Spatial scale dependence of sediment dynamics in a semi-arid badland drainage basin

Boer, D. de; Campbell, Ian H.

doi:10.1016/0341-8162(89)90014-3

Cited by 51 publications

(26 citation statements)

References 11 publications

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“…The basins were nested, so that each mesoscale basin contained one sub-basin which, in turn, contained a number of microscale basins. The terms microscale, sub-basin scale and mesoscale follow usage by De Boer & Campbell (1989), and are utilized for brevity and clarity of reference. Their application in this paper is therefore strictly limited to the ranges of basin area indicated herein.…”

Section: Field Study Designmentioning

confidence: 99%

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Constraints on spatial transference of rainfall-runoff relationships in semiarid basins drained by ephemeral streams

Boer

1992

Hydrological Sciences Journal

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Field data on drainage basin response have a characteristic scale which is determined by the size of the basin investigated. As a rule, information obtained at one particular scale can be extrapolated over a limited scale range only. This study identifies the nature of constraints on spatial scale transference in a series of semiarid badland drainage basins ranging in area from < 1 to 202 260 m 2 . Research focussed on the rainfall-runoff relationship during a single rainstorm so that the temporal scale was kept constant. Spatial scale transference between systems of differing scale was restricted by morphological and functional constraints. Morphological constraints are caused by morphological elements present in large scale systems but absent in small scale ones. Functional constraints arise solely from the characteristics of the matter and energy flows in the systems of interest. Limits imposed upon spatial scale transferences by morphological and functional constraints are fuzzy rather than sharp in character.

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Section: Field Study Designmentioning

confidence: 99%

“…Details of the instrumentation of the mesoscale Rimco and New Basins and maps showing the locations of instruments were presented by De Boer & Campbell (1989, 1990.…”

Section: Instrumentation and Experimental Proceduresmentioning

confidence: 99%

Constraints on spatial transference of rainfall-runoff relationships in semiarid basins drained by ephemeral streams

Boer

1992

Hydrological Sciences Journal

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“…Recent publications have identified sediment sources by systematically analysing single event hysteretic loops of sediment transport (diCenzo & Luk, 1997, Lenzi & Marchi, 2000, Jansson, 2002 or identifying different runoff processes by describing hysteresis in temperature and specific conductance (Kobayashi et al, 1999). Hysteresis is also controlled by catchment size, rainfall amount and soil moisture (Klein, 1984, DeBoer & Campbell, 1989.…”

Section: Introductionmentioning

confidence: 99%

Catchment soil moisture and rainfall characteristics as determinant factors for discharge/suspended sediment hysteretic loops in a small headwater catchment in the Spanish pyrenees

Seeger

Errea

Beguerı́a

et al. 2004

Journal of Hydrology

296

212

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Abstract:The concentration of suspended sediment and discharge generated during flood events are not normally homogenous, and the curve representing sediment concentration vs. discharge through time is often a hysteretic loop. Three types of hysteretic loops were found at Arnás, a Mediterranean headwater catchment in the Central Spanish Pyrenees: clockwise (the most frequent), counter-clockwise and eightshaped. They are associated with different levels of humidity and rainfall and therefore indicators of different processes of runoff and sediment transport. Clockwise loops are generated under "normal" stormflow conditions, when the catchment is very moist and runoff generation and sediment supply is limited to areas next to the channel (i.e., sediments are removed, transported and depleted rapidly). Counter-clockwise curves occur under very high moisture and high antecedent rainfall conditions. In this case, flood propagation occurs as a kinematic wave. Sediment sources are incorporated all over the catchment. In both cases, saturation excess overland flow generates the superficial runoff. The eight-shaped loop (partial clockwise followed by counterclockwise) occurs with low water content. Here, the runoff generation process is supposed to be infiltration excess overland flow, which causes a rapid extension of the contributing areas both near the channel and over the whole catchment.

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“…Elle peut être attribuable à la microtopographie et à la présence d'obstacles sur la surface qui créent une divergence locale de l'écoulement ou encore, à des variations du degré de saturation du sol et de la capacité d'infiltation. En augmentant la distance entre deux points de mesure (versant plus long), l'hétérogénéité et la complexité du milieu ont plus de chance de se manifester (DE BOER et CAMPBELL, 1989). Dans ces circonstances, la réponse hydrologique du champ à différentes échelles peut être très variable.…”

Section: Discussion Et Conclusionunclassified

“…Par contre, les combinaisons facto ri elles qui caractérisent un champ à une période donnée de l'année sont prévisibles. L'aspect méthodologique de cette recherche s'inscrit donc dans la veine des récents travaux en hydrologie, qui visent à mieux comprendre les actions complexes d'un processus qui agit à différentes échelles dans la nature (DE BOER et CAMPBELL, 1989 ;SUTHERLAND et BRYAN, 1989).…”

Section: Les Capteursunclassified

Hydrogrammes de ruissellement superficiel et transport des sédiments en milieu agricole

Mathier¹,

Roy²

2005

rseau

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Nous présentons ici une méthode simple qui permet de mesurer simultanément l'eau et les sédiments en transit à la surface du sol en milieu agricole. Des hydrogrammes de ruissellement superficiel sont comparés pour évaluer la variabilité saisonnière et spatiale du ruissellement et de l'érosion lors de trois précipitations naturelles (1,16, 1,76, 1,78 mm h-1). Les mesures ponctuelles sur le terrain sont utilisées pour caler une équation de transport des sédiments compatible avec les modèles hydrologiques distribués. Le débit solide (Qs) est exprimé par: Qs = k Qm lp où Q est le débit liquide et l l'intensité des précipitations. Les hydrogrammes montrent que les débits varient dans l'espace selon la distance entre deux points d'échantillonnage et, dans le temps selon l'état de la surface. Pendant la saison, la concentration moyenne des sédiments dans l'eau et le taux de transport demeurent constants. Le transport par le ruissellement sur la parcelle est faible et semble limité par la capacité du processus à maintenir les sédiments en mouvement. Ce comportement affecte le paramètre m associé au débit liquide dans l'équation de transport, qui est en dessous des valeurs théoriques proposées dans la littérature. Le transport de sédiments est également fonction de l, qui par le biais de l'impact des gouttes de pluie sur la surface détache et facilite le transport des particules.

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Spatial scale dependence of sediment dynamics in a semi-arid badland drainage basin

Cited by 51 publications

References 11 publications

Constraints on spatial transference of rainfall-runoff relationships in semiarid basins drained by ephemeral streams

Constraints on spatial transference of rainfall-runoff relationships in semiarid basins drained by ephemeral streams

Catchment soil moisture and rainfall characteristics as determinant factors for discharge/suspended sediment hysteretic loops in a small headwater catchment in the Spanish pyrenees

Hydrogrammes de ruissellement superficiel et transport des sédiments en milieu agricole

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