This work presents an analysis of the response to rainfall of ephemeral streams in a karst semi-arid regions of southeast of Italy by an innovative approach. The analysis is based on a 2D simulation model of the behavior of a network of ephemeral
streams. The used approach integrates the hydrological and hydraulic models in order to account first for the dynamic of catchment response to rainfall and activation of the streams, and then for the hydraulic behavior of the streams. Results show the slow
response of ephemeral streams to the rainfall, whereas more extreme rainfall events generate quick and high discharge responses of the ephemeral streams. In addition, modeling results emphasize the non-linearity of runoff generation, in particular for some
Characterizing the north pacific jet stream for understanding historical variability in western United States winter precipitation
The AA. examined historical winter-season relationships among precipitation across the western United States, the northern Pacific jet stream (NPJ) across the northern Pacific Ocean basin, and the El Niño-Southern Oscillation (ENSO) phenomenon
jet stream characteristics as independent variables, along with climate teleconnections, when considering seasonal precipitation variability in regions where large-scale jet stream dynamics are influential.
groundwater flow recharges stable stream flow in the sandstone area. Manual field measurements from sections of first-order streams and results of high-resolution analysis of long profiles using terrestrial laser scanning are discussed. The contrast in runoff
processes, as well as grain-size distributions of weathering products between the 2 areas, influences dissimilar bed-load transport regimes and promotes spatial variations in channel profiles between headwater streams. These contrasting hydro-geomorphic
processes affect channel-step morphology, indicating that lithology plays a key role in the formation of channel steps and in variations between headwater streams.
Geomorphic effects of mosses in a low-order stream in Fairfax County, Virginia
Bank erosion ; Biogeomorphology ; Channel geometry ; Impact ; Moss ; Riparian vegetation ; Stream ; United States of America ; Vegetation ; Virginia
surveys were conducted to record stream bank erosion and changes in moss patches over time. A variety of techniques, including repeat photography, erosion pins, visual observations, and measurements of channel morphology, were used in field surveys
revealed that mosses have a potential role in stabilizing stream banks.
Channel geometry ; Czech Republic ; Discharge ; Gravel ; Moravian-Silesian Beskids mountain ; River bed ; Sediment load ; Sediment transport ; Stream
This paper summarizes the results of bedload transport research in the Morávka, Mohelnice and Ostravice basins, conducted using the BAGS (Bedload Assessment for Gravel-bed Streams) spreadsheet-based program and unit stream power empirical formulas
Spatial patterns of March and September streamflow trends in Pacific Northwest streams, 1958-2008
Climatic change ; Climatic warming ; Idaho ; Meltwater ; Model ; Oregon ; Precipitation ; Seasonal variation ; Spatial analysis ; Stream ; Stream flow ; United States of America ; Washington State ; Water ; Water resources
This study detects significant negative trends in September absolute streamflow in a majority of 68 stream-gauging stations located on unregulated streams in the pacific Northwest (PNW) from 1958 to 2008. The geographically weighted regression (GWR
Carpathian Mountains ; Carrying capacity ; Central Europe ; Discharge ; Europe ; Flow resistance ; Headwater ; Hydrology ; River bed ; Runoff ; Sediment transport ; Stream
and power-law relationships) and critical conditions of the incipient motion of a bed particle (critical shear stress, stream power, flow velocity and discharge) are closely discussed in order to describe hydraulic and bedload transport conditions in steep
headwater streams. In the second part of the paper the authors present two pilot studies from the Western Carpathians and test potential applicability of specific formulas in this region. Results of the formulas point to relatively nonselective character
of bedload transport during high magnitude floods in Beskydian headwater streams. - (EN)
The AA. apply both spectral analysis and autoregressive integrated moving average (ARIMA) modeling, a parsimonious stochastic approach to 11 alluvial mountain step-pool streams for identifying their periodicities. They interpolate the original
Historical variability and feedbacks among land cover, stream power, and channel geometry along the lower Canadian River floodplain in Oklahoma
Agricultural land use ; Biogeomorphology ; Channel geometry ; Climatic variability ; Dam ; Discharge ; Floodplain ; Human impact ; Hydro-electric station ; Nineteenth Century ; Oklahoma ; Riparian vegetation ; River regime ; Stream ; Twentieth
In this study, the AA. use a variety of data sources to assess the historical changes along the lower Canadian River floodplain and identify feedbacks among floodplain cultivation (by 1898), dam construction (1964), specific stream power
This paper reports a radiofrequency identification (RFID) tracing experiment implemented in a high-sediment-load mountain stream typical of alpine gravel-bed torrents : the Bouinenc Torrent, a tributary to the Bléone River in southeast France
Bedload transport measurements at the Erlenbach stream with geophones and automated basket samplers
Alps (The) ; Mountain ; Quantitative analysis ; Research technique ; Sediment load ; Sediment transport ; Stream ; Switzerland
In the Erlenbach stream, sediment transport has been continuously monitored with piezoelectric bedload impact and geophone sensors since 1986. In 2008-2009, the measuring system was enhanced by installing an automatic system to obtain bedload
Climatic change ; Correlation ; Danube ; Fluvial hydrology ; Hungary ; Stream ; Time series ; Water temperature ; Watershed
with a strong continental character. Changes were followed along the Hungarian stream sections. Trends in water temperature change were established and interpretations were sought with consideration to the climate change trends predicted by climatologists
from headwaters, hillslopes and tributary streams. Additionally, soil development and radiocarbon ages, together with local and regional paleoclimate reconstructions, were used to infer the range of processes acting in this system. The AA. discuss
the potential for increases in sediment supply during periods of (1) para-glacial adjustment, (2) climatic cooling, (3) increased frequency of climate change and (4) increased fire frequency or severity. They also consider the effects of changes in stream
discharge and extreme storm occurrence. They conclude that combinations of these processes, operating at different times, have contributed to sediment mobilization since de-glaciation. Stream and landform morphology also varies longitudinally due
The role of vegetation in mitigating the effects of landscape clearing upon dryland stream response trajectory and restoration potential
and the potential for management. It focuses on cleared and uncleared sites in the Yerritup catchment, along the south coast of Western Australia, that occur along a transect with a consistent stream gradient and landscape topographic setting. The trajectory
Alluvial cone ; Alps (The) ; British Columbia ; Canada ; Channel geometry ; Dendrogeomorphology ; Ecosystem ; Europe ; Forest production management ; Impact ; Mountain ; Riparian vegetation ; Sediment transport ; Spain ; Stream ; Stream flow
and more recent work on the dependencies and interactions between hydrogeomorphic processes and vegetation. In particular, the AA. address the role of vegetation in the initiation of hydrogeomorphic processes and its impact on stream morphology as well
Braided channel ; Channel ; Channel geometry ; Classification ; Fluvial geomorphology ; Fluvial hydrology ; Human impact ; Hydraulic works ; Natural hazards ; River bed ; Sediment transport ; Stream ; Stream flow ; Valley ; World
metamorphosis and produces anthropogenic channel types. New approaches to channel systemization involve hydrological parameters and sediment transport as well as stream power. The typology of channel reaches has several practical implications, including
of early diagenesis (i.e. eogenetic stage). Based on speleological analysis the eogenetic caves were grouped into four types; (1) linear stream caves, (2) shelter caves, (3) breakdown caves, and (4) vadose shafts. - (IKR)
, whereas the active streams are now deepened along secondary joints. Morphological analysis allows inference of a hypothesis concerning the speleogenetic evolution of the cave and its relationship with an upper perched aquifer hosted in the Cretaceous
In the Caldera coastal district of Northern Chile, the marine terraces of Quaternary age are characterized by steep cliffs dissected by deep gullies, from which torrential streams are formed. The gullies are controlled by the scarps of the terraces
. Climate conditions, such as the presence of Ocean waters upwelling and El Niño, cause sporadic rainfall events. Hence, the micro-watersheds and streams become active and function as torrential channels producing debris flows. Moreover, torrential systems