 |
|---|---|
| FullText URL | 005_031_034.pdf |
| Author | Watanabe, Masaji| |
| Abstract | We study unsteady flow that models lake flow in Kojima Lake. We assume that a lake is connected to another area with gates, and that those gates are opened when the water level outside the gates is lower than the water level of the lake. We study unsteady flow due to the opening of the gates. We analyze the problem with the finite element method, and take detailed structures of the gates into account. |
| Keywords | unsteady flow lake flow finite element method |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2000-02-29 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 31 |
| End Page | 34 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313848 |
| JaLCDOI | 10.18926/fest/11543 |
|---|---|
| Title Alternative | Fertilizer Microencapsulated with Biodegradable Polymer |
| FullText URL | 007_127_131.pdf |
| Author | Futaki, Sakae| Yoshizawa, Hidekazu| Matsuo, Mitsunori| Kusumoto, Masahiko| Kitamura, Yoshiro| |
| Abstract | Many fertilizers are soluble in water, therefore their effect does not last for long time after fertilizing in soils. The nitrogenous fertilizers such as urea transported to groundwater cause serious agricultural contamination and health problems. To solve these problems, sustained release of fertilizer has attracted much attention. In this study, we attempted to prepare polylactide microcapsules with fertilizer by phase separation technique, which was a method of microencapsulation. Polylactide (PLA) was used as a biodegradable polymer bacause the biodegradable polymer has no influence on the soil and the ecosystem. The effect of preparation conditions such as stirring time and fertilizer concentration on morphology of microcapsule and on cumulative percentage released of enclosed urea was also investigated. |
| Keywords | fertilizer polylactide microcapsule controlled release phase separation |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2002-03-22 |
| Volume | volume7 |
| Issue | issue1 |
| Start Page | 127 |
| End Page | 131 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313894 |
| JaLCDOI | 10.18926/fest/11534 |
|---|---|
| FullText URL | 007_099_106.pdf |
| Author | Kamboh Maqsood Ahmed| Oki, Yoko| Adachi, Tadashi| |
| Abstract | A few wheat varieties including two Japanese wheat varieties were evaluated for their salt tolerance at seeding stage, their behavior to increasing salinity levels and role of Na exclusion capacity in salt tolerance mechanisms. The wheat varieties were grown in nutrient solution and subjected to 0 (control), 25,75 and 125 mM NaCl salinity levels for 7 days. Although the shoot growth was reduced while Na contents were increased progressively with increasing salinity in all varieties, the varieties were quite different in their response. Salt tolerant va rieties maintained less reduction in their root and shoot growth and better water relations in their shoots than salt sensitive varieties under saline conditions. The wheat varieties were quite different in their Na exclusion capacity. Poor growth in salt sensitive varieties might be due to higher accumulation of Na in their shoots resulting from low Na exclusion capacity of roots, higher Na transport to shoot and/or inferior compartmentation capability. |
| Keywords | growth and mineral composition increasing salinity Na exclusion capacity salt tolerance wheat varieties |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2002-03-22 |
| Volume | volume7 |
| Issue | issue1 |
| Start Page | 99 |
| End Page | 106 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313704 |
| JaLCDOI | 10.18926/fest/11533 |
|---|---|
| Title Alternative | Management of Rural Region in Association with Its Regionality of the Western Part of Tottori Prefecture |
| FullText URL | 006_053_065.pdf |
| Author | Ichiminami, Fumikazu| |
| Abstract | In this paper the brief history, the status quo and the problem of regional management in association with its regionality were examined in Yodoe town and Mizokuchi town in the western part of Tottori Prefecture. These areas have the focus of Yonago city. Mt. Daisen and Kaike-spring have been well-known, and Tottori Flower Park recently attracts many tourists. However, agriculture also flourishes remarkably in these areas. Although Yodoe town has been celebrated for the waters and traditional umbrella, the town management recently makes the most of acorn and ancient tombs, giving emphasis to international relations and history. In Mizokuchi town the oldest legend of ogre has been investigated intently and the town management in connection with it has been proceeded. As these plannings use their histories and features peculiar to the area as a management concept, they have high originality. As a future problem, it may be necessary to built up a closer connection and coordinate each regional functions within the extensive areas. |
| Keywords | The Western Part of Tottori Prefecture Rural Area Regionality Regional Coordination of Functions |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2001-02-28 |
| Volume | volume6 |
| Issue | issue1 |
| Start Page | 53 |
| End Page | 65 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002314021 |
| JaLCDOI | 10.18926/fest/11529 |
|---|---|
| FullText URL | 006_041_045.pdf |
| Author | Adam Ihab| Sakata, Kenji| Ayano, Toshiki| |
| Abstract | Inclusion of aggregates leads to a reduction in drying shrinkage of cement paste. This is due to the elastic deformation of the aggregates that partly restrains the shrinkage deformation of cement paste. Hence, concrete with higher aggregate content exhibits smaller shrinkage. In addition, concrete with aggregates of higher modulus of elasticity or of rougher surfaces is more resistant to shrinkage process. In this paper the effects of the type of coarse aggregate on the shrinkage of normal and high-strength concretes are investigated. Two different types of crushed stone were used as coarse aggregates to produce the concrete mixtures used in this study. For each coarse aggregate type, two normal-strength concrete (NSC) mixtures and two high-strength concrete (HSC) mixtures were prepared. The 28-day compressive strength values of NSC mixtures were about 35 and 50 MPa, while those of HSC mixtures were 70 and 100 MPa, respectively. All shrinkage specimens were cured in water for 14 days after casting, then exposed to drying under the conditions of constant temperature (20℃) and relative humidity (60%). It has been shown that the type of the coarse aggregate influences shrinkage behaviour of both normal and high-strength concretes. |
| Keywords | Shrinkage Coarse aggregate High-Strength Concrete Silica Fume |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2001-02-28 |
| Volume | volume6 |
| Issue | issue1 |
| Start Page | 41 |
| End Page | 45 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313637 |
| JaLCDOI | 10.18926/fest/11513 |
|---|---|
| Title Alternative | Decontamination of Waste-water by Metal Phthalocyanines Encapsulated in Polymeric Microcapsules |
| FullText URL | 008_097_101.pdf |
| Author | Takami, Koji| Yoshizawa, Hidekazu| Sakata, Isao| Kitamura, Yoshiro| |
| Abstract | Polymeric microcapsules encapsulating iron phthalocyanine (Fe-Pc) and zinc phthalocyanine (Zn-Pc) were successfully prepared in this study. Absorption spectra of polymeric microcapsules encapsulating metal phthalocyanines were measured in visible light range. It was expected from the results that the polymeric microcapsules encapsulating metal phthalocyanines showed high photocatalytic activity upon irradiation with visible light such as sunlight. The catalytic and phtocatalytic activities of encapsulated Fe-Pc and Zn-Pc were investigated in the decomposition of methylene blue in water. The encapsulatedd Fe-Pc with H(2)O(2) exhibited a high catalytic activity. Methlene blue was efficiently decomposed by interaction of Fe-Pc with H(2)O(2). |
| Keywords | microcapsule decomposition metal phthalocyanine waste-water treatment suspension polymerizatio |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2003-03 |
| Volume | volume8 |
| Issue | issue1 |
| Start Page | 97 |
| End Page | 101 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313830 |
| JaLCDOI | 10.18926/fest/11502 |
|---|---|
| FullText URL | 010_083_088.pdf |
| Author | Kankam-Yeboah Kwabena| Darko Philip K.| Nishigaki, Makoto| |
| Abstract | Groundwater has been recognised as the most cost-effective option of safe water supply to rural communities in Ghana. The demand for potable water has led to the drilling of a large number of boreholes in many parts of the country. To establish the threshold of groundwater development from storage in a major river catchment (Pra River) in South-West Ghana, studies on recharge to the weathered aquifer and statistical evaluations of specific capacity and potential yield have been carried out. The SACSMA conceptual hydrological modelling system was used for the recharge estimate. With recharge rate of 50 mm/yr, the natural groundwater resources in the basin was estimated to support a maximum withdrawal of 12 l/s for a 10 hour per day pumping. The groundwater resources potential of 1.6 l/sｋ㎡ could be considered the threshold of groundwater exploitation in similar river basins in South-West Ghana. A study into the relation between permeability and recharge under different conditions and scenarios is required to define their limiting role in groundwater resources development. |
| Keywords | Groundwater storage recharge aquifer specific capacity base flow hydrologic budget |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2005-02-28 |
| Volume | volume10 |
| Issue | issue1 |
| Start Page | 83 |
| End Page | 88 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313829 |
| JaLCDOI | 10.18926/fest/11501 |
|---|---|
| FullText URL | 010_075_081.pdf |
| Author | Kankam-Yeboah Kwabena| Asare Enoch B.| Gyau-Boakye, Philip| Nishigaki, Makoto| |
| Abstract | The rapid impact assessment (RIAM), which was developed in Denmark, is a new tool for the execution of environmental impact assessments. RIAM is quite flexible, transparent and leaves a permanent record, which can be independently checked, validated or updated. RIAM has successfully been used to prioritize water resources management problems in Ghana in the order of which problems call for the most urgent attention. The priority list was easily validated and accepted to be the true reflection of the situation at a national workshop in which experts and representatives from water agencies, donor agencies, university faculties and departments, research institutes, private institutions and organizations including Non Governmental Organizations (NGOs) participated. The study has shown that RIAM, which can also be used in a developing country like Ghana, is a very useful tool in such prioritization process as has been applied in this exercise. |
| Keywords | Water resources management problems prioritization impact indicators RIAM river basins Ghana |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2005-02-28 |
| Volume | volume10 |
| Issue | issue1 |
| Start Page | 75 |
| End Page | 81 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313917 |
| JaLCDOI | 10.18926/fest/11500 |
|---|---|
| FullText URL | 008_039_052.pdf |
| Author | Kankam-Yeboah Kwabena| Dapaah-Siakwan Stephen| Nishigaki, Makoto| Komatsu, Mitsuru| |
| Abstract | Increasing human population, changing lifestyles and environmental considerations have resulted in increased utilization of groundwater resources worldwide. Thus, in turn, has led to the decline of groundwater levels in some countries and Ghana is no exception to this problem. To augment the availability of groundwater resources for various uses, numerous techniques have been developed in many part of the world, one of which is the construction of underground dams. The successful construction and utilization of underground dams, however, depends very much on the physical and hydrogeological conditions at the dam sites. Ghana is underlain by Precambrian crystalline igneous and metamorphic rocks ; and Paleozoic consolidated sedimentary formations. There are further subdivided and described locally as the Birimian, Dahomeyan, Buem, Togo Series, Tarkwaian, Granites, Voltain, Coastal Block Fault, Coastal Plain and Quaternary Alluvium. The review of these and the pre-requisite conditions necessary for the construction of underground dams indicate that underground dams could be constructed and utilized in some parts of Ghana, especially where the overburden is shallow, in the Dahomeyan granites and in the recent formations consisting of alluvial and coastal sands and gravels. This paper is part of a continuing research programme being carried out by the authors. |
| Keywords | hydrogeology geology underground dam sand-storage dam sub-surface dam water supply |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2003-03 |
| Volume | volume8 |
| Issue | issue1 |
| Start Page | 39 |
| End Page | 52 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313713 |
| JaLCDOI | 10.18926/fest/11497 |
|---|---|
| FullText URL | 008_023_026.pdf |
| Author | Watanabe, Masaji| Numaguchi Satoshi| |
| Abstract | The global positioning system (GPS) is utilized for analysis of flows in the water environment. A float equipped with a GPS unit is designed to drift on the surface of the water. Its driving force is the fluid resistance exerted on a pair of rectangular plates. While it travels over the surface, the GPS unit evaluates its position every second, and spatiotemporal data that specify its motion are transmitted to be recorded. Results of experiments conducted to study unsteady flows generated in Kojima Lake are introduced. |
| Keywords | water environment global positioning system |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2003-03 |
| Volume | volume8 |
| Issue | issue1 |
| Start Page | 23 |
| End Page | 26 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313912 |
| JaLCDOI | 10.18926/fest/11496 |
|---|---|
| FullText URL | 010_057_065.pdf |
| Author | Dewan Ashraf M.| Alam Md. Mahabubul| Nishigaki, Makoto| |
| Abstract | This paper is an attempt to develop a series of maps that precisely depict flood prone areas in Greater Dhaka, Bangladesh using remote sensing techniques. Multi-temporal RADARSAT SAR data were acquired and employed to delineate open water flood boundary during the floods of 1998 and 2000. Using a threshold algorithm, SAR data is segregated into water and non-water areas. The empirical threshold value was obtained by using visual interpretation technique, local knowledge of the study site and by deriving corresponding pixel values to land/water from each image. The result demonstrated that 53 percent of the study area was heavily inundated in 1998 flood which is the largest submerged area during a catastrophic scenario. In contrast, 35.32 percent area was flooded during the year 2000 which represents the area under water for a normal event. Using the reference data acquired from field visit, derived flood maps were further validated. Moderate accuracy is obtained for all flood maps, however, July 1998 image attained the highest overall accuracy (86%) in the dataset. The derived flood maps are expected to be useful to mitigate losses of lives and property from river water flooding in Greater Dhaka. Furthermore, this information would be worthwhile to develop an efficient flood disaster management system. |
| Keywords | SAR open water flood 1998 and 2000 floods Greater Dhaka RADARSAT |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2005-02-28 |
| Volume | volume10 |
| Issue | issue1 |
| Start Page | 57 |
| End Page | 65 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313953 |
| JaLCDOI | 10.18926/fest/11484 |
|---|---|
| FullText URL | 010_023_028.pdf |
| Author | Watanabe, Masaji| Liu Ying| Wang Ming Jun| |
| Abstract | Topographical data of Kojima Lake have been updated by applying data obtained after dredging. Together with tide level of Kojima Bay and water levels of Kurashiki River and Sasagase river, the information was incorporated in computational analysis of unsteady flows generated in the lake when the water was discharged from Kojima Lake to Kojima, Bay. A finite element method was applied to equations governing unsteady flows, and the transition of discharge was obtained. |
| Keywords | water environment finite element method numerical simulation |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2005-02-28 |
| Volume | volume10 |
| Issue | issue1 |
| Start Page | 23 |
| End Page | 28 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313649 |
| JaLCDOI | 10.18926/fest/11469 |
|---|---|
| Title Alternative | Measurement of thermal conductivity in soils and application of de Vries model |
| FullText URL | 009_117_120.pdf |
| Author | Moroizumi, Toshitsugu| Sato, Yuichi| Sato, Koichi| Sasaki, Choichi| |
| Abstract | Thermal conductivity of soil samples were measured using a twin transient-state cylindrical-probe method. The system of measurement consists of DC power supply, data logger, personal computer, 100cc soil sample, reference material sample, and two heat probes. The typical results were as follows: (1) Thermal conductivity of soils increased according to an increase of soil water content. (2) The thermal conductivity of Toyoura sand was larger than one of Kuroboku soil. (3) The thermal conductivity estimated by de Vries model had good agreement with the measured value. |
| Keywords | Thermal conductivity Twin transient-state cylindrical-probe method de Vries model Volumetric water content |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2004-02-27 |
| Volume | volume9 |
| Issue | issue1 |
| Start Page | 117 |
| End Page | 120 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313616 |
| JaLCDOI | 10.18926/fest/11466 |
|---|---|
| FullText URL | 009_099_110.pdf |
| Author | Dewan A.M.| Nishigaki, Makoto| Komatsu, Mitsuru| |
| Abstract | Dhaka city, the capital of Bangladesh and home for more than 10 million people, has been affected by seasonal flooding almost in every year, however, the situation aggravates depending on rainfall and surrounding river waters. The aim of this paper is to delineate the flood extent in Dhaka city using digital elevation model (DEM), an integral part of geographic information system. Catastrophic floods of the 1988 and 1998 events are taken into consideration. Hydro-meteorological assessment of these events revealed that the 1988 flood was severe due to the lack of flood protection in the city together with transboundary flow of the major rivers while the 1998 flood was become deluge due to incessant monsoonal downpour along with early peaked of the river water levels. The 1998 event has done colossal damage in the city compare to the 1988 event. Flood extent estimation showed that DEM data is very precious to model inundation in the city, however, in order to be spatially explicit flood model, high resolution DEM is necessary. Finally, flood management issues are reviewed and found that combination of structural and nonstructural measures are necessary to help reducing flood induced losses and damage in the city. |
| Keywords | Dhaka City Floods Digital Elevation Model 1998 and 1988 Floods |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2004-02-27 |
| Volume | volume9 |
| Issue | issue1 |
| Start Page | 99 |
| End Page | 110 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313678 |
