Source-to-stream connectivity assessment through end-member mixing analysis

Ali, Genevieve; Roy, Alain; Turmel, Marie-Claude; Courchesne, François

doi:10.1016/j.jhydrol.2010.07.049

Cited by 53 publications

(79 citation statements)

References 33 publications

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“…By stating that the relative contribution of geographic sources (i.e. organic versus mineral soil water originating from riparian or upslope areas) to streamflow are strongly correlated to AP 2 and rather weakly correlated to AP 7 , Ali et al (2010b) echo the conclusions of the present study about the appropriateness of AP 2 as a proxy for the Hermine catchment AMCs and the insignificance of AP 7 in that regard. On the contrary to the current paper, Ali et al (2010c) found that AP 10 had an influence on the catchment behaviour only when the cumulative antecedent rainfall amounts lay in the range of 24.5 to 40.5 mm.…”

Section: Discussionsupporting

confidence: 85%

“…The relative contribution of sources (i.e. organic versus mineral soil water originating from riparian or upslope areas) to streamflow were also found to be weakly correlated to AP 2 and rather strongly correlated to AP 7 (Ali et al, 2010b). The occurrence of high magnitude and quick timing rainfall-runoff events was also found to be coincident with 10-day cumulative antecedent precipitation amounts ranging from 24.5 to 40.5 mm (Ali et al, 2010c).…”

Section: Introductionmentioning

confidence: 82%

“…riparian ×× × versus upslope throughfall, organic and mineral soil water) to streamflow Source : Ali et al, 2010b Presence of high magnitude and quick timing rainfall-runoff × events Source : Ali et al, 2010c PET: Mean daily evapotranspiration computed after the temperature-based Hargreaves formula (Hargreaves, 1975) DSP: Number of days since the last rainfall input DSP 10 , DSP 20 , DSP 30 : Number of days since the last rainfall intensity exceeding 10, 20 and 30 mm/d AP 1 , AP 2 , AP 5 , AP 7 , AP 10 , AP 12 , AP 14 : Cumulative precipitation from 1, 2, 5, 7, 10, 12 and 14 days before the survey areas or periods (Ambroise, 2004), and this relates to hydrologic connectivity. Dynamic connectivity of catchment source areas is controlled by the time-changing availability of surface/subsurface storm water, not only in terms of magnitude but also in terms frequency, duration, timing and rate (Bracken and Croke, 2007).…”

Section: Introductionmentioning

confidence: 99%

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A case study on the use of appropriate surrogates for antecedent moisture conditions (AMCs)

Ali¹,

Roy²

2010

Hydrol. Earth Syst. Sci.

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Abstract.While a large number of non-linear hillslope and catchment rainfall-runoff responses have been attributed to the temporal variability in antecedent moisture conditions (AMCs), two problems emerge: (1) the difficulty of measuring AMCs, and (2) the absence of explicit guidelines for the choice of surrogates or proxies for AMCs. This paper aims at determining whether or not multiple surrogates for AMCs should be used in order not to bias our understanding of a system hydrological behaviour. We worked in a small forested catchment, the Hermine, where soil moisture has been measured at 121 different locations at four depths on 16 occasions. Without making any assumption on active processes, we used various linear and nonlinear regression models (i.e. linear, quadratic, cubic, exponential, logarithmic and logistic) to evaluate the point-scale temporal relations between actual soil moisture contents and selected meteorologicalbased surrogates for AMCs. We then mapped the nature of the "best fit" model to identify (1) spatial clusters of soil moisture monitoring sites whose hydrological behaviour was similar, and (2) potential topographic influences on these behaviours. Two conclusions stood out. Firstly, it was shown that the sole reference to AMCs indices traditionally used in catchment hydrology, namely antecedent rainfall amounts summed over periods of seven or ten days, would have led to an incomplete understanding of the Hermine catchment dynamics. Secondly, the relationships between point-scale soil moisture content and surrogates for AMCs were not spatially homogeneous, thus revealing a mosaic of linear and nonlinear catchment "active" and "contributing" sources whose locations were seldom controlled by surface terrain attributes or the topography of a soil-confining layer interface. These Correspondence to: G. A. Ali (genevieve.ali@umontreal.ca) results represent a step forward for the Hermine catchment as they point towards depth-specific processes and spatiallyvariable triggering conditions that are not controlled by topography. Further investigations are, however, necessary in order to derive general guidelines for the choice of the best surrogates for AMCs in a catchment.

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Section: Discussionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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A case study on the use of appropriate surrogates for antecedent moisture conditions (AMCs)

Ali¹,

Roy²

2010

Hydrol. Earth Syst. Sci.

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“…This has been observed elsewhere as well (e.g. Ali et al, 2010;Germer et al, 2007) and can be attributed to seasonal variations in plant growth and dry and wet atmospheric deposition of elements such as Na, K and Mg originating from sea salts or biomass burning. Shallow well SHA-WE.b had trace element concentrations that were much higher than those of the other nine sampled 30 shallow wells SHA-WE.a.…”

Section: Hydrochemistry 25supporting

confidence: 53%

Land use alters dominant water sources and flow paths in tropical montane catchments in East Africa

Jacobs¹,

Timbe²,

Weeser³

et al. 2018

Preprint

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Abstract. Conversion of natural forest to other land uses could lead to significant changes in catchment hydrology, but the nature of these changes has been insufficiently investigated in tropical montane catchments, especially in Africa. To address 20 this knowledge gap, we identified stream water sources and flow paths in three tropical montane sub-catchments (27-36 km²) with different land use (natural forest, smallholder agriculture and commercial tea plantations) within a 1 021 km² catchment in the Mau Forest Complex, Kenya. Weekly samples were collected from stream water, precipitation and soil water for 75 weeks and analysed for stable water isotopes (δ 2 H and δ 18 O) for mean transit time estimation, whereas trace element samples from stream water and potential end members were collected over a period of 55 weeks for end member mixing analysis. 25Stream water mean transit time was similar (~4 years) in the three sub-catchments, and ranged from 3.2-3.3 weeks in forest soils and 4.5-7.9 weeks in pasture soils at 15 cm depth to 10.4-10.8 weeks in pasture soils at 50 cm depth. The contribution of springs and wetlands to stream discharge increased from 18, 1 and 48 % during low flow to 22, 51 and 65 % during high flow in the natural forest, smallholder agriculture and tea plantation sub-catchments, respectively. The dominant stream water source in the tea plantation sub-catchment was spring water (56 %), while precipitation was dominant in the smallholder 30 agriculture (59 %) and natural forest (45 %) sub-catchments. These results confirm that catchment hydrology is strongly influenced by land use, which could have serious consequences for water-related ecosystem services, such as provision of clean water.Hydrol. Earth Syst. Sci. Discuss., https://doi

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“…As has been mentioned, in semi-arid environments there is no base flow in small and medium catchments and floods depend almost exclusively on rainfall (Camarasa and Segura, 2001;Lange et al, 2003;Cudennec et al, 2007). However, the hydrological parameters of events can be highly conditioned by the existence of antecedent rainfall (Yair and Raz-Yassif, 2004;Martina et al, 2006;Ali et al, 2010;Borga et al, 2014).…”

Section: Detailed Analysis Of Events Occurring In the Carraixet Basinmentioning

confidence: 99%

Flash floods in Mediterranean ephemeral streams in Valencia Region (Spain)

Belmonte

2016

Journal of Hydrology

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Source-to-stream connectivity assessment through end-member mixing analysis

Cited by 53 publications

References 33 publications

A case study on the use of appropriate surrogates for antecedent moisture conditions (AMCs)

A case study on the use of appropriate surrogates for antecedent moisture conditions (AMCs)

Land use alters dominant water sources and flow paths in tropical montane catchments in East Africa

Flash floods in Mediterranean ephemeral streams in Valencia Region (Spain)

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