Dimensional Model Tests Research Articles

Prediction of Mean Water Level Rise Behind Low-Crested Structures and Outflow Velocity from Openings by Using a Hybrid Method Based on Two Dimensional Model Test and Hydrodynamic Numerical Modeling

ì €ë§ˆë£¨êµ¬ì¡°ë¬¼ì˜ ì•ˆì •ì„± 및 배후 호안의 월파량은 배후수역의 수위에 영향을 받음에도 단면 수리모형실험수행 시 수위상승량이 ì•Œë ¤ì§€ì§€ 않아 계측 결과가 ì™œê³¡ë ìˆ˜ 있다. 본 연구에서는 ì €ë§ˆë£¨ 구조물 ì œì²´ 배후면의 í‰ê· ìˆ˜ìœ„ 상승량을 예측하기 위해 단면수리모형실험과 í•´ìˆ˜ìœ ë™ìˆ˜ì¹˜ëª¨í˜•ì‹¤í—˜ì„ 수위-ìœ ëŸ‰ 관계식으로 결합하는 결합기법을 시도하였다. 이 기법을 사용함으로써 í‰ê· ìˆ˜ìœ„ 상승량과 ìœ ì†ìž¥ì„ 단면수리모형실험과 동시간대에 얻을 수 있어 이러한 ë¬¸ì œì ë“¤ì„ 상당한 수준으로 í•´ì†Œí• ìˆ˜ 있게 되었다. 또한 구조물의 개구부를 통한 ìœ ì¶œìœ ì†ì˜ 강도에 관해서도 ê°œëžµì ì¸ ì •ë³´ë¥¼ 얻을 수 있어 ì €ë§ˆë£¨êµ¬ì¡°ë¬¼ì˜ ì ì • 평면배치안 ì„ ì •ì—ë„ 도움이 ë ìˆ˜ 있다. 핵심용어: ì €ë§ˆë£¨êµ¬ì¡°ë¬¼, 수위 상승, ìœ ì¶œìœ ì†, ë°©íŒŒì œ 설계, ì´ì•ˆì œ, 결합기법

A new formula for front slope recession of berm breakwaters

The front slope stability of breakwaters with a homogeneous berm was studied in a large number of two dimensional model tests at Aalborg University, Denmark. The results are presented together with a new formula for prediction of the berm recession which is the most important parameter for describing the reshaping. The formula has also been calibrated and validated against model test data from other researchers. The significance of the new design formula is that it predicts berm recession much better than the existing methods, especially in case of more stable structures.

Model tests on eccentrically and obliquely loaded footings resting on reinforced sand

In the present paper, two and three dimensional model tests have been conducted to study the behavior of strip and square footing subjected to eccentric — inclined load resting on unreinforced sand and reinforced sand. The effect of soil reinforcement (number of layers and size of reinforcement) and effect of load inclination and eccentricity of load on some relevant parameters, such as, ultimate bearing capacity, vertical settlement (<i>S_e</i>), horizontal displacement (<i>H_d</i>) and tilt (<i>t</i>) of the footings is presented, in this paper, in graphical as well as tabular forms.

導水板を用いた長周期波対策構造物の平面波浪場における水理特性について

In many ports in Japan, long-period waves cause disturbances of cargo handling and breaks of mooring ropes. We developed a new type of long-period wave absorption structure which involves two oblique walls and a vertical slit between them. The performance of various structural types of them has been examined by two dimensional hydraulic experiments.In this paper, the performance when installing proposed structure in an actual port is examined. We study the effect of the proposed structure to reduce standing wave height in the harbor by three dimensional model test and numerical experiment using boussinesq equation.

護岸背後に位置する家屋の越波による被災特性について

Seaside houses in Kamoenai Village were seriously damaged by Typhoon No. 18 in 2004. The damage patterns were classified according to wave overtopping rate and the distance from the seawall alignment. The wave overtopping rate and wave forces on the houses were reproduced by two dimensional model tests, and the critical condition of seaside houses behind the seawall was shown as the function of offshore wave height and the distance from seawall. Based on the results, the evacuation condition was recommended for the coastal residents in Kamoenai Village. It was also confirmed that the safety of seaside houses can be improved by wave absorbing revetments in front of seawalls.

Colour Preference: A New Approach

To date the use of the colour preference phenomenon in test studies has been associated with exclusive application of the categorical nature of colour perception. It seems justified to approach the phenomenon also from the angle of the hypothesis of priority of the dimensional coding processes that operate in colour perception. A model-type dimensional colour test involving the method of semantic differential has been devised. Using well-matched groups, the consistency of age, sex, and social dependency of the colour preference phenomenon can be clearly described in the dimensional approach. The test-retest reliability of the model test can be considered satisfactory for four of the six dimensions (0.67 to 0.84). The test is validated by comparison with the parameters of the Maudsley Personality Inventory and averaged personality ratings on a 70-item check list made by 16 or 17 peers. The dimensional model test can give better results than those produced by colour tests adopting the categorical approach.

LABORATORY STUDY OF SCALE EFFECTS IN TWO-DIMENSIONAL BEACH PROCESSES

In order to disclose the essential relationship between the beach processes and wave characteristics, two dimensional model tests are often performed for beach profile changes due to incident breaking waves normal to the beach. In applying the results of such experiments to the prototype of beaches, the scale effects of waves and sediments on the beach processes with equilibrium beach profiles should necessarily be considered.&#x0D; In this paper, as an approach to solve this problem in two dimensional beach studies, the effects of wave height and sediment size on the shore line movement and equilibrium beach profiles are discussed based on the results of experiments made by the authors and other experiments with smaller and larger scales by some researchers. It has been found that the ratio of wave height to sediment diameter is a very significant factor in this problem. In addition, the changes m a character of breaking waves during the time period of wave action from the beach having an initial constant slope to that with an equilibrium profile are presented.