Abstract Sediment dispersal in estuaries is an important topic in the study of estuarine and coastal processes. In this paper, sediment particle size data of a large amount of deposit sections and cores on the Yellow River delta and long-term monthly mean sediment size composition of riverine input were collected and analyzed, and the sediment dispersal in the Yellow River estuary was quantitatively studied. The results show that the sediment carried into the Yellow River mouth is composed mainly by silt-sized grains and secondarily by the clay-sized and sand-sized grains, without a long-term trend in the annual mean median particle size. There is no significant discrepancy of clay, silt and sand content between the deltaic plain sediment and riverine sediment input. Compared with the riverine input, the delta front sediment has a lower clay content, a higher sand content, and a similar silt content. The clay content of pro-delta sediment is about twice that of riverine input, and its sand content is much lower than that of riverine input. Although the silt content of the pro-delta is significantly lower than that of the riverine input, it is still over 50%. It is found that deposition and dispersal of different grain-size sediments in the delta can be quantified from the amount of riverine sediment input and the grain-size composition of the riverine sediment and deposits in the delta. The estimated amount of deposition and dispersal of different grain-size sediments in a sub-delta of the Yellow River showed that almost all sand-sized grains, nearly three-fourths of silt-sized grains and more than half of the clay particles were retained behind the delta front slope. The percentage of silt particles in the sediments that dispersed out of the delta front edge was more than 50%, so a high portion of the sediments that dispersed offshore tended to be deposited on the pro-delta surface in a short distance, leaving less sediment to be transferred to the deep sea. The results of this study are of reference value for understanding the processes of sediment dispersal in estuaries and the landform evolution of the Yellow River delta. Keywords:Yellow River delta;deltaic facies;grain size composition;sediment dispersal
PDF (1614KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 师长兴. 黄河口不同粒度泥沙沉积与扩散分析. 地理研究[J], 2021, 40(4): 1125-1133 doi:10.11821/dlyj020200203 SHI Changxing. Deposition and dispersal of different grain-size sediments in the Yellow River estuary. Geographical Research[J], 2021, 40(4): 1125-1133 doi:10.11821/dlyj020200203
Tab. 1 表1 表1黄河利津站输沙和三角洲沉积物粒度组成特征 Tab. 1Mean grain size composition of suspended sediment measured at Lijin gauging station and deposits in the Yellow River delta
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