scholarly journals Detrital grain size distribution of the surface sediments and sedimentary processes in Lake Kizaki, central Japan

2012 ◽  
Vol 71 (1) ◽  
pp. 3-13 ◽  
Author(s):  
Takuma Ito ◽  
Fujio Kumon
Keyword(s):  
Grain Size ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Surface Sediments ◽  
Sedimentary Processes ◽  
Central Japan

GRAIN SIZE DISTRIBUTION OF SURFACE SEDIMENTS IN THE SOUTHWESTERN SOUTH CHINA SEA AND TRANSPORT TREND ANALYSIS

2013 ◽  
Vol 33 (6) ◽  
pp. 1 ◽  
Author(s):  
Qunhui YANG ◽  
Mujun LI ◽  
Shengxiong YANG ◽  
Benduo ZHU ◽  
Fuwu JI ◽  
...  
Keyword(s):  
Grain Size ◽  
South China Sea ◽  
Trend Analysis ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
South China ◽  
Surface Sediments ◽  
China Sea

scholarly journals Grain-Size Distribution of Surface Sediments in the Chanthaburi Coast, Thailand and Implications for the Sedimentary Dynamic Environment

2020 ◽  
Vol 8 (4) ◽  
pp. 242 ◽  
Author(s):  
Chengtao Wang ◽  
Min Chen ◽  
Hongshuai Qi ◽  
Wichien Intasen ◽  
Apichai Kanchanapant
Keyword(s):  
Grain Size ◽  
Standard Deviation ◽  
Trend Analysis ◽  
Size Distribution ◽  
Grain Size Distribution ◽  
Surface Sediments ◽  
Sedimentary Environment ◽  
Hydrodynamic Conditions ◽  
Deviation Analysis ◽  
Grain Size Trend Analysis

This paper analyzes the grain-size distribution of surface sediments of the Chanthaburi coast of Thailand to investigate the sedimentary environment and its evolution to better use and protect the coast. The Flemming triangle method, the grade-standard deviation method, and the Gao–Collins grain-size trend analysis method (GSTA model) were used to study the dynamic sedimentary environment of the area and provide preliminary identification of source materials. There are seven types of surface sediments on this coast, with grain sizes (φ) generally consisting of sand and silt. Sorting is generally poor, and becomes gradually poorer with distance offshore. Skewness is generally positive. The study area is mainly composed of sand and silt, indicating that the hydrodynamics are strong. The results of grade-standard deviation analysis indicate that sediment grain size b (3.25–4.5φ) is a sensitive indicator of environmental change. This sediment type exhibits a relatively complex transport trend, mainly characterized by northwestward and northeastward transport from sea to land. Sediments at the mouth of the Chanthaburi Estuary and the Welu River fluctuate under the influence of tidal currents. Based on the results of grade-standard deviation analysis and grain-size trend analysis, the study area was divided into three provinces, representing different sedimentary environments and material sources. Compared with tidal-controlled estuaries in the temperate regions of eastern China, the two tropical estuaries examined in this study exhibited smaller suspended sediment loads, runoff amounts, and tidal ranges. However, hydrodynamic conditions were generally stronger. The main reasons for the similarities and differences in the transport trends of sediments in these estuaries were differences in hydrodynamic conditions and the specifics of regional topography.

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