Abstract The shape of a narrow river with steep slope and high intensity rainfall can affect the speed flow so that it has an impact on changes in dynamics have potential to cause erosion riverbed. This condition affects morphological emergence degradation agradation phenomena certain areas. To determine effect changes, laboratory tests were carried out using permeable type groyne structure as ...

In this paper, an analytic solution to the scattering of water wave by submerged permeable breakwaters in infinite-depth is presented. The velocity field around breakwater under linear train deep condition sought formulating a nonhomogeneous Riemann-Hilbert problem. To deal with nonlinearity due permeability plates, perturbation method applied terms small parameter representing permeability. We...

Invasions by alien species may cause a decline in populations of vulnerable protected species through interference and resource competition. During the last decade, four invasive goby species of Ponto-Caspian origin have displayed rapid dispersal in The Netherlands. High densities of these species have been recorded in large rivers and hydrologically connected water bodies such as canals and fl...

We use droplet microfluidics to produce monodisperse elastomeric microbubbles consisting of gas encapsulated in a polydimethylsiloxane shell. These microbubbles withstand large, repeated deformations without rupture. We perform μN-scale compression tests on individual microbubbles and find their response to be highly dependent on the shell permeability; during deformation, the pressure inside i...