摘要
2011-2012年度凌汛期,黄河下游河道9年来首次未封河。凌汛期内气温较往年无明显变化,1月上旬气温偏高;小浪底水库和西霞院水库联合调度,通过人为控制流量来干预黄河下游凌汛,12月下旬至1月上旬大流量下泄的动力和热力因素推迟了下游河道流凌的时间;黄河下游主河槽最小过流能力已经从2002年的1 800 m3/s提高到了4 000 m3/s,水流保持较大流速。受气温、流量、河槽形态等多方面综合影响,降低了黄河下游封河的可能性。
During the ice run period of 201l to 2012, it is the first time that the lower Yellow River has not freezed - up in recent 9 years. The temperature did not change significantly than former years and it is a little higher in the first ten - day period of January. There is jointly optimal regulation sys-tern between XiaoLangdi and Xixiayuan reservoirs, which can be used for experts control flow to influ- ence the ice run of the lower Yellow River. In the last ten - day period of December to the first ten - day period of January, The power and heating power factors of high flow delayed the ice run time of the lower river. The minimum flow capacity of the lower river has increased from 1800m^3/s in 2002 to 4000m^3/s. , and the flow rate increased accordingly. Impacted comprehensively by temperature, flow, channel morphology, the lower Yellow River was less likely to freeze-up.
出处
《水利科技与经济》
2012年第8期60-62,共3页
Water Conservancy Science and Technology and Economy
关键词
凌汛
封河
气温
流量
小浪底和西霞院水库
黄河下游河道
ice run
freeze - up
temperature
flow
Xiaolangdi and Xixiayuan reservoirs
the low-er Yellow River
