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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Ecosystem services provided by small streams: an overview

Hydrobiologia, Год журнала: 2022, Номер 850(12-13), С. 2501 - 2535

Опубликована: Ноя. 29, 2022

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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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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Optimizing Reservoir Water Management in a Changing Climate

Water Resources Management, Год журнала: 2023, Номер 37(9), С. 3423 - 3437

Опубликована: Апрель 5, 2023

Abstract One of the UN agenda 2030 Sustainable Development goals is associated with water availability and its sustainable management. The present study intends to improve multipurpose reservoir management under climate change scenarios in scarce regions such as Mediterranean. Implemented methods include sequential use model results, hydrological modelling, balance simulation, which are used estimate future availability. This work focuses on developing an innovative approach based rule curves a dynamic assessment needs, reservoirs that dependent transfer system. proposed implemented two located typical Mediterranean river basin assessed long-term up year 2100. results show can ensure 100% urban supply, reliability irrigation supply from 75% 86–91%, provide 92–98% ecological flow. It also demonstrated this beneficial, particularly case watersheds facing scarcity risks, optimize between reliability, volumes, costs.

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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Rethinking ecosystem service indicators for their application to intermittent rivers

Ecological Indicators, Год журнала: 2022, Номер 137, С. 108693 - 108693

Опубликована: Март 5, 2022

In these times of strong pressure on aquatic ecosystems and water resources due to climate change abstraction, intermittent rivers ephemeral streams (IRES) (rivers that periodically cease flow and/or dry) have become valuable assets. Indeed, not only do they supply but also offer services for humanity. Despite a growing recognition towards IRES, information assessing their ecosystem (ES) remains scarce. first step, an international interdisciplinary group researchers developed methodological framework acknowledge ES provided by IRES using 109 indicators. A subset selected indicators was then applied two case studies: the Rio Seco in Algarve (Portugal) Giofyros River Crete (Greece). This paper discusses applicability indicators, including temporal spatial variability regimes. Aspects framework, such as methods time required data collection, nature (demand or supply) functionality each indicator are discussed. The new accounts intermittence analyses can help scientists managers i) increase ease justification use management approaches ii) improve conservation restoration with comprehensive set appropriate IRES. addition, proposed ensures be understood broad audience easily applicable. Since were designed through public participation process, setting has been prepared holistic stakeholder analysis education around functions associated ES. From point view, it would particularly relevant perform economic evaluation this understand value category trade-offs. For scientific community, however, is important consider preferences design socially accepted policies. successfully bridge elements, hereby establishing solid basis assessment

Язык: Английский

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Unveiling the hidden dynamics of intermittent surface water: A remote sensing framework

Remote Sensing of Environment, Год журнала: 2024, Номер 311, С. 114285 - 114285

Опубликована: Июнь 27, 2024

Язык: Английский

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Alternative stable states and hydrological regime shifts in a large intermittent river

Environmental Research Letters, Год журнала: 2022, Номер 17(7), С. 074005 - 074005

Опубликована: Июнь 1, 2022

Abstract Non-perennial rivers and streams make up over half the global river network are becoming more widespread. Transitions from perennial to non-perennial flow a threshold-type change that can lead alternative stable states in aquatic ecosystems, but it is unknown whether streamflow itself either wet (flowing) or dry (no-flow) conditions. Here, we investigated drivers feedbacks associated with regime shifts between conditions an intermittent reach of Arkansas River (USA) past 23 years. Multiple lines evidence suggested these regimes represent states, including (a) significant jumps discharge time series were not accompanied by such as precipitation groundwater pumping; (b) multi-modal state distribution 92% months experiencing no-flow for <10% >90% days, despite unimodal distributions (c) hysteretic relationship climate state. Groundwater levels appear be primary control hydrological regime, alluvial aquifer higher than stream stage during lower streambed regimes. level variation, turn, was driven processes occurring at both regional scale (surface water inflows upstream, pumping) (stream–aquifer exchange, diffuse recharge through soil column). Historical diverse pressures disconnection caused upstream use, increased stability potentially reservoir operations, anomalous In sum, stabilizing among inflows, stream–aquifer interactions, climate, vegetation, pumping create this site. These suggest widespread observed will difficult reverse.

Язык: Английский

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Characterizing Space‐Time Channel Network Dynamics in a Mediterranean Intermittent Catchment of Central Italy Combining Visual Surveys and Cameras

Water Resources Research, Год журнала: 2024, Номер 60(1)

Опубликована: Янв. 1, 2024

Abstract Non‐perennial streams have a global prevalence, but quantitative knowledge of the temporal dynamics their flowing length—namely extent wet portion stream network—remains limited, as monitoring spatiotemporal configuration channels is challenging in most settings. This work combines high spatial resolution visual surveys and camera‐based approaches to reconstruct space‐time network 3.7 km 2 Mediterranean catchment central Italy. Information on hydrological status derived from 40 field sub‐hourly images collected with 21 stage‐cameras are combined exploiting hierarchical principle. The latter postulates existence Bayesian chain, defined local persistence nodes that dictates wetting/drying order during expansion/retraction cycles network. Our results highlight complexity study area: while number decreases dry season increases season, persistency exhibits highly heterogeneous non‐monotonic pattern, originating dynamically disconnected Despite this heterogeneity, model well approximates evolution state nodes, an accuracy exceeds 99%. Crucially, allows reconstruction even cases which part was not observed. provides novel conceptual approach for poorly accessible sites.

Язык: Английский

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