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。
Objective To evaluate the effects of the project of ditching for drain on Oncomelania hupensis snail control and flood prevention security and explore the optimal engineering design plan in Dongting Lake region. Methods A retrospective study was performed on the previous studies about the project of ditching for drain. The reference values of project indices were determined. The outside levee of Nanhu New Distinct of Yueyang City in Dongting Lake region was selected as the study area, and the cross section of marshland perpendicular to the center line of the levee was extracted to research. According to the situations of various water levels, a dynamic simulation was performed on the effect and security of the project of ditching for drain through the software FLAC3D. Results The retrospective study showed that the project would be effective when the relatively subsoil water level decreased by 0.35 m, and the soil water content decreased correspondingly. The dynamic simulation by FLAC3D showed that the minimum safe distances between transverse ditch 1, vertical ditch and levee toe should be 25 m and 13 m respectively. The digging depth of transverse ditch and vertical ditch should be 1.2 m and 1.0 m respectively. If the width of marshland in drought period was less than 500 m, one transverse ditch was efficient. Otherwise, more transverse ditches should be set with the intervals of 300 m. Conclusions The project of ditching for drain is an effective ecological snail elimination method. Optimizing the digging depth of ditches and distances between transverse ditches, vertical ditch and levee toe will ensure the effects and security of the project.
出处
《中国血吸虫病防治杂志》
CAS
CSCD
北大核心
2017年第1期5-11,共7页
Chinese Journal of Schistosomiasis Control
基金
国家自然科学基金(41371487)
关键词
钉螺
血吸虫病
开沟沥水工程
动态模拟分析
洞庭湖
Oncomelania hupensis
Schistosomiasis
Project of ditching for drain
Dynamic simulation analysis
Dongting Lake
