Natural Hazards and the Sediment Cascade

A special issue of Earth (ISSN 2673-4834).

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 3199

Special Issue Editors

1. Laboratory of Sediment Hazards and Disaster Risk, Fukae-Campus, Kobe University, Higashinadaku, Minami-Fukae-Machi, 5-1-1, Kobe, Japan
2. PSBA Laboratory, Department of Geography, Adjunct at Universitas Gadjah Mada, Yogyakarta 55281, Daerah Istimewa Yogyakarta, Indonesia
Interests: geomorphology; mass movements (landslides and debris flows) hazards and disaster risk and sediment processes simulations
Special Issues, Collections and Topics in MDPI journals
Department of Soil Science, Faculty of Agriculture, Universitas Gadjah Mada, Sleman, Daerah Istimewa Yogyakarta, Indonesia
Interests: geohazard form soil science perspective; land resources development planning; pedogeomorphology; soil and water conservation
Department of Geography, University of Namibia, Private Bag 13301, 340 Mandume Ndemufayo Avenue, Pioneerspark, Windhoek, Namibia
Interests: floods; climate modelling; fluvial geomorphology; remote sensing and GIS

Special Issue Information

Dear Colleagues,

The Earth is working through cycles: rock, sediment, water, carbon, etc., all at different velocities, intensities, and sometimes with hiccups that accelerate these cycles (e.g., earthquakes, volcanic eruptions, tsunamis). With or without these hiccups, numerous hazards are often associated with the movements of sediments (landslides, debris flows, river floods, tsunamis, liquefaction, etc.). For the present Special Issue, we would like to invite contributions looking at the mechanics, spatial distribution, and timing of sediment-related hazards, from the mountain to the sea, so that these apparently different systems that are often academically separated appear for what they are: interconnected systems. This Special Issue is therefore interested in all hazards involving sediments (landslides, debris flows, floods, tsunamis, liquefaction, etc.), which the Editors will tie together in an Editorial by presenting the sediment cycle in the light of your contributions. The Editors are particularly interested in contributions relating those hazards to climate change and how climate change is most likely to modify the sediment cycles and related hazards.


Prof. Dr. Christopher Gomez
Prof. Dr. Junun Sartohadi
Dr. Frans Persendt
Guest Editors

Manuscript Submission Information

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Keywords

  • sediment cascade
  • hazards
  • climate change
  • debris flows
  • landslides
  • floods
  • tsunamis
  • sediment connectivity
  • soil mechanics

Published Papers (1 paper)

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Research

16 pages, 17559 KiB  
Article
Impact of Wind on the Spatio-Temporal Variation in Concentration of Suspended Solids in Tonle Sap Lake, Cambodia
by Michitaka Sato, Rajendra Khanal, Sovannara Uk, Sokly Siev, Ty Sok and Chihiro Yoshimura
Earth 2021, 2(3), 424-439; https://0-doi-org.brum.beds.ac.uk/10.3390/earth2030025 - 06 Jul 2021
Cited by 5 | Viewed by 2521
Abstract
Even though wind, water depth, and shear stress are important factors governing sediment resuspension in lakes, their actual relations to total suspended solids (TSS) distribution in natural environments have not been well elucidated. This study aims to elucidate the impact of the wind [...] Read more.
Even though wind, water depth, and shear stress are important factors governing sediment resuspension in lakes, their actual relations to total suspended solids (TSS) distribution in natural environments have not been well elucidated. This study aims to elucidate the impact of the wind on the spatio-temporal variation of TSS in Tonle Sap Lake, Cambodia, during low-water (March and June, <1 m) and high-water (September and December, 8–10 m) seasons. To this end, wind and TSS data for December 2016 and March, June, and September 2017 were collected and analyzed. For spatial interpolation of wind speed, the inverse distance weighted method was found to be better (R2 = 0.49) than the vectorized average (R2 = 0.30) and inverse of the ratio of distance (R2 = 0.31). Spatial interpolation showed that the wind speed and direction on the lake were <5 m/s and southward during the low-water season and <7 m/s and westward during the high-water season. The TSS concentration in the low-water season was higher (>50 mg/L) than that in the high-water season. The TSS concentration during the low-water season was empirically described by wind speed (W), water depth (D), and shear stress (τ_wave) with a function of W3, W3/D, and exp(W/D) or exp(τ_wave), depending on the location in the lake. The critical shear stress due to wind-induced waves at most of the places in the lake was higher than the total shear stress indicated. Sedimentation was predominant in December and June, and erosion (siltation) was dominant in March. Most of the siltation in March was dominant in the southern part of the lake. Full article
(This article belongs to the Special Issue Natural Hazards and the Sediment Cascade)
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