Pervasive changes in stream intermittency across the United States

Environmental Research Letters, Год журнала: 2021, Номер 16(8), С. 084033 - 084033

Опубликована: Июль 29, 2021

Abstract Non-perennial streams are widespread, critical to ecosystems and society, the subject of ongoing policy debate. Prior large-scale research on stream intermittency has been based long-term averages, generally using annually aggregated data characterize a highly variable process. As result, it is not well understood if, how, or why hydrology non-perennial changing. Here, we investigate trends drivers three signatures that describe duration, timing, dry-down period across continental United States (CONUS). Half gages exhibited significant trend through time in at least one signatures, changes no-flow duration were most pervasive (41% gages). Changes substantial for many streams, 7% annual exceeding 100 days during study period. Distinct regional patterns change evident, with widespread drying southern CONUS wetting northern CONUS. These correlated aridity, though spatiotemporal variability diverse signatures. While timing strongly related climate, was watershed land use physiography. Our results indicate conditions increasing prevalence over much binary classifications ‘perennial’ ‘non-perennial’ an accurate reflection this change. Water management should reflect changing nature both today future.

Язык: Английский

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Overlooked risks and opportunities in groundwatersheds of the world’s protected areas

Nature Sustainability, Год журнала: 2023, Номер 6(7), С. 855 - 864

Опубликована: Март 30, 2023

Язык: Английский

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Hydrography90m: a new high-resolution global hydrographic dataset

Earth system science data, Год журнала: 2022, Номер 14(10), С. 4525 - 4550

Опубликована: Окт. 17, 2022

Abstract. The geographic distribution of streams and rivers drives a multitude patterns processes in hydrology, geomorphology, geography, ecology. Therefore, hydrographic network that accurately delineates both small large rivers, along with their topographic topological properties, equal precision would be indispensable the earth sciences. Currently, available global hydrographies do not feature headwater great detail. However, these headwaters are vital because they estimated to contribute more than 70 % overall stream length. We aimed fill this gap by using MERIT Hydro digital elevation model at 3 arcsec (∼90 m Equator) derive globally seamless, standardised network, “Hydrography90m”, corresponding information. A central is minimal upstream contributing area, i.e. flow accumulation, 0.05 km2 (or 5 ha) initiate channel, which allowed us extract channels By employing suite GRASS GIS hydrological modules, we calculated range-wide accumulation direction delineate total 1.6 million drainage basins extracted 726 unique segments sub-catchments. In addition, computed variables comprising slope, gradient, length, curvature attributes as well allow for routing various order classifications. validated spatial accuracy Hydrography90m against NHDPlus HR, an independent, national high-resolution dataset United States. Our validation shows newly developed has highest contains compared three other datasets. This comprehensive approach provides long-overdue baseline assessing actual streamflow opens new research avenues studies surface water worldwide. thus offers significant potential facilitate assessment freshwater quantity quality, inundation risk, biodiversity, conservation, resource management objectives manner. layers https://doi.org/10.18728/igb-fred-762.1 (Amatulli et al., 2022a), while can used directly standard applications, recommend seamless integration modules open-source QGIS software further customise data optimal utility from it.

Язык: Английский

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Causes, Responses, and Implications of Anthropogenic versus Natural Flow Intermittence in River Networks

BioScience, Год журнала: 2022, Номер 73(1), С. 9 - 22

Опубликована: Дек. 7, 2022

Abstract Rivers that do not flow year-round are the predominant type of running waters on Earth. Despite a burgeoning literature natural intermittence (NFI), knowledge about hydrological causes and ecological effects human-induced, anthropogenic (AFI) remains limited. NFI AFI could generate contrasting biological responses in rivers because distinct underlying drying evolutionary adaptations their biota. We first review show how different drivers alter timing, frequency duration drying, compared with NFI. Second, we evaluate possible differences biodiversity responses, functions, ecosystem services between AFI. Last, outline gaps management needs related to Because hydrologic characteristics impacts AFI, ignoring distinction undermine intermittent ephemeral streams exacerbate risks ecosystems societies downstream.

Язык: Английский

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Vulnerable Waters are Essential to Watershed Resilience

Ecosystems, Год журнала: 2022, Номер 26(1), С. 1 - 28

Опубликована: Фев. 7, 2022

Watershed resilience is the ability of a watershed to maintain its characteristic system state while concurrently resisting, adapting to, and reorganizing after hydrological (for example, drought, flooding) or biogeochemical excessive nutrient) disturbances. Vulnerable waters include non-floodplain wetlands headwater streams, abundant components representing most distal extent freshwater aquatic network. are hydrologically dynamic biogeochemically reactive systems, storing, processing, releasing water entrained (that is, dissolved particulate) materials along expanding contracting networks. The functions emerging from these processes affect magnitude, frequency, timing, duration, storage, rate change material energy fluxes among downstream waters, thereby maintaining states imparting resilience. We present here conceptual framework for understanding how vulnerable confer demonstrate individual cumulative vulnerable-water modifications reduced extent, altered connectivity) watershed-scale disturbance response recovery, which decreases can trigger transitions across thresholds alternative conducive increased flood frequency nutrient concentrations). subsequently describe resilient watersheds require spatial heterogeneity temporal variability in interactions between terrestrial systems down-gradient necessitates attention conservation restoration their connectivity gradients. To conclude, we provide actionable principles articulate research needs further science management.

Язык: Английский

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Non-perennial segments in river networks

Nature Reviews Earth & Environment, Год журнала: 2023, Номер 4(12), С. 815 - 830

Опубликована: Ноя. 23, 2023

Язык: Английский

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GIS-Based Methods for Identifying River Networks Types and Changing River Basins

Water Resources Management, Год журнала: 2024, Номер 38(13), С. 5323 - 5341

Опубликована: Июнь 17, 2024

Язык: Английский

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Flow intermittence prediction using a hybrid hydrological modelling approach: influence of observed intermittence data on the training of a random forest model

Hydrology and earth system sciences, Год журнала: 2024, Номер 28(4), С. 851 - 871

Опубликована: Фев. 23, 2024

Abstract. Rivers are rich in biodiversity and act as ecological corridors for plant animal species. With climate change increasing anthropogenic water demand, more frequent prolonged periods of drying river systems expected, endangering ecosystems. However, understanding predicting the hydrological mechanisms that control periodic rewetting rivers is challenging due to a lack studies observations, particularly non-perennial rivers. Within framework Horizon 2020 DRYvER (Drying River Networks Climate Change) project, modelling study flow intermittence being carried out three European catchments (Spain, Finland, France) characterised by different climate, geology, use. The objective this represent spatio-temporal dynamics at reach level mesoscale networks (between 120 350 km2). daily spatially distributed condition (flowing or dry) predicted using J2000 model coupled with random forest classification model. Observed data from sources (water measurements, photo traps, citizen science applications) used build predictive This aims evaluate impact observed dataset (sample size, spatial temporal representativity) on performance Results show hybrid approach developed allows patterns be accurately catchments, sensitivity criterion above 0.9 prediction dry events Finnish French case 0.65 Spanish study. shows value combining reduce uncertainty intermittence.

Язык: Английский

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Global patterns in observed hydrologic processes

Nature Water, Год журнала: 2025, Номер unknown

Опубликована: Март 31, 2025

Abstract To manage water resources and forecast river flows, hydrologists seek to understand how moves from precipitation, through watersheds, into channels. However, we lack fundamental information on the spatial distribution physical controls global hydrologic processes. This is needed provide theoretical support for large-domain model simulations. Here, address this issue, present a global, searchable database of 400 research watersheds with published descriptions dominant flow pathways. knowledge synthesis approach leverages decades grant funding, fieldwork effort local expertise. We use test longstanding hypotheses about roles climate, biomes landforms in controlling show that aridity predicts depth pathways terrain predict prevalence lateral These new data search capabilities efficient hypothesis testing investigate emergent patterns relate landscape organization function.

Язык: Английский

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Reconceptualizing the hyporheic zone for nonperennial rivers and streams

Freshwater Science, Год журнала: 2022, Номер 41(2), С. 167 - 182

Опубликована: Март 25, 2022

Nonperennial streams dominate global river networks and are increasing in occurrence across space time. When surface flow ceases or the water dries, moisture can be retained subsurface sediments of hyporheic zone, supporting aquatic communities ecosystem processes. However, hydrological ecological definitions zone have been developed perennial rivers emphasize mixing organisms from both stream groundwater. The adaptation such to include humid dry unsaturated conditions could promote characterization how biogeochemical variability shape within nonperennial zones, advancing our understanding structure function these habitats. To conceptualize zones for streams, we review sources influence physicochemical conditions. We consider extent this biogeochemistry ecology might vary with states. then link components composition communities. Next, examine literature identify priorities research exploring zones. Lastly, by integrating hydrology, biogeochemistry, ecology, recommend a multidisciplinary conceptualization as porous streambed that shift between lotic, lentic, humid, time support aquatic–terrestrial biodiversity. As drying increases because change, call holistic, interdisciplinary terrestrial sciences apply characterize full spectrum

Язык: Английский

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