relation: https://khub.utp.edu.my/scholars/9531/ title: Influence of forces on vehicle's instability in floodwaters creator: Shah, S.M.H. creator: Mustaffa, Z. creator: Yusof, K.W. creator: Nor, M.F.M. description: Flood hazards to vehicle have become more frequent and noticeable in the recent years. Therefore, this paper aims at estimating the forces observed on a partially submerged vehicle in floodwater, namely frictional, buoyancy, lift and drag forces. An understanding of the relevant forces involved is necessary to attempt to characterize the instability thresholds of vehicles in floodwater flows. With that regards, a model vehicle with the scale ratio of 1:24 was used and a series of flume experiments were conducted. While determining the vertical pushing force, the influence of lift force was found insignificant due to sub-critical state of the flow. Moreover, the critical water depth at which the up-thrust force governed was observed when the water depth exceeded 0.042 m. Below critical depth, the vehicle stability governed unless the drag force imposed by the flowing water was lower than the frictional force between the tires and floodplain surface. © 2018 Ain Shams University publisher: Ain Shams University date: 2018 type: Article type: PeerReviewed identifier: Shah, S.M.H. and Mustaffa, Z. and Yusof, K.W. and Nor, M.F.M. (2018) Influence of forces on vehicle's instability in floodwaters. Ain Shams Engineering Journal, 9 (4). pp. 3245-3258. ISSN 20904479 relation: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85056653652&doi=10.1016%2fj.asej.2018.01.001&partnerID=40&md5=733b8ce74867a4a7509888ad3fdb7740 relation: 10.1016/j.asej.2018.01.001 identifier: 10.1016/j.asej.2018.01.001