A multi-scale approach of runoff generation in a Sahelian gully catchment: a case study in Niger

Estèves, Michel; Lapetite, Jean‐Marc

doi:10.1016/s0341-8162(02)00136-4

Cited by 63 publications

(47 citation statements)

References 22 publications

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“…This study is contradictory to the traditional studies mentioned above. The increasing runoff coefficients could result from the encrusted soil surface (Peugeot and others 1997;Vandervaere and others 1997;Esteves and Lapetite 2003) as well as the increasing soil moisture contents downslope, however, the decreasing ones could relate to other factors to be discussed in the next sections.…”

Section: Effect Of Slope Lengthmentioning

confidence: 96%

“…Table 4 shows that all the rainfall eigenvalues were significantly correlated with runoff coefficient at the 0.01 level, among which I 30 was the most positively correlated one (r = 0.684), implying its determinant role in influencing runoff generation. Higher rainfall intensity made crusting form easier, and more runoff was generated (Vandervaere and others 1997;Esteves and Lapetite 2003). However, when the flow energy was large enough, the encrusted soil layer was destroyed and rills and/or even ephemeral gully developed, which decreased runoff coefficient.…”

Section: Effect Of Soil Moisture Contentmentioning

confidence: 99%

“…(Wei and others 2007), among which slope, including its length and gradient, is an important issue causing this scale effect. A clear reduction was found in runoff per unit slope length as slope length was increased, and this effect became more pronounced with decreasing storm duration (Stomph and others 2002;van de Giesen and others 2000;van de Giesen and others 2005;Esteves and Lapetite 2003;Joel and others 2002). For most rainfall events, the time and volume of rainfall per unit area required before runoff started were larger in large plots than in small plots (Joel and others 2002).…”

Section: Introductionmentioning

confidence: 98%

“…Therefore, the rainfall characteristic is another unneglected variable causing scale effect of runoff (van de Giesen and others 2005;Wei and others 2007). Studies found that higher rainfall intensity can reduce the spatial variability (Hawkins 1982;Dunne and others 1991;Esteves and Lapetite 2003). Van de Giesen and others (2005) pointed out that short and intensive rainstorms, coupled with high infiltration rates, give the most significant scale effect.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Rainfall Regime and Slope on Runoff in a Gullied Loess Region on the Loess Plateau in China

Fang

Qiangguo

Chen

et al. 2008

Environmental Management

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Runoff was measured from seven plots with different slopes nested in Tuanshangou catchment on the Loess Plateau to study effect of slopes on runoff in relation to rainfall regimes. Based on nine years of field observation and K-mean clusters, 84 rainfall events were grouped into three rainfall regimes. Rainfall regime A is the group of events with strong rainfall intensity, high frequency, and short duration. Rainfall regime C consists of events with low intensity, long duration, and infrequent occurrence. Rainfall regime B is the aggregation of events of medium intensity and medium duration, and less frequent occurrence. The following results were found: (1) Different from traditional studies, runoff coefficient neither decreased nor increased, but presented peak value on the slope surfaces; (2) For individual plot, runoff coefficients induced by rainfall regime A were the highest, and those induced by rainfall regime C were the lowest; Downslope, the runoff coefficients induced by three rainfall regimes presented the same changing trend, although the peak value induced by regime A occurred on a shorter slope length compared to those by regime B and C; (3) Scale effect on runoff induced by rainfall regime A was the least, and that induced by rainfall regime C was the largest. These results can be explained by the interactions of crusting, soil moisture content, slope length and gradient, and erosion units, etc., in the context of different rainfall regimes.

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Section: Effect Of Slope Lengthmentioning

confidence: 96%

Section: Effect Of Soil Moisture Contentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Rainfall Regime and Slope on Runoff in a Gullied Loess Region on the Loess Plateau in China

Fang

Qiangguo

Chen

et al. 2008

Environmental Management

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show abstract

“…The infiltration capacity of a crusted soil is very low and depends on the type of crust [Casenave and Valentin, 1992;Le Bissonnais et al, 2005]. Crusted soils may develop natural cracks or microsteps where water can easily infiltrate [Esteves and Lapetite, 2003]. In certain semiarid areas of West Africa, vegetation patterns consisting of alternating areas of vegetation and bare soil covered by crusts are frequently observed.…”

Section: Introductionmentioning

confidence: 99%

1-D steady state runoff production in light of queuing theory: Heterogeneity, connectivity, and scale

Harel

Mouche

2013

Water Resour. Res.

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[1] We used the frameworks of queuing theory and connectivity to study the runoff generated under constant rainfall on a one-dimensional slope with randomly distributed infiltrability. The equivalence between the stationary runoff-runon equation and the customers waiting time in a single server queue provides a theoretical link between the statistical description of infiltrability and that of runoff flow rate. Five distributions of infiltrability, representing soil heterogeneities at different scales, are considered: four uncorrelated (exponential, bimodal, lognormal, uniform) and one autocorrelated (lognormal, with or without a nugget). The existing theoretical results are adapted to the hydrological framework for the exponential case, and new theoretical developments are proposed for the bimodal law. Numerical simulations validate these results and improve our understanding of runoff-runon for all of the distributions. The quantities describing runoff generation (runoff one-point statistics) and its organization into patterns (patterns statistics and connectivity) are studied as functions of rainfall rate. The variables describing the wet areas are also compared to those describing the rainfall excess areas, i.e., the areas where rainfall exceeds infiltrability. Preliminary results concerning the structural and functional connectivity functions are provided, as well as a discussion about the origin of scale effects in such a system. We suggest that the upslope no-flow boundary condition may be responsible for the dependence of the runoff coefficient on the scale of observation. Queuing theory appears to be a promising framework for runoff-runon modeling and hydrological connectivity problems.Citation: Harel, M.-A., and E. Mouche (2013), 1-D steady state runoff production in light of queuing theory: Heterogeneity, connectivity, and scale, Water Resour. Res., 49,[7973][7974][7975][7976][7977][7978][7979][7980][7981][7982][7983][7984][7985][7986][7987][7988][7989][7990][7991]

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Annual water, sediment, nutrient, and organic carbon fluxes in river basins: A global meta‐analysis as a function of scale

Mutema

Chaplot

Jewitt

et al. 2015

Water Resources Research

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A multi-scale approach of runoff generation in a Sahelian gully catchment: a case study in Niger

Cited by 63 publications

References 22 publications

Effect of Rainfall Regime and Slope on Runoff in a Gullied Loess Region on the Loess Plateau in China

Effect of Rainfall Regime and Slope on Runoff in a Gullied Loess Region on the Loess Plateau in China

1-D steady state runoff production in light of queuing theory: Heterogeneity, connectivity, and scale

Annual water, sediment, nutrient, and organic carbon fluxes in river basins: A global meta‐analysis as a function of scale

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