Abstract. Historical records are an important source of information on extreme and rare floods fundamental to establish a reliable flood return frequency. The use long historical for frequency analysis brings in the question stationarity, since climatic land-use conditions can affect relevance past flooding as predictor future flooding. In this paper, detailed 400 yr record from Tagus River Aranjuez (central Spain) was analysed under stationary non-stationary approaches, assess their...

The transport of wood material in rivers has been the subject various studies recent years. Most research focused on ecological and geomorphologic role wood, its recruitment processes spatial distribution streams. In this study, we dynamics, have developed a numerical model to simulate coupled with two-dimensional (2D) hydrodynamic model. For purpose, drag forces were incorporated as additional source terms into shallow water equations, which are solved together by using finite volume...

ABSTRACT Large woody material (LWM) transported by rivers may be entrapped at critical stream geometry configurations (e.g. bridges) and therefore dramatically increase the destructive power of floods. This was case in a Spanish mountain river where flood event with high degree LWM transport took place 1997. The aim this study to simulate bridge clogging process reconstruct wood deposit patterns, modelling individual pieces moving water flow interacting among them bridge. A two‐dimensional...

Sediment transport (bedload and suspension) plays a relevant role in the morphological response of river channels to large floods. load controls erosion aggradation patterns during high flows, drives migration macroforms contributes definition thresholds for bank channel instability. Given this influence on morphology, it is clear that sediment influences both geometry water stage reached floods should therefore be considered flood hazard analysis. So far, however, legislation management...

Abstract There is still wide uncertainty about past flash‐flood processes in mountain regions owing to the lack of systematic databases on former events. This paper presents a methodology reconstruct peak discharge flash floods and illustrates case an ungauged catchment Spanish Central System. The use dendrogeomorphic evidence (i.e. scars trees) together with combined two‐dimensional (2D) numerical hydraulic model terrestrial laser scan (TLS) has allowed estimation recent flood. size height...

This paper analyzes the anatomical response of Pinus pinaster Ait. following wounding by flash floods. A total 14 wood samples were taken from different scarred trees located on river banks Arroyo Cabrera torrent (Spanish Central System). In addition, 20 increment cores collected undisturbed and healthy P. to build a local reference chronology. For injured trees, analysis focused growth changes in early earlywood (EE) tracheids, namely differences (i) lumen size; (ii) cell-wall percentage...

Flash floods may influence the development of trees growing on channel bars and floodplains. In this study, we analyze quantify anatomical reactions to wounding in diffuse-porous (Alnus glutinosa L.) ring-porous (Fraxinus angustifolia Vahl. Quercus pyrenaica Willd.) a Mediterranean environment. A total 54 cross-sections wedges were collected from that had been injured by past flash floods. From each samples, micro-sections prepared at tangential distance 1.5 cm injury determine...

Abstract The reconstruction of past flash floods in ungauged basins leads to a high level uncertainty, which increases if other processes are involved such as the transport large wood material. An important flood occurred 1997 Venero Claro (Central Spain), causing significant economic losses. material clogged bridge sections, raising water upstream. aim this study was reconstruct event, analysing influence woody debris on hazard pattern. Because reach question affected by backwater effects...

Abstract. Among the natural hazards, flash flooding is leading cause of weather-related deaths. Flood risk management (FRM) in this context requires a comprehensive assessment social component. In regard, integrated vulnerability (ISV) can incorporate spatial distribution and contribution combined effect exposure, sensitivity resilience to total vulnerability, although these components are often disregarded. ISV defined by demographic socio-economic characteristics that condition...

Tipping bucket rain gauges (TBR) are widely used worldwide because they simple, cheap, and have low-energy consumption. However, their main disadvantage lies in measurement errors, such as those caused by rainfall intensity (RI) variation, which results data underestimation, especially during extreme events. This work aims to understand these types of identifying some causes through an analysis water behavior its effect on the TBR mechanism when RI increases. The mechanical biases effects...

ABSTRACT In‐depth knowledge of the fluvial corridor and surrounding slopes forest vegetation is needed for a better understanding wood recruitment or inputs to rivers. The information available in Central Spain on hydrogeomorphic processes distribution enabled evaluation potential from three sources: landslides, bank erosion transport during floods regional scale. method presented here based geographical system (GIS) multi‐criteria multi‐objective assessment using fuzzy logic principles....