对海南岛西南部龙沐湾70个海滩表层沉积样品与12个近岸水下沉积样品进行粒度分析,结果表明,龙沐湾海滩沉积物以砂为主,平均粒径大都在0～2φ,为粗、中砂.近岸海底沉积物总体分布较细,平均粒径大都在2～6φ,为砂-粉砂-黏土的组合.沉积物粒径呈现由岸向海逐渐变细以及沿岸线南粗北细的趋势,反映了波浪的横向分选作用,以及南来沿岸流的纵向分选作用.另外,经初步判断,龙沐湾岸滩摹本处于冲淤稳定的状态,仅白沙河口以南与丹村河口以南发育有侵蚀岸段.%Longmu Bay is located in the southwest coast of Hainan island, with sand beach along the coastline. 70 sediment samples of beach were sieved using sieve analysis method, and the grain size was analyzed using GRADISTAT software. The results indicate that sediments of beach were mostly composed of sand, and their mean grain size diameters are mainly between 0 ～ 2φ and in moderate or good sorting; 12 seafloor sediment samples near-shore were analyzed, and the result indicates that grain size diameters are mainly between 2 ～ 6φ and show a combination of sand-silt-clay. Sediment grain size is finer and finer from beach to near-shore and from south to north along the coast, which shows the sorting of wave and the influence of long-shore drift from south. Moreover, according to the simple estimation, Longmu Bay beach is relatively stable with a short part eroded in the south of Baisha estuary and south of Dancun estuary.
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