黄河汛期调水调沙结束 累计排沙超780亿千克|日韩av无码一区二区三区不卡
1. 日韩高清无专砖区2021
2. 日韩av无码一区二区三区不卡
中新社郑州9月17日电 (记者 阚力)中国水利部黄河水利委员会(下称黄委)17日消息称,当日9时,黄委调度小浪底水库按1500立方米每秒下泄,标志着本次黄河汛期调水调沙基本结束。
近期,受华西秋雨影响,黄河中游泾渭河、伊洛河等出现明显涨水过程,黄委联合调度小浪底、三门峡水库,于9月8日启动实施汛期调水调沙。2002年以来,黄委累计实施31次黄河调水调沙,其中15次是汛期调水调沙。
调水调沙是通过人工手段改变黄河水沙不平衡关系的有效途径,利用黄河中游水库适时蓄存或泄放,“清洗”下游河道,实现下游河床不再抬高。
黄委方面称,本次调水调沙持续9天,三门峡水库累计排沙692.1亿千克,出库最大含沙量198千克每立方米;小浪底水库累计排沙88.7亿千克,出库最大含沙量24千克每立方米。
在调度过程中,三门峡水库自9月7日15时起按3000立方米每秒预泄,直至敞泄,为小浪底水库排沙出库提供动力。小浪底、西霞院水库联合调度,根据来水及水库排沙及时调整下泄流量,有效减轻水库河道淤积,同时确保下游河道防洪安全。自9月8日9时起,小浪底水库按2500立方米每秒下泄,控制花园口站流量在2600立方米每秒左右;为应对区间降雨过程,9月10日压减下泄流量至2300立方米每秒;降雨过程结束后,9月13日14时流量恢复至2500立方米每秒。随着上游来水减少,三门峡水库自9月10日15时起按1600立方米每秒下泄,稳步回蓄。小浪底水库9月17日9时按1500立方米每秒下泄,结束汛期调水调沙。(完)
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