River patterns and their meaning

Twidale, C. R.

doi:10.1016/j.earscirev.2004.03.001

Cited by 229 publications

(170 citation statements)

References 141 publications

Supporting

Mentioning

125

Contrasting

Unclassified

Order By: Relevance

“…Bohemian Stream ( Figure 1B) is a typical subsequent stream whose course is determined by selective headwater erosion of weak sedimentary strata (Johnson, 1932;Twidale, 2004) and flows NE transverse to the SE general dip of the Whisky Bay Formation bedding surfaces . Algal Stream ( Figure 1C) has a subsequent upper part of its catchment, which is parallel to the Bohemian Stream valley axis.…”

Section: Study Areamentioning

confidence: 99%

Seasonal hydrological and suspended sediment transport dynamics in proglacial streams, James Ross Island, Antarctica

Kavan

Ondruch

Nývlt

et al. 2016

Geografiska Annaler: Series A, Physical Geography

View full text Add to dashboard Cite

Rapid warming of the Antarctic Peninsula is producing accelerated glacier mass loss and can be expected to have significant impacts on meltwater runoff regimes and proglacial fluvial activity. This study presents analysis of the hydrology and suspended sediment dynamics of two proglacial streams on James Ross Island, Antarctic Peninsula. Mean water discharge during 8/1/2015 to 18/2/2015 reached 0.19 m 3 s -1 and 0.06 m 3 s -1 for Bohemian Stream and Algal Stream, respectively, equivalent to specific runoff of 76 mm month -1 and 60 mm month -1 . The daily discharge regime strongly correlated with air and ground temperatures. The effect of global radiation on proglacial water discharge was found low to negligible. Suspended sediment concentrations of Bohemian Stream were very high (up to 2927 mg L -1 ) due to aeolian supply and due to the high erodibility of local rocks. Total sediment yield (186 t km -2 yr -1 ) was high for (nearly) deglaciated catchments, but relatively low in comparison with streams draining more glaciated alpine and arctic catchments. The sediment provenance was mostly local Cretaceous marine and aeolian sediments; volcanic rocks are not an important source for suspended load. High Rb/Sr ratios for some samples suggested chemical weathering. Overall, this monitoring of proglacial hydrological and suspended sediment dynamics contributes to the dearth of such data from Antarctic environments and offers an insight to the nature of the proglacial fluvial activity, which is likely to be in a transient state with ongoing climate change.

show abstract

Section: Study Areamentioning

confidence: 99%

Seasonal hydrological and suspended sediment transport dynamics in proglacial streams, James Ross Island, Antarctica

Kavan

Ondruch

Nývlt

et al. 2016

Geografiska Annaler: Series A, Physical Geography

View full text Add to dashboard Cite

show abstract

“…Basins consist of river channels, hill slopes, crests of interfluves and drainage divides that define the shape of the catchment. Some of these elements will respond more rapidly to changes imposed on them than others, according to the combination of many factors such as lithology, local tectonics, rock uplift/subsidence and climate changes (Morisawa and Hack, 1985;Kühni and Pfiffner, 2001;Twidale, 2004). In tectonically active landscapes, changes in the incision/aggradation behaviour of the rivers are associated with the variations in climate and tectonics (Schumm, 1969;Bull, 1991;Merrits et al, 1994;Ascione and Cinque, 1999;Burbank and Pinter, 1999;Pazzaglia and Brandon, 2001;D'Agostino et al, 2001;Pazzaglia, in press).…”

Section: Introductionmentioning

confidence: 99%

Two Tectonic Geomorphology Studies on the Landscape and Drainage Network of Chain and Piedmont Areas of the Abruzzi Region (Central Apennines, Italy)

Miccadei¹,

Piacentini²

2011

New Frontiers in Tectonic Research - At the Midst of Plate Convergence

View full text Add to dashboard Cite

“…Su régimen climático obedece a un patrón bimodal con dos periodos de lluvias que alcanzan su pico máximo en abril y septiembre y una temperatura promedio anual de 26 °C. Entre estos dos municipios se advierte una red de drenaje de tipo paralelo (Twidale, 2004) compuesta por un sinnúmero de pequeñas corrientes o caños que drenan desde la vertiente de la Cordillera Oriental hacia el sureste en dirección del río Guatiquia, una de las corrientes componentes del sistema hídrico de la cuenca del río Meta (Fig. 1).…”

Section: Materialses Y Métodos áRea De Estudiounclassified

Evolución De La Integridad Estructural De Ecosistemas Lóticos Del Piedemonte Llanero Frente a La Intervención Antrópica

Vanegas¹

2014

Acta biol. Colomb.

View full text Add to dashboard Cite

RESUMENEntre los años 1993 y 2007 se determinó la evolución de la integridad ecológica de dos corrientes del piedemonte llanero del Meta, los caños Mateguadua y Caibe en proximidades a los municipios de Restrepo y Cumaral. Los parámetros analizados fueron la evolución del paisaje, el comportamiento de las variables fisicoquímicas, la calidad y oferta de hábitats acuáticos y la organización estructural de las comunidades ícticas. El paisaje experimentó un deterioro severo durante el periodo analizado de muestreo por causa de la deforestación del bosque de galería en ambas corrientes. El lavado y la erosión de los suelos aportaron una carga considerable de sólidos a las corrientes, produjeron sedimentación en el lecho de ambos caños, alteraron los patrones de profundidad y redujeron drásticamente la heterogeneidad espacial de los hábitats acuáticos. La estructura de la comunidad íctica experimentó alteraciones en respuesta al deterioro ambiental, como por ejemplo el progresivo reemplazamiento de especies insectívoras por especies algívoras y fitófagas y la dominancia de poblaciones de Hemigrammus barrigonae, especie que prosperó gracias al avance paulatino de colonias de microalgas y macrófitas en al agua por causa de la fragmentación del bosque de galería.Palabras clave: bosque de galería, deforestación, fragmentación, caños. ABSTRACTFrom 1993 to 2007, was analyzed the evolution of the ecological integrity of two streams in the "piedmont" of Meta, the "caños" Mateguadua and Caibe near to Cumaral and Restrepo districts. The parameters analyzed were landscape evolution, physicochemical variables trends, quality and supply of aquatic habitats and the structural organization of fish communities. Landscape quality declined during the sampling period due to deforestation of gallery forests in both streams. Soil erosion process threw considerable amount of solids particles to streams, causing siltation in the bed of both streams. In fact, this condition affected depth patterns and spatial heterogeneity of aquatic habitats. Fish community structure showed changes in response to environmental degradation, such as the progressive replacement of insectivorous species by phytophagous and algivorous species and the dominance of populations of Hemigrammus barrigonae, a species that prospered on gradual progress of colonies of microalgae and macrophytes in the water due to the riparian forest fragmentation.

show abstract

River patterns and their meaning

Cited by 229 publications

References 141 publications

Seasonal hydrological and suspended sediment transport dynamics in proglacial streams, James Ross Island, Antarctica

Seasonal hydrological and suspended sediment transport dynamics in proglacial streams, James Ross Island, Antarctica

Two Tectonic Geomorphology Studies on the Landscape and Drainage Network of Chain and Piedmont Areas of the Abruzzi Region (Central Apennines, Italy)

Evolución De La Integridad Estructural De Ecosistemas Lóticos Del Piedemonte Llanero Frente a La Intervención Antrópica

Contact Info

Product

Resources

About