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长江叙渝段存在多个卵石滩,滩险之间相互制约,整治之后存在相互联动效应,所以应以卵石滩群为单元,进行综合整治.卵石滩群的整治难度往往在于无法准确判断哪些卵石滩险为滩群,对卵石滩群关联度分析,确定卵石滩群关联度分析方法尤为迫切.本文以影响卵石滩关联因素之一的水位为代表,根据摄动法的微小扰动原理,提出卵石滩群小扰动关联分析法的概念和相应的计算方法.以长江上游南溪至金鸡尾河段卵石滩群为例,利用一维水流数学模型对山区河道卵石滩群进行关联分析.计算结果与实际情况比较吻合,卵石滩群关联度与卵石滩间距离成反比.分析不同下游控制断面水位微小变化值zj下卵石滩群关联度,发现无论下游控制断面水位降低或是壅高,卵石滩群关联度总是随水位变化值|zj|的增大而逐渐趋于某个定值.
There are many pebble beaches in the section of Syria in the Yangtze River, mutual restraint between beach insurances and interaction effects after remediation, so pebble beach groups should be taken as a unit to carry out comprehensive renovation.The difficulty of rehabilitating pebble beach groups often lies in the inability to accurately determine which pebbles The analysis of the correlation between the pebble beach group and the pebble beach group is particularly urgent to determine the correlation degree of the pebble beach group.Taking the water level which affects one of the pebble beach as a representative, according to the principle of small perturbation of the perturbation method, Taking the pebble beach cluster from Nanxi to Jinjicao section in the upper reaches of the Yangtze River as an example, a one-dimensional water flow mathematical model was used to analyze the association of the pebble beach cluster in mountainous river.The results of the calculation and the actual The correlation between pebble beach group is inversely proportional to the distance between pebble beach.Through analyzing the correlation between pebble beach group under small change value zj of different downstream control section, it is found that pebble beach group is correlated no matter the water level of downstream control section is reduced or high Degree always changes with the water level | zj | and gradually tends to a certain value.