Modeling the sedimentary response of a large Pyrenean basin to global change

Herrero, Albert; Buendía, Cristina; Bussi, Gianbattista; Sabater, Sergi; Vericat, Damià; Palau, Antoni; Batalla, Ramón J.

doi:10.1007/s11368-017-1684-6

Cited by 10 publications

(14 citation statements)

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“…Mean annual temperature ranges from 4 °C at the headwaters to 14 °C in the lowlands. Most of the catchment area (83%) is covered by forests and grassland, 9% is occupied by agriculture (located in lowlands and valley bottoms), while the remaining 8% belong to small villages and rocky outcrops [28,29].…”

Section: The Basinmentioning

confidence: 99%

Effects of Hydropeaking on Bed Mobility: Evidence from a Pyrenean River

Vericat

Ville

Palau-Ibars

et al. 2020

Water

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Hydropower production involves significant impacts on the dynamics and continuity of river systems. In this paper we analyse the effects of hydropeaks on river-bed particle mobility along a 2-km river channel. For this, a total of four study reaches were stablished: one considered a control reach (no impact by hydropeaking) and three impacted (upstream and downstream from the confluence of tributaries). Mobility related to three hydrological scenarios considered representative of the entire flow conditions in the control and impacted reaches was investigated. Results indicate that sediment availability and dynamics proved different in the control reach to those observed downstream in reaches daily affected by hydropeaks. In the absence of large floods capable of resetting the system from a sedimentary point-of-view, only the role of tributaries during small flow events reduces the effects of hydropeaks on river-bed particles’ availability and mobility. The effects of a hydropeaked regime are not observed for the whole spectrum of grain-sizes present in the river-bed. While the structural large elements (i.e., boulders) in the channel do not move, sand and fine gravel stored in patches of the bed are constantly entrained, transported and depleted whereas, in between, medium and large gravel are progressively winnowed. Our results point out that hydropeaked flows, which are generally not considered as disturbances in geomorphic terms, initiate frequent episodes of (selected) bed mobility and, consequently, the river-bed becomes depleted of fine sediments from patches and progressively lacks other fractions such as medium gravels, all of which are highly relevant from the ecological point of view.

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Section: The Basinmentioning

confidence: 99%

Effects of Hydropeaking on Bed Mobility: Evidence from a Pyrenean River

Vericat

Ville

Palau-Ibars

et al. 2020

Water

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“…In the past decade, a handful of studies have been conducted on the response of sediment dynamics to climate change on basins 10 2 -10 3 km 2 in drainage area (e.g., Bussi, Dadson, Prudhomme, & Whitehead, 2016;Herrero et al, 2017;Nunes, Seixas, & Pacheco, 2008). However, to the authors' knowledge, our study is the first to apply a distributed, physically based model to simulate monthly sediment dynamics within a 10 6 -to 10 7 -km 2 river basin under future climate scenarios.…”

Section: Discussionmentioning

confidence: 99%

Modelling the effects of climatic and hydrological regime changes on the sediment dynamics of the Fraser River Basin, British Columbia, Canada

Tsuruta

Hassan

Donner

et al. 2018

Hydrological Processes

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Future sediment dynamics may be affected by changing climates or hydrological regimes because of the close link between hydrology and sediment erosion, deposition, and transport. Previously, investigations of these potential changes have been constrained by a combination of limited observational data, hydrological drivers, and appropriate mechanistic models. Additionally, there is often ambiguity regarding how to disentangle the impacts of climate and hydrology from direct human factors such as reservoirs and land‐use change, which often exert more control over sediment dynamics. In this study, we utilize a recently developed, large‐scale, distributed, mechanistic sediment transport model to project future sediment erosion, deposition, and transportation within the Fraser River Basin in British Columbia, Canada—a basin with historical water flux and sediment load observations and limited anthropogenic influences upstream of its delta. The sediment model is driven by synthetic land‐surface hydrology derived from Scenarios A1B, A2, and B1 of the Special Report on Emissions Scenarios, which were provided by the Pacific Climate Impacts Consortium. Resulting simulations of water flux and sediment load from 1965 to 1994 are first validated against observational data then compared with future projections. Future projections show an overall increase in annual hillslope erosion and in‐channel transportation, a shift towards earlier spring peak erosion and transportation, and longer persistence of the sediment signal through the year. These shifts in timing and annual yield may have deleterious effects on spawning sockeye salmon and are insufficient to counteract future coastal retreat caused by sea‐level rise.

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“…Table 1 shows the sub-catchment characteristics, including sub-catchment areas, reach length and the main cities located along the river system. Land use is a key factor determining water quality and hydrology, as fertilised agricultural crops can deliver excess nutrients into rivers (Whitehead, 1990) and forests will alter hydrological mass balance (Buendia et al, 2016;Herrero et al, 2017). Table 2 shows the land use percentages for the multiple reaches analysed here and Figure 2 shows the mean phosphorus and nitrate-N concentrations for water quality based on monthly mean data from the Mekong River Commission.…”

Section: The Mekong River Catchmentmentioning

confidence: 99%

Water Quality Modelling of the Mekong River Basin: Climate Change and Socioeconomics Drive Flow and Nutrient Flux Changes to the Mekong Delta

Jin¹

2019

Geological Society of America Abstracts With Programs

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The Mekong delta is recognised as one of the world's most vulnerable mega-deltas, being subject to a range of environmental pressures including sea level rise, increasing population, and changes in flows and nutrients from its upland catchment. With changing climate and socioeconomics there is a need to assess how the Mekong catchment will be affected in terms of the delivery of water and nutrients into the delta system. Here we apply the Integrated Catchment model (INCA) to the whole Mekong River Basin to simulate flow and water quality, including nitrate, ammonia, total phosphorus and soluble reactive phosphorus. The impacts of climate change on all these variables have been assessed across 24 river reaches ranging from the Himalayas down to the delta in Vietnam. We used the UK Met Office PRECIS regionally coupled climate model to downscale precipitation and temperature to the Mekong catchment. This was accomplished using the Global Circulation Model GFDL-CM to provide the boundary conditions under two carbon control strategies, namely representative concentration pathways (RCP) 4.5 and a RCP 8.5 scenario. The RCP 4.5 scenario represents the carbon strategy required to meet the Paris Accord, which aims to limit peak global temperatures to below a 2 o C rise while seeking to pursue options that limit temperature rise to 1.5 o C. The RCP 8.5 scenario is associated with a larger 3-4 o C rise. In addition, we also constructed a range of socioeconomic scenarios to investigate the potential impacts of changing population, atmospheric pollution, economic growth and land use change up to the 2050s. Results of INCA simulations indicate increases in mean flows of up to 24%, with flood flows in the monsoon period increasing by up to 27%, but with increasing periods of drought up to 2050. A shift in the timing of the monsoon is also simulated, with a 4 week advance in the onset of monsoon flows on average. Decreases in nitrogen and phosphorus concentrations occur primarily due to flow dilution, but fluxes of these nutrients also increase by 5%, which reflects the changing flow, land use change and population changes.

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Modeling the sedimentary response of a large Pyrenean basin to global change

Cited by 10 publications

References 50 publications

Effects of Hydropeaking on Bed Mobility: Evidence from a Pyrenean River

Effects of Hydropeaking on Bed Mobility: Evidence from a Pyrenean River

Modelling the effects of climatic and hydrological regime changes on the sediment dynamics of the Fraser River Basin, British Columbia, Canada

Water Quality Modelling of the Mekong River Basin: Climate Change and Socioeconomics Drive Flow and Nutrient Flux Changes to the Mekong Delta

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