Small farm dams: impact on river flows and sustainability in a context of climate change

Habets, Florence; Philippe, Elodie; Martin, E.; David, Cédric H.; Leseur, F.

doi:10.5194/hess-18-4207-2014

Cited by 42 publications

(20 citation statements)

References 34 publications

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“…To date, the relatively few regional studies on small, artificial water bodies (hereafter "ponds") have focussed on water and sediment dynamics rather than GHG emissions (Downing et al, 2008;Callow and Smettem, 2009;Verstraeten and Prosser, 2008;Habets et al, 2014). Studies of GHG emissions from ponds have been limited (Downing, 2010;Deemer et al, 2016) but are in agreement with assessments of larger water bodies where CH 4 is the dominant GHG relative to N 2 O and CO 2 (Merbach et al, 1996;.…”

Section: Introductionmentioning

confidence: 88%

“…These water bodies provide valuable services and are required to irrigate crops, provide water for farm stock, manage storm water, offer visual amenity and recreational activities, and supply water for industrial processes (Fairchild et al, 2013). Small water bodies are often avian biodiversity hotspots, for example hosting an estimated 12 million water birds in a single catchment area in the Murray-Darling river system, Australia (Hamilton et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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The importance of small artificial water bodies as sources of methane emissions in Queensland, Australia

Grinham

Albert

Deering

et al. 2018

Hydrol. Earth Syst. Sci.

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Abstract. Emissions from flooded land represent a direct source of anthropogenic greenhouse gas (GHG) emissions. Methane emissions from large, artificial water bodies have previously been considered, with numerous studies assessing emission rates and relatively simple procedures available to determine their surface area and generate upscaled emissions estimates. In contrast, the role of small artificial water bodies (ponds) is very poorly quantified, and estimation of emissions is constrained both by a lack of data on their spatial extent and a scarcity of direct flux measurements. In this study, we quantified the total surface area of water bodies < 105 m2 across Queensland, Australia, and emission rates from a variety of water body types and size classes. We found that the omission of small ponds from current official land use data has led to an underestimate of total flooded land area by 24 %, of small artificial water body surface area by 57 % and of the total number of artificial water bodies by 1 order of magnitude. All studied ponds were significant hotspots of methane production, dominated by ebullition (bubble) emissions. Two scaling approaches were developed with one based on pond primary use (stock watering, irrigation and urban lakes) and the other using size class. Both approaches indicated that ponds in Queensland alone emit over 1.6 Mt CO2 eq. yr−1, equivalent to 10 % of the state's entire land use, land use change and forestry sector emissions. With limited data from other regions suggesting similarly large numbers of ponds, high emissions per unit area and under-reporting of spatial extent, we conclude that small artificial water bodies may be a globally important missing source of anthropogenic greenhouse gas emissions.

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

The importance of small artificial water bodies as sources of methane emissions in Queensland, Australia

Grinham

Albert

Deering

et al. 2018

Hydrol. Earth Syst. Sci.

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“…In addition, widespread river regulation in temperate regions may limit natural high‐ and low‐flow extremes, with compensation flows released from impoundments maintaining a minimum discharge that reduces intermittence. Agricultural land use can also reduce hydrological variability and cause artificial perennialization; for example, small agricultural dams release water downstream at a steady rate for irrigation …”

Section: Interacting Stressors Compromise Temporary Stream Healthmentioning

confidence: 99%

Temporary streams in temperate zones: recognizing, monitoring and restoring transitional aquatic‐terrestrial ecosystems

et al. 2017

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Temporary streams are defined by periodic flow cessation, and may experience partial or complete loss of surface water. The ecology and hydrology of these transitional aquatic-terrestrial ecosystems have received unprecedented attention in recent years. Research has focussed on the arid, semi-arid, and Mediterranean regions in which temporary systems are the dominant stream type, and those in cooler, wetter temperate regions with an oceanic climate influence are also receiving increasing attention. These oceanic systems take diverse forms, including meandering alluvial plain rivers, 'winterbourne' chalk streams, and peatland gullies. Temporary streams provide ecosystem services and support a diverse biota that includes rare and endemic specialists. We examine this biota and illustrate that temporary stream diversity can be higher than in comparable perennial systems, in particular when differences among sites and times are considered; these diversity patterns can be related to transitions between lotic, lentic, and terrestrial instream conditions. Human impacts on temperate-zone temporary streams are ubiquitous, and result from water-resource and land-use-related stressors, which interact in a changing climate to alter natural flow regimes. These impacts may remain uncharacterized due to inadequate protection of small temporary streams by current legislation, and hydrological and biological monitoring programs therefore require expansion to better represent temporary systems. Novel, temporary-stream-specific biomonitors and multi-metric indices require development, to integrate characterization of ecological quality during lotic, lentic, and terrestrial phases. In addition, projects to restore flow regimes, habitats, and communities may be required to improve the ecological quality of temporary streams.

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“…More sophisticated downscaling methods could not be applied here because the meteorological record was too short. However, previous studies indicated that the main uncertainty in climate change impact studies is associated with the GCM (e.g., Habets et al, 2013). Temperature and precipitation anomalies were extracted from the output of the SCAMPEI project climate models (http://www.cnrm.meteo.fr/ scampei/).…”

Section: -D and 2-d Validation Of Snowmodelmentioning

confidence: 99%

Impact of climate and land cover changes on snow cover in a small Pyrenean catchment

Szczypta

Gascoin

Houet

et al. 2015

Journal of Hydrology

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International audienceThe seasonal snow in the Pyrenees Mountains is an essential source of runoff for hydropower production and crop irrigation in Spain and France. The Pyrenees are expected to undergo strong environmental perturbations over the 21st century because of climate change (rising temperatures) and the abandonment of agro-pastoral areas (reforestation). Both changes are happening at similar timescales and are expected to have an impact on snow cover. The effect of climate change on snow in the Pyrenees is well understood , but the effect of land cover changes is much less documented. Here, we analyze the response of snow cover to a combination of climate and land cover change scenarios in a small Pyrenean catchment (Bassiès, 14.5 km 2 , elevation range 940–2651 m a.s.l.) using a distributed snowpack evolution model. Climate scenarios were constructed from the output of regional climate model projections, whereas land cover scenarios were generated based on past observed changes and an inductive pattern-based model. The model was validated over a snow season using in situ snow depth measurements and high-resolution snow cover maps derived from SPOT (Satellite Pour l'Observation de la Terre – Earth Observation Satellite) satellite images. Model projections indicate that both climate and land cover changes reduce the mean snow depth. However, the impact on the snow cover duration is moderated in reforested areas by the shading effect of trees on the snow surface radiation balance. Most of the significant changes are expected to occur in the transition zone between 1500 m a.s.l. and 2000 m a.s.l. where (i) the projected increase in air temperatures decreases the snow fraction of the precipitation and (ii) the land cover changes are concentrated. However, the consequences on the runoff are limited because most of the meltwater originates from high-elevation areas of the catchment, which are less affected by climate change and reforestation

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Small farm dams: impact on river flows and sustainability in a context of climate change

Cited by 42 publications

References 34 publications

The importance of small artificial water bodies as sources of methane emissions in Queensland, Australia

The importance of small artificial water bodies as sources of methane emissions in Queensland, Australia

Temporary streams in temperate zones: recognizing, monitoring and restoring transitional aquatic‐terrestrial ecosystems

Impact of climate and land cover changes on snow cover in a small Pyrenean catchment

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