Abstract

The recession of coastal cliffs is a widespread phenomenon on the rocky shores that are exposed to the combined incidence of marine and meteorological processes that occur in the shoreline. This phenomenon is revealed violently and occasionally as gravitational movements of the ground and can cause material or human losses. Their prediction is difficult, however it is basic for the proper coastal management and the clear understanding of erosion risks. There are several models of the coastal cliff recession processes. From the stochastic type models based on historical erosion events, to the theoretical models as described by Eikonal or Boussinesq equations. In this work an intermediate solution is adopted (process-response model), such as models based on simplified balance of forces as trigger mechanisms involved in the erosion of the rocks. This model fits the marine dynamics: sea level changes, tidal range and wave transformation, along with the evolution of the land: the slope of the surf zone, erosion and rock falls. So far these models have been limited to small slope cliffs, since its numerical stability and the propagation of errors are unknowns. For these reasons, the development of a generic model that reproduces the spatial and temporal evolution of a cliff-2D profile (platform, beach and slope) consisting on semi-consolidated heterogeneous materials, is presented. In addition, the computational implementation, the study of different numerical resolution techniques and the produced errors, are also exposed and analysed.

Abstract

Erosion caused by sand particles is a serious problem facing the oil and gas industry. Predicting pipe erosion due to sand transport is a complex process in multiphase flows due to the complex nature of the flow. Existing erosion studies are however focused on single phase flow conditions which are conservative and could lead to under-/over-engineering because actual fluid flow in pipelines is multiphase. There is therefore a need for in-depth analysis of the complex interaction between the multiphase fluid and transported sand particles. Document type: Part of book or chapter of book

Abstract

Proceedings of 7th Transport Research Arena : TRA 2018, VIENNE, AUTRICHE, 16-/04/2018 - 16/09/2018; Local scour is a major risk threatening the stability and sustainability of bridges across rivers and in coastal areas. The main purpose of this paper is to propose a monitoring technique based on the dynamic response of rods embedded in the riverbed. First, extensive laboratory tests are conducted to investigate the effect of scour on the vibratory response of different rods in sand and in saturated clay soil. Secondly, a numerical finite element model is developed and validated with these laboratory tests. This model is then used to assess the effect of the added mass of water on the sensor. Finally, based on the numerical and experimental results, a simplified analytical cantilever model is proposed to correlate the dynamic response of the rods to the current scour depth. Document type: Conference object

Abstract

The present research describes and analyzes the impacts of the anthropic transformation of the coastal strip of the city of Trujillo, due to the systematic construction and expansion of a rigid structure called sand retaining mill in the port of Salaverry. It is described and analyzed the impacts of the anthropic transformation of the strip and its consequences due to the construction of the retention molon. Satellite images, photographs and hydrographic charts were used for the respective analysis seeking to raise awareness and encourage scientists, authorities and citizens in general to conserve the coast and save it. The main impacts are referred to the modification of the coast line, adding the destruction of beaches and the alteration of ecosystems. Erosion as a phenomenon has been affecting many coastal areas, but in this one in particular the problem has increased and seems not to stop even knowing all the aspects and climatic impacts that this may generate, destabilizing natural habitats and changing the behavior of the tides by directing them to unforeseen areas. With the problem posed.