河湖连通工程的实施为洪水资源的引蓄利用提供了有力保障。洪水引蓄过程中, 安全与效益并重。基于洪水 的双重属性, 文章利用 MIKE11 一维水动力学模型及相关的流量、水量计算方法对洮儿河白城境内的河湖连通系 统洪水引蓄的安全值以及各受水单元( 湖泡、湿地、灌区) 的需水量进行了界定。结果表明: 20 年一遇及以下量级洪 水可保证河道全线安全引水, 河道最大安全流量为2 140 m3 / s; 河道三个区间的生态基流分别为 41 79 m3/ s、31 19 m3 / s、21 97 m3 / s; 河道外受水单元需水量上限值为 91 38 @ 108 m3 , 需水量下限值为51 60@ 108 m3。河湖连通系统加 强了河道内外的水力联系且河道内外供需水相互影响, 边界阈值的确定将为洪水资源利用过程中的调度决策提供 重要参考。

The river-lake inter co nnectio n project pro vides str ong support fo r flo odw ater diversion and sto rag e. In this process, se2 curity and benef its are equally impo rtant. Based o n the double attributes of the flo od, w e used MIKE11 o ne2dimensional hydro2 dynamic model and the r elated calculation methods to calculate the safe value of f loo d st orag e in the river2lake inter connected sy stem and the water demand o f wetlands, ponds, and irrigated areas. The r esults indicated that the g ate can o pen for diversio n when t he r etur n period of flo od events is 20 years o r below . T he max imum safe flow of the riv er is 2 140 m3 /s, and the ecolog i2 cal base f low of different segments of the riv er is 41 79 m3 /s, 31 19 m3 /s, and 21 97 m3 /s respectively. T he w ater demand o f w et2 lands, ponds, and irrig ated areas is 51 60 @ 108 m3 to 91 38 @ 108 m3 . The river2lake inter co nnected system has strengt hened the hy dr aulic connection inside and o utside the riv er, and t he bo unda ry threshold w ill prov ide important refer ence fo r the dispatc2 hing decisio n2making in the pro cess of f loo d r eso urces utilizatio n.

国家重点研发计划( 2016YFC0400903) ; 国家自然科学基金( 51679026) ; 中央高校基本科研业务费资助项目( DUT 17JC17)