黏性泥沙含量对富粉砂床面沙纹特征影响试验研究OA

Silt-enriched beds,characterized by silt content exceeding 60％and clay content below 20％,are widely distributed along the coast of Jiangsu province.However,studies on the ripple characteristics of such beds remain limited,and it is still unclear whether their features are consistent with the existing findings on sand-mud mixed beds.To address this gap,a series of unidirectional steady-flow experiments with flow veloci-ty of 40 cm/s were conducted using four groups of silt-enriched sediment samples with cohesive sediment con-tents(medium particles size is finer than 8 μm)of 2.1％,6.2％,8.5％,and 10.1％,respectively.The re-sults show that the silt-enriched bed still behaved as a non-cohesive bed when the cohesive sediment content is lower.With the increasing of cohesive sediment content,the initiation of ripples and the time required to reach equilibrium gradually increase,while ripple dimensions at equilibrium decrease,and the average growth rates of both wavelength and height continuously decline.As the cohesive sediment content further increased,the bedform will transform into a cohesive bed,with all parameters tending toward stabilization.