艾利河段泥沙输移特性及不淤临界含沙量探讨

对艾山—利津河段泥沙输移特性进行的分析表明：①艾山以下窄河段的河床演变具有“大水冲、小水淤”及“细沙冲、粗沙淤”的基本特点,并且淤积主要集中在非汛期,粗沙、中沙及细沙均发生淤积;汛期除粗沙淤积外,细沙及中沙均发生冲刷。②艾山—利津河段河道冲淤主要与流量大小有关。同时,根据1960～2002年的洪水资料,分析了粗沙、中沙、细沙冲淤的临界流量,建立了艾山—利津河段不同粒径组泥沙排沙比与流量间的关系;考虑到洪水演进及区间引水引沙等因素,初步建立了在洪水期艾山—利津河段不发生淤积的条件下艾山站临界含沙量与流量间的关系式。

Approach to Characteristic of Transport of Sediment and Critical Sediment Concentration of no Deposition in Aishan- Lijin Section

The analysis on the characteristic of sediment delivery in Aishan-Lijin section shows that: a) The river-bed evolution at narrow section downstream of Aishan has the basic characteristics of "scouring as a major flood and deposition as its small" and "fine sand is scoured and coarse ones deposited" and deposition including coarse, medium-sized and fine sand is mainly happened in non-flood season. In flood season, the medium-sized and fine sand are all washed away except the deposition of coarse sand. b) The scouring and deposition in Aishan-Lijin section are mainly related with discharge. According to the flood data from 1960 to 2002 and analysis on critical discharge for scouring and deposition of coarse, medium-sized and fine sands, the paper establishes a relationship between sediment delivery rate of different particle sizes and discharge of Aishan-Lijin section and initially establishes a relational expression between critical sediment concentration and discharge of Aishan Station under the conditions of no deposition happened in Aishan-Lijin section during flood season after considering the factors of flood routing and water and sediment diversion of the reach.