Doboku Gakkai Ronbunshu
Online ISSN : 1882-7187
Print ISSN : 0289-7806
ISSN-L : 0289-7806
Search
Advanced search
OR
Browse
Search
Volume 1996, Issue 545
Displaying 1-12 of 12 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • NEW THERMAL SENSATION INDEX FOR OUTDOOR ENVIRONMENT
    Manabu Kanda, Norikazu Yanagimoto, Masaaki Ukaji
    1996 Volume 1996 Issue 545 Pages 1-10
    Published: August 21, 1996
    Released on J-STAGE: August 24, 2010
    DOIhttps://doi.org/10.2208/jscej.1996.545_1
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Laboratory experiments were performed in a climate simulator, in which temperature, humidity, wind and insolation can be controlled, to investigate human physiological response and thermal comfort. The experimental results show that 1) variation of metabolic ratio with meteorological conditions can be ignorabie, 2) sensible heat from body make much effect to decrease skin temperature, and 3) thermal situation of human body is unsteady. Based on these experimental results, Virtual Thermal Load is proposed as a new thermal sensation index for outdoor human environment. The only one physiological parameter ‘β’ is formulated as a function of VTL. VTL agrees very well with thermal sensation.
    View full abstract
    Download PDF (1185K)
  • STOCHASTIC RESPONSE OF DISTRIBUTED RUNOFF MODELS BASED ON CHARACTERISTICS OF A DRAINAGE BASIN TOPOGRAPHY
    Hiroshi Hayakawa, Mutsuhiro Fujita, Kunihide Uchijima
    1996 Volume 1996 Issue 545 Pages 11-22
    Published: August 21, 1996
    Released on J-STAGE: August 24, 2010
    DOIhttps://doi.org/10.2208/jscej.1996.545_11
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Recently, the increasing availability of spatial and temporal distributed hydrologic data is encouraging the use of distributed runoff models. This paper assumes that the most general representation of topography and rainfall is a random field, so that the rainfall-runoff system is best described by stochastic differential quation. The main object of this paper is to make clear one universal subbasin scale in the context of distributed runoff model. For this purpose, we pay attention to the variance of discharge at the outlet and propose how to solve the variance theoretically. Finally, we can obtain the relationship between the variance and the subbasin scale theoretically.
    View full abstract
    Download PDF (1516K)
  • STUDY ON THE TRANSPORTATION PROCESS OF BED MATERIAL LOAD
    Masato Sekine, Daikichi Ogawada, Yosinobu Satake
    1996 Volume 1996 Issue 545 Pages 23-32
    Published: August 21, 1996
    Released on J-STAGE: August 24, 2010
    DOIhttps://doi.org/10.2208/jscej.1996.545_23
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Bed material load has been analyzed under its classification into bed load and suspended load. But several problems arised associated with such a framework of analysis. In the present paper, the transportation process of Bed material load is studied thriugh a unified simulation model which is constructed as an extension of original saltation model. As a result of this analysis, the influence of turbulent velocity fluctuation on the moving trajectory, a concetration distribution and a moving velocity distribution of sediment are all made clear. It's a first attempt to seek a unified theory of Bed material load in the literature.
    View full abstract
    Download PDF (1242K)
  • GRAVITY FLOW OF SEDIMENT-WATER MIXTURES IN A STEEP OPEN CHANNEL
    Haruyuki Hashimoto, Muneo Hirano
    1996 Volume 1996 Issue 545 Pages 33-42
    Published: August 21, 1996
    Released on J-STAGE: August 24, 2010
    DOIhttps://doi.org/10.2208/jscej.1996.545_33
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    There occurs two-layer flow of sediment-water mixtures in an open channel with slopes of 0.087-0.176, when the coarser sand and gravel are used as sediment bed. This flow is composed of the upper layer with smaller concentration, which is almost clear water and the lower layer with larger concentration. This is an intermediate type of sediment transport between bed load and debris flow. The equations of velocity profile and average sediment concentration were obtained theoretically. The thickness of the lower layer was estimated experimentally. Integrating velocity profile yields average velocity and fluxaveraged concentaation. On the basis of these results sediment discharge formula was derived.
    View full abstract
    Download PDF (1243K)
  • EXPERIMENTAL STUDY ON THE FLOW CHARACTERISTICS OF A GRADUALLY EXPANDING OPEN CHANNEL FLOW
    Kouki Onitsuka, Masaru Ura, Juichiro Akiyama, Shin Sakamoto, Katsushi ...
    1996 Volume 1996 Issue 545 Pages 43-54
    Published: August 21, 1996
    Released on J-STAGE: August 24, 2010
    DOIhttps://doi.org/10.2208/jscej.1996.545_43
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Flow fields of gradually expanded rectangular open channel flows are investigated experimentally. The trend of loss coefficient against divergence is similar to Gibson's results for Diffusers. Mean velocity profiles along the spanwise direction and the vertical direction can be, respectively, expressed by Goertler's equation for 2-D jets and the log-wake law. The wake strength parameter II increases in the flow direction. The secondary flow affects the distributions of a mean velocity, production of turbulence and intensity of turbulent energy.
    View full abstract
    Download PDF (1817K)
  • NUMERICAL ANALYSIS OF PRESSERIZED FLOW IN UNDERGROUND DIVERSION CHANNEL
    Noboru Sukegawa, Kayoko Kurisaki, Tsuyoshi Tomita, Masashi Obuchi
    1996 Volume 1996 Issue 545 Pages 55-67
    Published: August 21, 1996
    Released on J-STAGE: August 24, 2010
    DOIhttps://doi.org/10.2208/jscej.1996.545_55
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    An underground diversion channel is composed of vertical shafts and a tunnel. The continuity and dynamic equations that describe the oscilations of the water level in the vertical shafts, and the discharge and the pressure in the tunnel are derived by considering the motion of the water in the vertical shafts. The numerical method for solving these equations are discussed. The calculated values of the oscillations of the water level in the vertical shafts and the pressure in the tunnel are agreed very well with the experimental values.
    View full abstract
    Download PDF (1518K)
  • VELOCITY AND BOUNDARY SHEAR STRESS DISTRIBUTION IN TRAPEZOIDAL UNIFORM CHANNELS WITH MILD SIDE WALLS
    Masashige Yamasaka
    1996 Volume 1996 Issue 545 Pages 69-78
    Published: August 21, 1996
    Released on J-STAGE: August 24, 2010
    DOIhttps://doi.org/10.2208/jscej.1996.545_69
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Recently, a variety of plane forms and cross-sectional forms are applied to river designing in order to introduce a lot of naturalization to river environments. One of them is milder lateral slopes of side banks. In the present study, velocity and boundary shear stress distribution in trapezodal uniform channels with mild side walls are derived analytically, with the eddy viscosity which depend on local water depth and shear velocity. Calculated velocity distribution is compared with observed data of laboratory experiment. Calculated boundary shear stress distributions are compared with simple methods, which are called vertical depth method and normal depth method.
    View full abstract
    Download PDF (1120K)
  • EFFECTS OF A GENTLE-SLOPE SEA DIKE ON BOTTOM TOPOGRAPHY
    HYDRAULIC EXPERIMENTS WITH NORMALLY INCIDENT MONOCHROMATIC WAVES
    Toshihiko Takahashi, Atsushi Numata, Nobuo Shuto
    1996 Volume 1996 Issue 545 Pages 79-88
    Published: August 21, 1996
    Released on J-STAGE: August 24, 2010
    DOIhttps://doi.org/10.2208/jscej.1996.545_79
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Two series of experiments are carried out. The first is the sea bottom change with and without a gentle-slope sea dike, after eroding and acceting waves are alternately applied. The second compares effcets of the location of the dike, when a train of eroding waves is applied for many hours. The dike effectively works to stop the shoreline retreat, as long as beach sands are on the dike. Depending on the location of the dike, the dike works worse than a natural beach to reduce beach sands. The maximum scouring depth and the damage condition of foundation works are expressed as functions of the location of dike and the duration of waves.
    View full abstract
    Download PDF (1322K)
  • EVALUATION OF THE ENVIRONMENTAL QUALITY BY INDICATION OF BENTHIC MACROINVERTEBRATE FAUNA ON SEVERAL URBAN SPRINGBROOKS
    Kazuhiko Baba, Hongxin Mao, Kiyoshi Iwashima
    1996 Volume 1996 Issue 545 Pages 89-99
    Published: August 21, 1996
    Released on J-STAGE: August 24, 2010
    DOIhttps://doi.org/10.2208/jscej.1996.545_89
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The benthic macroinvertebrate faunas and the habitat factors were invesigated on urban springbrooks in the Tama area of Tokyo. A total of 43 taxa were found, 35 of which were insects. An isopod, Asellus hilgendorfii was the most abundant, and Chironomidae, Baetis spp., Nemoura spp., Apatania abberans and Smiulium spp. were usual as insect. The correspondence relationship between the fauna and the habitat factors was analyzed, and the biotic indices for envronmental quality of springbrook were estimated on the main taxa. With the results, new methods were examined, which be expected to use for evaluation of environmental quality on springbrooks.
    View full abstract
    Download PDF (1424K)
  • STUDY ON THE WATER QUALITY MANAGEMENT IN SETO INLAND SEA BY USING THE WATER AND SEDIMENT QUALITY MODEL
    In-cheol Lee, Masao Ukita, Masahiko Sekine, Hiroshi Nakanishi
    1996 Volume 1996 Issue 545 Pages 101-112
    Published: August 21, 1996
    Released on J-STAGE: August 24, 2010
    DOIhttps://doi.org/10.2208/jscej.1996.545_101
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    By using the water-sediment quality model (WSQM), the numerical experiments were carried out for the management of water quality in the Seto-Inland Sea. A formula roughly forecasting water quality to estimate the effect of loading abatement was proposed. According to analysis of loading abatement, it was shown that relatively large effort of abatement would be required in the eastern Seto-Inland Sea, from Bisan Seto to Osaka bay, and that not only TP but TN load abatement was also required. On the other hand, it was indicated that the increase of loading lead to increase of the primary production, while not straightly to increase of fish catchment.
    View full abstract
    Download PDF (1789K)
  • STUDY ON POLLUTION LOAD ANALYSIS OF TRIHALOMETHANE FORMATION POTENTIAL
    Chun Mo Zhu, Masao Ukita, Hiroshi Nakanishi, Tsuyoshi Imai
    1996 Volume 1996 Issue 545 Pages 113-123
    Published: August 21, 1996
    Released on J-STAGE: August 24, 2010
    DOIhttps://doi.org/10.2208/jscej.1996.545_113
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    In this study, trihalomethane formation potential (THMFP) was considered a kind of water quality item, same as COD, or BOD. The discharge of THM precursor from various sources, and its runoff process to public water area were illustrated using pollutant-load- factor method for quantitative study. As a case study, the pollution load analysis of THMFP in KOTOH river basin was also carried out. The results in dicated that about 50% of pollution load of THMFP was attributed from nature. It was shown that the pollutant-load- factor method was effective for the management of THM polluted in river basins.
    View full abstract
    Download PDF (2479K)
  • NUMERICAL ANALYSIS OF WATER LEVEL RESPONSE IN FISH POND BY TIDAL MOTION THROUGH WEIR AND GATE
    Kunihiro Ogihara, Shuzo Tanaka, Yoshitaka Fukui, NADJADJI Anwar
    1996 Volume 1996 Issue 545 Pages 125-129
    Published: August 21, 1996
    Released on J-STAGE: August 24, 2010
    DOIhttps://doi.org/10.2208/jscej.1996.545_125
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Supply of water to the fish ponds from a tidal river depends on the response of water level in ponds due to the tide motion through the weir and gate. The most simple case is introducing single fish pond connected to a tidal river and the flow over the weir can be applied Dr. M. Homma's equation. The patterns of flows over the weir are four cases. Those are free flow and submerged flow in both directions river to pond and pond to river. This paper is sumarized numerical analysis of water level respons in fish ponds using trial data and comparing to the measurement data from model experiment.
    View full abstract
    Download PDF (463K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top