基于Flood Area模型的模袋混凝土衬砌渠道糙率系数改进技术研究
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摘要
以河套灌区建设一分干模袋混凝土衬砌渠道为研究对象,利用Flood Area模型,将糙率系数的设置做区分化处理;对渠道区域与坡面区域进行划分和赋值,在经验参数的基础上,结合建设一分干模袋混凝土衬砌渠道实际情况,设置栅格糙率系数,增加糙率系数的精度。结果表明改进后的方法提高了流速,简化了率定流程,解决了模拟流速普遍偏低的问题。利用高程与糙率系数的函数关系,较全面、真实地仿真模拟模袋混凝土衬砌渠道的流场。
Taking the construction of a dry mould-bag concrete lined canal in Hetao irrigation area as the research object, the Flood Area model was used to differentiate the area with the setting of roughness coefficient. The channel area and the slope area were divided and assigned. Based on the empirical parameters, the roughness coefficient of the grid was set to increase the roughness coefficient accuracy in combination with the actual situation of constructing a dry mold bag concrete lining channel. The results show that the improved method improves the flow velocity, simplifies the calibration process, and solves the problem of generally low simulated flow velocity. Based on the function of height and roughness coefficient,the flow field of the concrete lining channel of mold bag is simulated comprehensively and truly.
Taking the construction of a dry mould-bag concrete lined canal in Hetao irrigation area as the research object, the Flood Area model was used to differentiate the area with the setting of roughness coefficient. The channel area and the slope area were divided and assigned. Based on the empirical parameters, the roughness coefficient of the grid was set to increase the roughness coefficient accuracy in combination with the actual situation of constructing a dry mold bag concrete lining channel. The results show that the improved method improves the flow velocity, simplifies the calibration process, and solves the problem of generally low simulated flow velocity. Based on the function of height and roughness coefficient,the flow field of the concrete lining channel of mold bag is simulated comprehensively and truly.
引文
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[2]刘锋,邱秀云,周著.利用Fluent软件对植物坝覆盖区域流场进行数值模拟[J].水利水电科技进展,2010,30(2):32-35.
[3]胡静,魏清福,曾婧扬.数值模拟中微厚透水物糙率处理方法探讨[J].人民长江,2015,46(17):40-42.
[4]何建京,王惠民.流动型态对曼宁糙率系数的影响研究[J].水文,2002,22(6):22-24.
[5]张磊,王文,文明章.基于“Flood Area”模型的山洪灾害精细化预警方法研究[J].复旦学报(自然科学版),2015,54(3):282-287.
[6]张科利,唐克丽.黄土坡面细沟侵蚀能力的水动力学试验研究[J].土壤学报,2000,37(1):9-15.
[7]苏布达,姜彤,郭业友,等.基于GIS栅格数据的洪水风险动态模拟模型及其应用[J].河海大学学报(自然科学版),2005,33(4):370-374.
[8]张明达,李蒙,戴丛蕊,等.基于Flood Area模型的云南山洪淹没模拟研究[J].灾害学,2016,31(1):78-82.
[9]张洪江,北原曜,解明曙,等.晋西几种不同土地利用状况下糙率系数的研究[J].北京林业大学学报,1994,16(4):86-91.
[10]孙丽.复式渠道水流特性数值模拟研究[D].江苏:河海大学.2007.
[11]罗尊骅,林广发,张容焱,等.Flood Area模型糙率系数改进方法[J].海南师范大学学报(自然科学版),2018,31(1):98-104.