Economic evaluation of using marine dredged material for erosion control along the northeast coast of the Nile Delta, Egypt

Frihy, Omran E.; Moufaddal, Wahid; Deabes, Essam A.; Helmy, Essam El Din

doi:10.1007/s12517-016-2660-y

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…Similarly, SES has the same aims as "restoration sedimentology" but also acknowledges the interaction of both sedimentation and ecological processes in building land (Edmonds, 2012). Our definition for SES does not include artificial sedimentation strategies such as beach nourishments (e.g., Sand Engines (Stive et al, 2013)) or beneficial relocation of dredged sediment (Baptist et al, 2019;de Vincenzo et al, 2018;Frihy et al, 2016). These activities can be helpful in enhancing local sedimentation but require active management to import external sediment while SES focus on reuse or redistribution of sediment by harnessing existing natural river, tidal, and vegetation processes.…”

Section: What Are Sedimentation-enhancing Strategies (Ses)?mentioning

confidence: 99%

A global synthesis of the effectiveness of sedimentation-enhancing strategies for river deltas and estuaries

Cox

Paauw

Nienhuis

et al. 2022

Global and Planetary Change

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Section: What Are Sedimentation-enhancing Strategies (Ses)?mentioning

confidence: 99%

A global synthesis of the effectiveness of sedimentation-enhancing strategies for river deltas and estuaries

Cox

Paauw

Nienhuis

et al. 2022

Global and Planetary Change

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“…According to the "Kumamoto Restoration and Rehabilitation 4-Year Strategy issued" by the Kumamoto Prefecture of Japan in December 2016, it was decided to build a new reservoir 237 m upstream of the original Kumamoto Ohkirihata Reservoir. This process produces considerable amounts of WDC sediments, which are classified as waste [27]. During the field investigation, WDC showed a high liquid limit different from other clays, and its natural water content was higher than its liquid limit.…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study of Low-Environmental-Load Methods for Treating High-Water-Content Waste Dredged Clay (WDC)—A Case Study of WDC Treatment at Kumamoto Prefecture Ohkirihata Reservoir in Japan

Zhang

Omine

et al. 2023

Sustainability

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The effective and sustainable treatment of high-water-content waste dredged clay (WDC) remains a significant challenge in water conservancy engineering. In this study, we focused on the treatment of WDC produced by Kumamoto Ohkirihata Reservoir. The study examined the effect of two types of cement-based solidifiers, namely, ordinary Portland cement (OPC) and cement–fly ash agent (DF), on three clay samples collected from different locations. The cone index test was used to assess the samples’ properties. The dosage of cement required for effective improvement with DF was significantly reduced (by about 47–55%), compared to OPC. Moreover, the dewatering efficiency of WDC improved by the simple dewatering method of vertically placing environmental protection materials. Within seven days, the average water content of the WDC decreased to below the liquid limit compared with natural air drying. Finally, the dosage of DF required to stabilize the WDC under effective improvement conditions was reduced by 37–58%, which is higher than the dosage of OPC reduction (22–50%). The reduction in water content reduced the pore space of the soil particles, benefiting the internal bonding of DF-stabilized clay. Dewatering methods facilitate the use of DF solidifiers, facilitating sustainable and environmentally friendly improvement in WDC.

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“…Sustainable re-use of sediment to target sediment starved areas is becoming increasingly common in deltas globally (Frihy et al, 2016;De Vincenzo et al, 2019;Baptist et al, 2019b). However, in the RMD, the sediment that is dredged is either dumped off the coast (if uncontaminated), sold to market (mostly sandy sediment) or stored in a depot known as the "Slufter" (if contaminated).…”

Section: Negative Effects Of a Negative Sediment Budgetmentioning

confidence: 99%

“…Similarly, SES has the same aims as "restoration sedimentology"but also acknowledges the interaction of both sedimentation and ecological processes in building land (Edmonds, 2012). Our definition for SES does not include artificial sedimentation strategies such as beach nourishments (e.g., Sand Engines (Stive et al, 2013)) or beneficial relocation of dredged sediment (Baptist et al, 2019b;De Vincenzo et al, 2019;Frihy et al, 2016). These activities can be helpful in enhancing local sedimentation but require active management to import external sediment while SES focus on reuse or redistribution of sediment by harnessing existing natural river, tidal, and vegetation processes.…”

Section: What Are Sedimentation-enhancing Strategies (Ses)?mentioning

confidence: 99%

Saved or starved? The importance of sediment management in determining the future response of estuaries and deltas.

Cox¹

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The primary mechanism which forms and maintains estuary and delta morphology and elevation is sedimentation. Sediment deposited annually may offset elevation loss due to relative sea-level rise (SLR). So, to quantify the amount of sediment that is delivered is of crucial importance to predict if estuaries and deltas will be saved by or starved of sediment and therefore sustain their elevation or sink. Here, we assess and quantify sediment budgets and sediment management; and evaluate morphological responses of estuaries and deltas to both anthropogenic and climate changes over various timescales. I focus on urbanized deltas which are undergoing a high degree of sediment management like the Rhine-Meuse delta (RMD), the Netherlands. The Rhine--Meuse delta has an annual loss of sediment. Predictions for future sediment loss are the largest in scale in the 3500 year history of the delta. It is caused by extensive dredging and an uneven distribution of sediment over the channel network. Most sediment delivered by upstream rivers and from the coastal boundary becomes trapped in the very deep mouth area. Meanwhile, the tidal cross-cut channels and southern part of the system are sediment starved. This uneven distribution has negative implications for ecosystems including the loss of intertidal areas, causing danger to infrastructure (dikes, groynes, underground cables and tunnels), increasing flood risk and leading to higher dredging volumes (and costs) annually. The thesis finds that sediment management techniques i.e. sand mining and dredging are causing negative sediment budgets in many urban deltas. This is the primary threat in the short term (next 100 years) for most European estuaries and deltas. SLR will affect dredged and undredged estuaries differently. The floodplains and intertidal areas of dredged estuaries will actually take longer to drown than undredged estuaries. In undredged estuaries, the uneven elevation decreases the rate of drowning. However, the excess energy due to SLR will manifest itself as either meander expansion in unconstrained estuaries or as bed and bank erosion in constrained/embanked estuaries. This thesis suggests that many of the world's estuaries and deltas are at risk of land loss due to a lack of sediment. To that end, solutions which can enhance sedimentation and raise land in estuaries and deltas are urgently required. In our review of existing and planned sedimentation enhancing strategies (SES), it was found that 79% of strategies can offset even the most extreme of sea-level rise rates but available space, particularly in urban deltas is a vital challenge in their implementation. For centuries, channel networks have been shaped by port development and global growth in ship size. In such urbanized multi-channel systems, dredging and sediment management are causing an imbalance in hydrodynamics and sediment transport leading to erosion, loss of intertidal areas and increased flood risk. To tackle these issues, two things are required: 1) a positive sediment budget - enough sediment to build and sustain the desired morphology and to protect areas at risk and 2) sediment reconnectivity - protecting sinking areas by reconnecting them to fluxes of water and sediment.

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Economic evaluation of using marine dredged material for erosion control along the northeast coast of the Nile Delta, Egypt

Cited by 11 publications

References 18 publications

A global synthesis of the effectiveness of sedimentation-enhancing strategies for river deltas and estuaries

A global synthesis of the effectiveness of sedimentation-enhancing strategies for river deltas and estuaries

Feasibility Study of Low-Environmental-Load Methods for Treating High-Water-Content Waste Dredged Clay (WDC)—A Case Study of WDC Treatment at Kumamoto Prefecture Ohkirihata Reservoir in Japan

Saved or starved? The importance of sediment management in determining the future response of estuaries and deltas.

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