Sedimentological observations and geochemical characteristics of paleo-tsunami deposits along the east coast of Sri Lanka in the Indian Ocean

Ratnayake, Amila Sandaruwan; Wijewardhana, T.D.U.; Haraguchi, Tsuyoshi; Goto, Kazuhisa; Ratnayake, Nalin Prasanna; Tetsuka, Hiroshi; Yokoyama, Yūsuke; Miyairi, Yosuke; Attanayake, A.M.A.N.B.

doi:10.1016/j.quaint.2023.02.015

Cited by 6 publications

(1 citation statement)

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“…Grain size analysis is important in geological research for understanding the physical properties of sedimentary rocks (e.g., strength), depositional environments, sediment transportation/monitoring erosion, and reconstructing past landscapes and environmental conditions (Saengsupavanich et al 2022;Ratnayake et al 2023). In addition, grain size analysis provides important information in ecological conservation for understanding habitat suitability, water quality and resource availability, and nutrient cycling (Siqueira-Silva et al 2020).…”

Section: Importance Of Grain Size Distributionmentioning

confidence: 99%

Grain size distribution of modern beach sediments in Sri Lanka

Perera

Ratnayake

Weerasingha

et al. 2023

Anthropocene Coasts

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Grain size distributions are widely used to describe sedimentary geochemistry, depositional environment, and sediment transportation. The objective of this study is to analyze grain size distributions of modern sandy beach sediments in Sri Lanka. Sediment samples (n = 90) were collected from beach berm, representing the entire coastline of Sri Lanka. Grain sizes were determined by the dry-sieving method. Statistical parameters such as mean size, sorting, skewness, and kurtosis were calculated using GRADISTATV9.1 software for all the sieved sediment samples. Grain size variations (108.2 – 609.8 µm) show that Sri Lanka mainly consists of medium sand, whereas the northeast part of the country mixes with fine sand due to the influence of Bengal fan sediments. The variations of skewness (-0.229 – 0.446) and sorting (1.305 – 2.436) indicate symmetrical distributed moderately sorted samples. These variations specify a moderate energy depositional environment/wave action around the coastline of Sri Lanka. In addition, grain size analysis confirmed relatively high and low energy deposition environments on the west and east coasts, respectively. Accordingly, the west coast is more vulnerable to coastal erosion compared to the east coast of Sri Lanka. Therefore, this study provides the baseline grain size distribution data that can be used in decision-making for coastal zone management by mitigating beach erosion.

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Section: Importance Of Grain Size Distributionmentioning

confidence: 99%