洞庭湖区开沟沥水工程灭螺效果与防洪安全性动态模拟分析

发布时间：2019-03-14 16:40

【摘要】：目的探索开沟沥水工程的灭螺效果和防洪安全性,并探讨最优工程设计方案。方法对开沟沥水工程进行回顾性研究,确定工程发挥效果的指标参考值。以洞庭湖区岳阳市南湖新区堤外洲滩为例,截取与大堤中心线垂直的洲滩横截面进行研究,以FLAC~(3D)软件,按照不同水位的情况,对开沟沥水工程的安全性、有效性进行动态模拟。结果当相对地下水位下降达0.35 m,洲滩土壤含水量相应降低时,开沟沥水工程将发挥灭螺效果。软件动态模拟分析表明,横沟1、纵沟与大堤堤脚应分别保持25 m和13 m以上的安全距离;横沟、纵沟的挖深以1.2 m、1.0 m为宜;当枯水期洲滩宽度在500 m以下时,设置1条横沟即可,宽度超过500 m则应设置间距300 m的2条横沟。结论开沟沥水工程灭螺效果良好。合理设计纵沟、横沟、堤脚之间距离和挖沟深度,可优化工程的效果和安全性。
[Abstract]:Objective To explore the molluscicidal effect and flood control safety of the ditching and draining project, and to explore the optimal engineering design scheme. Methods A retrospective study of the trenching and draining project was carried out to determine the reference value of the project's effect. In this paper, the cross-section of the bank in the vertical direction of the central line of the dike is studied by taking the bank of the South Lake New Area of the Dongting Lake area as an example, and the FLAC ~ (3D) software is used to simulate the safety and effectiveness of the trenching and draining project according to the situation of different water levels. As a result, when the relative water level is reduced to 0.35m, the water content of the soil in the beach is reduced correspondingly, and the water content of the ditching and draining works will play a molluscicidal effect. The software dynamic simulation analysis shows that the safety distance of 25m and more than 13m shall be maintained for the transverse channel 1, the longitudinal groove and the levee, and the depth of the transverse groove and the longitudinal groove shall be 1.2 m and 1.0m, and when the width of the river beach in the dry season is less than 500 m, one transverse groove shall be set. 2 transverse grooves with a width of 300 m shall be provided with a width of more than 500 m. Conclusion The water-killing effect of the ditching and draining engineering is good. Reasonable design of the distance between the longitudinal groove, the transverse groove and the causeway and the depth of the trenching, and the effect and the safety of the project can be optimized.
【作者单位】：湖南师范大学美术学院环境设计系;湖南省血吸虫病防治所;湖南省岳阳市血吸虫病防治领导小组办公室;
【基金】：国家自然科学基金(41371487)
【分类号】：R532.21;R184.3

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