High concentration suspended sediment measurements using time domain reflectometry

Chung, Ching-Che; Lin, Chih Ping

doi:10.1016/j.jhydrol.2011.02.016

Cited by 34 publications

(44 citation statements)

References 16 publications

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“…(a) To measure the change in apparent dielectric constant directly [17] and (b) To measure the change in capacitance and use it to find SSC through a pre-established empirical relation [36].…”

Section: Electrical Properties-based Cmtmentioning

confidence: 99%

“…In their approach, Chung and Lin [17] considered a commercially available Time Domain Reflectometry (TDR) device, commonly used for cable fault detection, for continuous SSC measurement.…”

Section: Electrical Properties-based Cmtmentioning

confidence: 99%

“…Through laboratory studies, Chung and Lin [17] reported the capability of TDR to measure high SSC values (in range 2-300 g/l) but they found the reading highly influenced by temperature change. A variation of 0.1°C in water temperature may change SSC measurements as high as 800 mg/l.…”

Section: Electrical Properties-based Cmtmentioning

confidence: 99%

“…Hsu et al [36] found the errors in measuring SSC between 0.26% and 2.91% for the range of SSC 0-200 g/l in controlled laboratory experiments. These measurements depend on the salinity of water and the presence of air bubbles, algae and thrash in the sediment-laden water [17]. Moreover, the technique is intrusive and susceptible to biological fouling.…”

Section: Electrical Properties-based Cmtmentioning

confidence: 99%

See 3 more Smart Citations

Continuous measurement of suspended sediment concentration: Technological advancement and future outlook

Kumar

2015

Measurement

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Section: Electrical Properties-based Cmtmentioning

confidence: 99%

“…In their approach, Chung and Lin [17] considered a commercially available Time Domain Reflectometry (TDR) device, commonly used for cable fault detection, for continuous SSC measurement.…”

Section: Electrical Properties-based Cmtmentioning

confidence: 99%

Section: Electrical Properties-based Cmtmentioning

confidence: 99%

Section: Electrical Properties-based Cmtmentioning

confidence: 99%

See 2 more Smart Citations

Continuous measurement of suspended sediment concentration: Technological advancement and future outlook

Kumar

2015

Measurement

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“…A variety of technical concerns may emerge at any individual project. The methodological and financial challenges associated with monitoring sediment inflows for sediment management was the most common technical barrier we identified for the our Taiwan case studies in Taiwan, though methods for monitoring sediment are well established [57]. The loss of water supply associated with sediment flushing and sediment pass-through was also a common technical barrier across our case studies, as it has been reported for projects globally [52].…”

Section: Barriers To Sustainable Reservoirsmentioning

confidence: 94%

Sediment Management in Taiwan’s Reservoirs and Barriers to Implementation

Wang

Kondolf

Tullos

et al. 2018

Water

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Abstract:Reservoirs play a critically important role in supplying water for human uses. However, sedimentation limits storage capabilities and increases risk for aging infrastructure. The objectives of this paper are to synthesize both general sediment management strategies and past sediment management efforts in Taiwan in order to identify the barriers to more effective sediment management in reservoirs globally. A review of the broader literature and six Taiwan case studies was conducted to examine the characteristics, limitations, costs, and effectiveness of different sediment management strategies. Results highlight how social barriers play an important role in limiting reservoir sustainability, particularly the crisis-response approach to addressing sedimentation and the low priority for sediment management relative to competing objectives, such as tourism. Technical barriers are driven primarily by the engineering and costs of retrofitting existing dams and site conditions that may inhibit particular practices at any given site. Results also highlight tradeoffs in the effectiveness, costs, and time efficiency of various sediment management strategies in restoring storage capacity. The high sediment loads and rapid filling of reservoirs in Taiwan provide early insight into the management issues that are emerging worldwide, and these results emphasize the need for proactive engineering and management of sediment in reservoirs globally.

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A new geophone device for understanding environmental impacts caused by gravel bedload during artificial floods

Tsubaki

Kawahara

Zhang³

et al. 2017

Water Resources Research

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To assess the contribution of gravel bedload on the removal of attached‐algae and aquatic plants from a cobble‐bed river during small floods, we propose a geophone type method for measuring the local bedload of non‐uniform sized gravel. Due to limited peak discharge for focused events during our study, a large fraction of bed material (here cobbles) was immobile and only a small fraction of bed material (sand and gravel) was expected to be transported during the flushing flows we analyzed. The device we developed has a size equivalent to immobile bed material and a shape similar to bed material (rounded cobbles) at the site. The instrument's design allows avoidance of disturbances in river bed micro‐topography during installation and local bedload transport during floods. A flume experiment was conducted in order to establish an empirical algorithm for estimating the diameter of impacted gravel, and uncertainty related to diameter estimation is discussed. The proposed method was utilized to quantify gravel bedload in a cobble‐bed river during flushing flows. We also discuss the contribution of measured gravel bedload during flushing flows on the removal of attached‐algae (up to a 37% reduction in chlorophyll‐a density) and aquatic plants (a reduction of 38% in dry mass per area). Based on time variation for the measured gravel bedload, we also suggest the propagation of a bed‐form composed of the fine sediment fraction migrating on immobile larger sediment and implications for the propagation of the fine sediment wave for attached‐algae removal.

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High concentration suspended sediment measurements using time domain reflectometry

Cited by 34 publications

References 16 publications

Continuous measurement of suspended sediment concentration: Technological advancement and future outlook

Continuous measurement of suspended sediment concentration: Technological advancement and future outlook

Sediment Management in Taiwan’s Reservoirs and Barriers to Implementation

A new geophone device for understanding environmental impacts caused by gravel bedload during artificial floods

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