Stream turbidity responses to storm events in a pristine rainforest watershed on the Coral Coast of southern Fiji

Ram, Arishma R.; Terry, James P.

doi:10.1016/j.ijsrc.2016.07.002

Cited by 14 publications

(2 citation statements)

References 54 publications

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“…However, increasing sedimentation due to soil erosion has a negative impact on water quality and marine productivity (Ram and Terry 2016). Such erosion problems caused by mud ows and landslides triggered by these heavy seasonal precipitations is one of the major challenges that is currently faced in the western region of Japan (Al Sawaf and Kawanisi 2020; Hashimoto et al 2020;Tsuchida et al 2014).…”

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confidence: 99%

Investigating rainfall-runoff and turbidly behavior during the rainy season in west of Japan

Sawaf

Kawanisi

Bahreinimotlagh³

2023

Preprint

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Understanding the recent variability in massive rainfall patterns is essential to provide a clear image about underlying hydrological processes that occur over a watershed scale. The main objective of this study is to investigate the variability of rainfall events in Western Japan as a result of climate change and examine the related runoff-turbidity dynamics during rainy season. To fulfill the research objectives, we investigated the changeability of the precipitation records in the Gōno River watershed for the last two decades and the related runoff-turbidity behavior during floods using the turbidity-discharge (T-Q) loops and quantified using an improved hysteresis index. The findings revealed a kind of intense rainfall periodicity of 3 ~ 4 years. In addition, spatial pentads analysis exhibited various intensities of accumulated precipitation suggesting that there is no specific spatial zone of extreme rainfall. Regarding the turbidity-discharge behavior, it was found that clockwise hysteresis patterns were induced by sediment sources from near channel areas, alternatively, anticlockwise pattens were produced due to soil erodibility from the nearby areas. Another interesting finding was a notable behavior of turbidity during floods such as “bursts” or “local peaks” may represent an earlier (or later) arrival of turbid waters from nearby distant sources at an upstream section as a result of an intense precipitation. One of the fundamental challenges in the quantification of hysteresis patterns is that there is no accepted definition on how to determine the start and the end of a flood event which may led to a bias in the quantification of these patterns.

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Section: )mentioning

confidence: 99%

Investigating rainfall-runoff and turbidly behavior during the rainy season in west of Japan

Sawaf

Kawanisi

Bahreinimotlagh³

2023

Preprint

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“…On the other hand, for a watershed with homogenous characteristics such as land cover, soil type, and geology, metrological parameters and river hydrology will likely be the driving force of change in turbidity peaking timing and magnitude (Brasington & Richards, ). In smaller watersheds, rainfall parameters are the primary drivers for hysteresis behaviours (Ram & Terry, ). Furthermore, in‐channel processes and energy exerted by high‐flow events that resuspended riverbed sediments can also cause considerable shifts in hysteresis patterns (Pietroń, Jarsjö, Romanchenko, & Chalov, ).…”

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confidence: 99%

Dynamics of wet‐season turbidity in relation to precipitation, discharge, and land cover in three urbanizing watersheds, Oregon

Chen

Chang

2019

River Research & Apps

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Frequent intense precipitation events can mobilize and carry sediment and pollutants into rivers, degrading water quality. However, how seasonal rainfall and land cover affect the complex relationship between discharge and turbidity in urban watersheds is still under investigation. Using hourly discharge, rainfall, and turbidity data collected from six stations in three adjacent watersheds between 2008 and 2017, we examined the temporal variability of the discharge-turbidity relationship along an urban-rural gradient. We quantified hysteresis between normalized discharge and turbidity by a hysteresis index and classified hysteresis loops during 377 storm events in early, mid, and late wet season. Hysteresis loop index and direction varied by site land cover type and season. Turbidity values peaked quicker in the watersheds with higher degrees of urban development than in a less urbanized watershed. The positive relation between discharge and turbidity was highest in two downstream stations in the mid wet season, whereas it was highest in two upstream stations in the early wet season. Correlation and regression analysis showed that maximum turbidity was best explained by discharge range, and the sensitivity of turbidity to discharge change was higher in the larger downstream watershed than in the small upstream watersheds. A flashiness index was negatively associated with the slope of turbidity versus discharge, suggesting that turbidity is difficult to predict solely on the basis of discharge in flashy urban streams. This paper contributes to a deeper understanding of the spatial and temporal variation of discharge-concentration relationship in urbanizing watersheds, which can help water managers increase the resiliency of waterrelated ecosystem services to impacts of climate change.

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Statistical modeling the effect of sediment physicochemical properties on the concentration of heavy metal (case study: Musa Creek, SW Iran)

et al. 2018

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Stream turbidity responses to storm events in a pristine rainforest watershed on the Coral Coast of southern Fiji

Cited by 14 publications

References 54 publications

Investigating rainfall-runoff and turbidly behavior during the rainy season in west of Japan

Investigating rainfall-runoff and turbidly behavior during the rainy season in west of Japan

Dynamics of wet‐season turbidity in relation to precipitation, discharge, and land cover in three urbanizing watersheds, Oregon

Statistical modeling the effect of sediment physicochemical properties on the concentration of heavy metal (case study: Musa Creek, SW Iran)

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