Global‐scale river network extraction based on high‐resolution topography and constrained by lithology, climate, slope, and observed drainage density

Schneider, Ana Cláudia Reis; Jost, Anne; Coulon, Christian; Silvestre, Marie; Théry, Sylvain; Ducharne, Agnès

doi:10.1002/2016gl071844

Cited by 75 publications

(64 citation statements)

References 42 publications

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“…Data Discuss., https://doi.org /10.5194/essd-2018-87 Surface water bodies and wetlands are often hydrologically connected, and the transition between them is not sharp and varies seasonally. Moreover, these features are difficult to separate based on observations (either in situ or remote), and no dedicated exhaustive dataset is currently available (Raymond et al 2013;Schneider et al, 2017). Inclusion of the shallow surface water bodies (in the RFW map) is compatible with the Ramsar classification, but we depart from this approach with respect to large permanent lakes, which are excluded from all input datasets to RFW and GDW maps (Sect.…”

Section: Wetland Definition and General Mapping Strategymentioning

confidence: 99%

“…Since the underlying principles and input datasets are globally valid, this classification is believed to be highly useful for land surface hydrological modelling. In particular, we intend to use this process in the ORCHIDEE land surface model (Krinner et al, 2005;Ducharne et al, 2017) to describe the areas where GW convergence from the uplands to the lowlands can lead to high soil moisture, with a potential to enhance the local evapotranspiration and related land-atmosphere 20 feedback (e.g., Bierkens and van den Hurk, 2007;Maxwell et al, 2007;Vergnes et al, 2014;Wang et al, 2018).…”

Section: Conclusion and Perspectives 35mentioning

confidence: 99%

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Multi-source global wetland maps combining surface water imagery and groundwater constraints

Tootchi¹,

Jost²,

Ducharne³

2018

Preprint

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Many maps of open water and wetlands have been developed based on three main methods: (i) compiling national/regional wetland surveys; (ii) identifying inundated areas via satellite imagery; and (iii) delineating wetlands as shallow water table areas based on groundwater modelling. However, the resulting global wetland extents vary from 3% to 10 21% of the land surface area because of inconsistencies in wetland definitions and limitations in observation or modelling systems. To reconcile these differences, we propose composite wetland (CW) maps, combining two classes of wetlands: (1) regularly flooded wetlands (RFW) obtained by overlapping selected open-water and inundation datasets; and (2) groundwaterdriven wetlands (GDW) derived from groundwater modelling (either direct or simplified using several variants of the topographic index). Wetlands are statically defined as areas with persistent near-saturated soil surfaces because of regular 15 flooding or shallow groundwater. Seven CW maps were generated at the 15 arc-sec resolution (ca 500 m at the Equator) using geographic information system (GIS) tools and by combining one RFW and different GDW maps. To validate this approach, these CW maps were compared with existing wetland datasets at the global and regional scales. The spatial patterns were decently captured, but the wetland extents were difficult to assess against the dispersion of the validation datasets. Compared with the only regional dataset encompassing both GDWs and RFWs, over France, the CW maps performed well and better 20 than all other considered global wetland datasets. Two CW maps, showing the best overall match with the available evaluation datasets, were eventually selected. These maps provided global wetland extents of 27.5 and 29 million km², i.e., 21.1% and 21.6% of global land area, which are among the highest values in the literature and in line with recent estimates also recognizing the contribution of GDWs. This wetland class covers 15% of the global land area compared with 9.7% for RFW (with an overlap of ca. 3.4%), including wetlands under canopy/cloud cover, leading to high wetland densities in the tropics and small 25 scattered wetlands that cover less than 5% of land but are highly important for hydrological and ecological functioning in temperate to arid areas. By distinguishing the RFWs and GDWs based globally on uniform principles, the proposed dataset might be useful for large-scale land surface modelling (hydrological, ecological and biogeochemical modelling) and environmental planning. The dataset consisting of the two selected CW maps and the contributing GDW and RFW maps is available from PANGAEA at https://doi.pangaea.de/10.1594/PANGAEA.892657 30 Earth Syst. Sci. Data Discuss., https://doi.

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Section: Wetland Definition and General Mapping Strategymentioning

confidence: 99%

Section: Conclusion and Perspectives 35mentioning

confidence: 99%

Multi-source global wetland maps combining surface water imagery and groundwater constraints

Tootchi¹,

Jost²,

Ducharne³

2018

Preprint

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“…The resolution is decreased to 15″, assuming the centre point, to reduce modelling time and to combine with the river network data. The river network data assumed the Strahler methodology in Global-scale river network (GRIN) 31 , which is derived from the SRTM data and has 15″ resolution. The topographic and river Strahler data are then combined with the hydrological data taken from the PCR-GLOBWB 32 global hydrological model, which are derived into annual discharge, seasonal, and inter-annual variations.…”

Section: Methodsmentioning

confidence: 99%

“…Initially, the topographic data are combined with the river Strahler data, which is a numerical measure of its branching complexity and was derived from the same topographic data. The higher the Strahler stream order value the more tributary rivers (branches) deliver water to the given part of the river 31 . The two are compared at the same resolution to identify rivers within the topographic data and to estimate the length of the tunnels connecting the upper reservoir and the lower reservoir in the river.…”

Section: Methodsmentioning

confidence: 99%

Global resource potential of seasonal pumped hydropower storage for energy and water storage

et al. 2020

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Seasonal mismatches between electricity supply and demand is increasing due to expanded use of wind, solar and hydropower resources, which in turn raises the interest on low-cost seasonal energy storage options. Seasonal pumped hydropower storage (SPHS) can provide long-term energy storage at a relatively low-cost and co-benefits in the form of freshwater storage capacity. We present the first estimate of the global assessment of SPHS potential, using a novel plant-siting methodology based on high-resolution topographical and hydrological data. Here we show that SPHS costs vary from 0.007 to 0.2 US$ m −1 of water stored, 1.8 to 50 US$ MWh −1 of energy stored and 370 to 600 US$ kW −1 of installed power generation. This potential is unevenly distributed with mountainous regions demonstrating significantly more potential. The estimated world energy storage capacity below a cost of 50 US$ MWh −1 is 17.3 PWh, approximately 79% of the world electricity consumption in 2017.

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“…Around 30% of the global river network length is intermittent (Pekel, Cottam, Gorelick, & Belward, ; Schneider et al, ), and is also in need of eflows implementation. Intermittency is considered as an extreme flow event in the natural flow regime framework (Poff et al, ), and it is a key determinant of biodiversity and ecosystem function in temporary waterways (Acuña, Hunter, & Ruhí, ; Leigh & Datry, ).…”

Section: Introductionmentioning

confidence: 99%

Accounting for flow intermittency in environmental flows design

Acuña

Jordà-Capdevila

Vezza

et al. 2020

Journal of Applied Ecology

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River ecosystems world‐wide are affected by altered flow regimes, and advanced science and practice of environmental flows have been developed to understand and reduce these impacts. But most environmental flows approaches ignore flow intermittency, which is a natural feature of 30% of the global river network length. Ignoring flow intermittency when setting environmental flows in naturally intermittent rivers might lead to deleterious ecological effects. We review evidence of the ecological effects of flow intermittency and provide guidance to incorporate intermittency (non‐flow events) into existing methods judged as suitable for application in temporary waterways. To better integrate non‐flow events into hydrological methods, we propose a suite of new indicators to be used in the range of variability approach. These indicators reflect dry periods and the unpredictable nature of temporary waterways. We develop a predictability index for protecting those species adapted to temporary conditions. For hydraulic‐habitat models, we find that mesohabitat methods are particularly effective for describing complex habitat dynamics during dry phases. We present an example of the European eel to show the relationship between discharge and non‐flow days and wet area, habitat suitability and connectivity. We find that existing holistic approaches may be applied to temporary waterways without significant structural alteration to their stepwise frameworks, but new component methods are needed to address flow‐related aspects across both flow and non‐flow periods of the flow regime. Synthesis and applications. Setting environmental flow requirements for temporary waterways requires modification and enhancement of existing approaches and methodologies, most notably the explicit consideration of non‐flow events and greater integration of specific geomorphic, hydrogeologic and hydraulic elements. Temporary waterways are among the freshwater ecosystems most vulnerable to alterations in flow regimes, and they are also under great pressure. The methodological modifications recommended in this paper will aid water managers in protecting key components of temporary flow regimes, thereby preserving their unique ecology and associated services.

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Global‐scale river network extraction based on high‐resolution topography and constrained by lithology, climate, slope, and observed drainage density

Cited by 75 publications

References 42 publications

Multi-source global wetland maps combining surface water imagery and groundwater constraints

Multi-source global wetland maps combining surface water imagery and groundwater constraints

Global resource potential of seasonal pumped hydropower storage for energy and water storage

Accounting for flow intermittency in environmental flows design

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