The evolution of alluvial megafans has mainly been investigated in unconfined settings; however, at the boundary these large depositional systems, development fluvial channels can be affected by structural constraints with regional extent. Here we present study eastern sector megafan Isonzo River, Gulf Trieste, where this system fed through southern Alps is constrained Karst and Istria cliffs. ...

The effects of anthropogenic disturbance on multiple facets biodiversity are poorly understood. In this study, we worked with the hypothesis that disturbances affect relationship between environmental heterogeneity (EH) and biodiversity. We used a model selection approach to test three predictions. P1: greater level disturbance, weaker will be EH both taxonomic functional alpha diversities. P2:...

A geographic information system ~GIS! based approach is presented for the development of a terrain model based on stream channel representation of the U. S. Army Corps of Engineers Hydrologic Engineering Center’s River Analysis System ~HEC-RAS! hydraulic model. As input, the approach requires a completed HEC-RAS simulation, a digital elevation model ~DEM!, and a GIS representation of the stream...

The western fl ank of the West Mariana Ridge and the distal Parece Vela Basin have been mapped for the fi rst time using a modern multibeam echosounder. The new data reveal the Ridge to be composed of 82 volcanic peaks, of which 25 have summits with water depths of <1000 m and 11 have summits with depths of <500 m deep. Five of the vol canoes have summit craters, and two are guyots ; the remain...

Deposits in dam areas of large reservoirs, which are commonly composed fine-grained sediment, important for reservoir operation. Since the impoundment Three Gorges Reservoir (TGR), sedimentation pattern area has been unexpected. An integrated dynamic model consists both sediment transport with water flow and gravity-driven fluid mud at bottom, was proposed. The incipient motion driven by gravit...

More and more elevation data and methods are available to automatically map hydrographic or thalweg networks. However, there are few methods to assess the network quality. The most used method to compare an extracted network to a reference network gives global quality information on only geographic criterion. The method proposed in this paper allows a network assessment compared to a reference ...

The relative rates of erosion by rivers and glaciers, and the topographic effects of these two different styles of erosion, remain outstanding problems in geomorphology. We use a quantitative description of local fluvial landscapes to estimate how glaciated landscapes might look now had glaciers not developed. This indicates the landscape modification attributable to glacial erosion. We present...

The aim of this study is to investigate the flood management and mitigation measures in ungauged NATURA protected watersheds. examined watersheds are located one most European significant areas (Prespa Natural Park North Greece). SCS-CN model was applied perform hydrological modeling for extreme rainfalls 50, 100 1000 return periods. Extensive field research conducted record all hydrotechnical ...

Morphometric analyzes support an understanding of the physical characteristics hydrographic basins and are commonly used to estimate hydrological variables. This work aims compare geomorphological time concentration (Tc) in two watersheds: upper part Jundiaí river (139.3 km2) Piraí (209 belonging basin, state São Paulo. To calculate Tc, empirical equations monitored data were applied. Applying ...

Gully erosion is one of the most prominent natural denudation processes Mediterranean. It causes significant soil degradation and sediment yield. Most traditional field methods for measurement erosion-induced spatio-temporal changes are time labor consuming, while their accuracy precision highly influenced by various factors. The main research question this study was how approach sampling can b...