天气预报15天查询> 其他> 飞沙堰的排沙原理

飞沙堰的排沙原理

更新时间: 2019-03-31 00:00:00     

流体力学中的弯道回旋流原理。飞沙堰溢洪道又称“泄洪道”,具有泄洪、排沙和调节水量的显著功能,故又叫它“飞沙堰”。飞沙堰的一个作用是“飞沙”,岷江从万山丛中急驰而来,挟着大量泥沙、石块,如果让它们顺内江而下,就会淤塞宝瓶口和灌区。 古时飞沙堰,是用竹笼卵石堆砌的临时工程;如今已改用混凝土浇铸,以保一劳永逸的功效。

关键词: 原理

如有意见、反馈、侵权或投诉等情况,请联系:

电话:
邮箱:

我们将会在48小时内给与处理!

版权所有 Copyright ? 2009-2020 tianqiyubao3.com

页面:/news/view-1371849/ | 耗时:0.2889 s | 内存:1.89 MB | 查询:4 | 缓存读取:4 写入:0 | 加载文件:23
select * from tbl_Articles WHERE ArticleID=1371849 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1371849 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1371849 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1103287,1113890,1118134,1077976,1084437,1077533,1120149,1070578,1095137,1074843,1061328,1085888,992026,1042979,1043609,1108219,1056160,1098403,1115755,1103841,1067089,1074129,1095011,1115563,1110027,1095646,1118771,1120418,1065495,1044442) ORDER BY field (ArticleID,1103287,1113890,1118134,1077976,1084437,1077533,1120149,1070578,1095137,1074843,1061328,1085888,992026,1042979,1043609,1108219,1056160,1098403,1115755,1103841,1067089,1074129,1095011,1115563,1110027,1095646,1118771,1120418,1065495,1044442)