Assessing the Influence of Zero‐Flow Threshold Choice for Characterising Intermittent Stream Hydrology

Hydrological Processes, Journal Year: 2024, Volume and Issue: 38(10)

Published: Oct. 1, 2024

ABSTRACT Zero‐flow recordings in gauged streamflow data are critically important for intermittent stream research. Acknowledging the high uncertainty zero‐flow recordings, many studies pick a small number as threshold, below which flow is considered to be zero. The choice of threshold often arbitrary or unjustified, leads us wonder: would selecting slightly different change analysis result significantly? Here, we used simple sensitivity assess how impacts calculated values relevant metrics Results show that these tended more sensitive lower thresholds, suggesting even choosing could lead meaningfully results from management perspective. This study highlights need reasonable justification and concludes with potential ways reduce measurement.

Language: Английский

---

Spatio‐Temporal Variability of Hyporheic Exchange Processes Across a Stream Network

Hydrological Processes, Journal Year: 2024, Volume and Issue: 38(12)

Published: Dec. 1, 2024

ABSTRACT Hyporheic exchange processes (HEP) play a critical role in controlling riverine biogeochemical turnover and ecological functioning. Despite the expected scaling of HEP across stream networks, only limited knowledge exists about how changes over hydrological year network. This study investigates spatial temporal second‐ to fourth‐order network southern Germany. We employed radon, an environmental tracer commonly used for quantifying HEP, relationships between discharge. Numerical mass‐balance modelling was applied quantify we specifically focused on hyporheic area ( A s ) stream's cross‐sectional ). Our findings showed decrease /A with increasing order, indicating The absence correlation discharge implies that may be influenced by combination local heterogeneities geomorphology. Temporal variability observed year, highest headwater streams. Lower values were noted headwaters during summer compared other seasons coincided increased groundwater contribution streamflow decreased Although neither or identified as driving factors reduced summer, our suggest lead have further downstream is evidenced larger / ratios higher‐order streams seasons. These highlight necessity comprehensive investigations whole

Language: Английский

---

Identifying invertebrate indicators for streamflow duration assessments in forested headwater streams

Freshwater Science, Journal Year: 2023, Volume and Issue: 42(3), P. 247 - 267

Published: June 5, 2023

Streamflow-duration assessment methods (SDAMs) are rapid, indicator-based tools for classifying streamflow duration (e.g., intermittent vs perennial flow) at the reach scale. Indicators easily assessed stream properties used as surrogates of flow duration, which is too resource intensive to measure directly many reaches. Invertebrates commonly SDAM indicators because not highly mobile, and different species have life stages that require durations times year. The objectives this study were 1) identify invertebrate taxa can be distinguish between reaches having flow, 2) compare indicator strength across taxonomic numeric resolutions, 3) assess relative importance season habitat type on ability invertebrates predict streamflow-duration class. We 2 methods, random forest models analysis, analyze aquatic terrestrial data (presence/absence, density, biomass) family genus levels from 370 samples collected both erosional depositional habitats during wet dry seasons. In total, 36 53 sampled along 31 forested headwater streams in 4 level II ecoregions United States. Random family- genus-level datasets had classification accuracy ranging 88.9 93.2%, with slightly higher density than presence/absence biomass datasets. Season (wet/dry) tended a stronger predictor class (erosional/depositional). Many (58.8%) (61.6%) reaches, most exclusive 1 rarely collected. However, 23 family-level or (20 3 terrestrial) 44 genera identified potential streams. utility varied part representation dataset but also variable ecological responses drying among species. Aquatic been an important field existing SDAMs, our findings highlight how including further maximize classifications.

Language: Английский

---

Allometric scaling of hyporheic respiration across basins in the Pacific Northwest USA

Authorea (Authorea), Journal Year: 2024, Volume and Issue: unknown

Published: March 27, 2024

Hyporheic zones regulate biogeochemical processes in streams and rivers, but high spatiotemporal heterogeneity makes it difficult to predict how these scale from individual reaches river basins.Recent work applying allometric scaling (i.e., power-law relationships between size function) networks provides a new paradigm develop scalable understanding of hyporheic processes.We used reach-scale aerobic respiration estimates explore patterns across two basins, related watershed characteristics.We found consistent behaviors at lowest highest exchange flux (HEF) quantiles, HEF-dependent elevation, precipitation, land-cover.Our results also suggest variability allometry for middle relation findings provide initial evidence that may be useful predicting dynamics watersheds reach basin scales. Scientific Significance Statement:The zone is control point like are important determinants move process carbon nutrients.However, the characterized by spatial heterogeneity, which functions change scales.This study applies theory, suggests function scales predictable way with size, determine if area basins contrasting some tool transferable knowledge note site-specific constrain generalizability this method other regions watersheds.

Language: Английский

---

Groundwater-Surface Water Interactions Research: Past Trends and Future Directions

Published: Jan. 1, 2024

Download This Paper Open PDF in Browser Add to My Library Share: Permalink Using these links will ensure access this page indefinitely Copy URL DOI

Language: Английский

---