排序方式： 共有6条查询结果，搜索用时 812 毫秒
1
1.
2.
Natural Hazards - Recent heavy rainfall events and flash floods in Ellicott City, Maryland, highlight the importance of having robust and up-to-date estimates of precipitation frequency. NOAA Atlas... 相似文献
3.
Although oil barriers have been used for many years to contain slicked oil in open seas, the effect of waves on them has been rarely considered. In the present study, we investigated the response of rigid and flexible oil containment barriers in the presence of currents with and without waves. Two-dimensional experiments with both rigid and flexible oil containment barriers were carried out in a laboratory flume equipped with a pneumatic wave generator. The initiation of containment failure for various conditions were analyzed and compared.In the course of this study, the effect of wave characteristics on containment failure was discussed and some empirical equations were proposed to predict the initiation of failure in different conditions. Once the failure started, the effect of wave steepness on the loss rate was investigated. Finally a failure mode occurring due to the waves’ effect, called surging drainage failure, was studied. 相似文献
4.
O. Aminoroayaie Yamini S. Hooman Mousavi M. R. Kavianpour Azin Movahedi 《Environmental Earth Sciences》2018,77(23):776
In recent years, with daily progress in technology, application of wind turbines for energy generation has become common all around the world. Installation of these turbines at sea encountered a great deal of challenge. One of the most important challenges is scouring around the piles of these turbines due to sea waves and current interaction. Many studies have been conducted in this respect; however, the results are insufficient, and the phenomenon remains poorly understood in tripod wind turbines. In this work, an attempt is made by combining the waves and currents, and changing the substructure of the turbine and the type of the bed materials, to extend the investigation of this phenomenon. The current research is focused on presenting the trend of changes in the amount of scouring. By changing the conditions (including variation in the wave height, variation of the current velocity, variation of the pile diameter, and variation in the size of bed particles), one can arrive at an appropriate estimate and prediction of the shape and the depth of the scour pit. 相似文献
5.
Azin Movahedi M. R. Kavianpour Omid Aminoroayaie Yamini 《Environmental Earth Sciences》2018,77(8):320
Flip buckets are often used at the end of chute spillways to dissipate energy and direct flow to submergence plunge pool and especially in large dams. Flip buckets with central deviation also are a specific and new design of these buckets that have a transverse slope and are mixed in plan with a curvature. In this paper, the experimental and numerical simulation study of sediment scouring in such flip bucket has been targeted. Extensive experimental data are obtained from physical model studies conducted at Water Research Institute, Iran. The flow field with various flood discharges in a range of Froude numbers (Fr?=?\(V/\sqrt {gh}\): 3.5–7.5) in Flow3D model was compared to experimental results obtained from a similar model. Analyzing the simulated models in the Flow3D model and comparing the results with the experimental model, the hydraulic parameters of the pressure, velocity and depth of flow are determined. Considering the accuracy of the numerical model in simulating bed scouring, this model can be used for similar cases in large dams. The results of the simulation model compare well with the experimental results in parameters of the maximum scour depth, profile scouring and the ridge height which accumulates around downstream of the scour hole. This investigation improves the understanding of bed topography effects of downstream dams in high-velocity jet impact based on experimental observations and simulation analysis. 相似文献
6.
Mansourpoor Mojtaba Azin Reza Osfouri Shahriar Izadpanah Amir Abbas Saboori Rahmatallah 《Natural Resources Research》2019,28(4):1609-1617
Natural Resources Research - In this work, we studied the feasibility of using disulfide oil (DSO) as a solvent for wax prevention in pipelines. Several tests were carried out to determine the... 相似文献
1