The main stream of the Yangtze River, Dongting Lake, and the river network in the Jingjiang reach of the Yangtze River constitute a complex water system. This paper develops a one-dimensional （l-D） mathematical mode...The main stream of the Yangtze River, Dongting Lake, and the river network in the Jingjiang reach of the Yangtze River constitute a complex water system. This paper develops a one-dimensional （l-D） mathematical model for flood routing in the river network Of the Jingjiang River and Dongting Lake using the explicit finite volume method. Based on observed data during the flood periods in 1996 and 1998, the model was calibrated and validated, and the results show that the model is effective and has high accuracy. In addition, the one-dimensional mathematical model for the river network and the horizontal two-dimensional （2-D） mathematical model for the Jingjiang flood diversion area were coupled to simulate the flood process in the Jingjiang River, Dongting Lake, and the Jingjiang flood diversion area. The calculated results of the coupled model are consistent with the practical processes. Meanwhile, the results show that the flood diversion has significant effects on the decrease of the peak water level at the Shashi and Chenjiawan hydrological stations near the flood diversion gates, and the effect is more obvious in the downstream than in the upstream.展开更多
The blocking or reversing effect of the downstream trunk river on its tributary lakes is an essential aspect of river-lake hydraulics. To measure how and the extent to which a trunk river can influence its tributary l...The blocking or reversing effect of the downstream trunk river on its tributary lakes is an essential aspect of river-lake hydraulics. To measure how and the extent to which a trunk river can influence its tributary lakes, we made a case study in Changjiang River and one of its tributary lakes, Lake East Dongting （Lake ED） during a 35-year study period （1980-2014）. Specifically, we investigated Lake ED＇s discharge ability into Changjiang River using stage-discharge relationship curves, and hence the changes of the lake discharge abil- ity under different hydrologic conditions of the Changjiang River. The results show that （1） the Changjiang River does exert a huge impact on the water regimes of Lake ED. And this impact varies seasonally. A variation of 3000 m3/s in Changjiang River＇s runoff would change the lake water level by about 1.1 m in dry seasons, by 0.4 m in wet seasons, and by 0.6 m during severe summer floods. （2） Changes in the Changjiang River runoff triggered by the Three Gorges Dam since 2003 have led to dramatic water regime variations in Lake ED. Other factors, including reduction of lake inflow and the lake bed erosion, also exacerbated the water regime variations in Lake ED.展开更多
2020年汛期长江流域持续出现了5次洪水,荆江三口分洪能力及洞庭湖出流变化直接关系到长江中游防洪安全。基于此,根据最新实测资料分析了2020年汛期荆江三口分洪能力及洞庭湖出流变化规律,并取得了以下主要认识:①与2003~2018年期间相比,...2020年汛期长江流域持续出现了5次洪水,荆江三口分洪能力及洞庭湖出流变化直接关系到长江中游防洪安全。基于此,根据最新实测资料分析了2020年汛期荆江三口分洪能力及洞庭湖出流变化规律,并取得了以下主要认识:①与2003~2018年期间相比,2020年7,8月份荆江三口分流量大幅增加,且在枝城站同等大流量下荆江三口分流量有一定程度增大,其中松滋口分流量明显增大,藕池口略有增大,太平口则有所减小。②荆江三口分流比与枝城站流量呈正相关关系,2020年汛期枝城流量增至38000 m 3/s以上,三口分流比基本在20%以上,其中7月25日三口分流比最大,其数值为26.1%,分流量高达11300 m 3/s。③与2003年相比,2020年汛期在螺山站同等大流量下水位出现不同程度抬高的迹象,可能与该站下游区间入汇流量明显偏大等因素有关;6月13日之前,城陵矶站与螺山站流量比值变化主要受到洞庭湖四水来流的影响;6月14日至9月25日,其比值变化主要受长江干流流量变化的影响,监利站流量快速增加或减小,其比值呈现相反变化规律;监利站流量缓慢变化,其比值变化规律不明显。展开更多
基金supported by the National Key Technologies Research and Development Program (Grant No. 2006BAB05B02)
文摘The main stream of the Yangtze River, Dongting Lake, and the river network in the Jingjiang reach of the Yangtze River constitute a complex water system. This paper develops a one-dimensional （l-D） mathematical model for flood routing in the river network Of the Jingjiang River and Dongting Lake using the explicit finite volume method. Based on observed data during the flood periods in 1996 and 1998, the model was calibrated and validated, and the results show that the model is effective and has high accuracy. In addition, the one-dimensional mathematical model for the river network and the horizontal two-dimensional （2-D） mathematical model for the Jingjiang flood diversion area were coupled to simulate the flood process in the Jingjiang River, Dongting Lake, and the Jingjiang flood diversion area. The calculated results of the coupled model are consistent with the practical processes. Meanwhile, the results show that the flood diversion has significant effects on the decrease of the peak water level at the Shashi and Chenjiawan hydrological stations near the flood diversion gates, and the effect is more obvious in the downstream than in the upstream.
基金Key Research Program of the Chinese Academy of Sciences,No.KFZD-SW-318National Basic Research Program of China,No.2012CB417006National Natural Science Foundation of China,No.41601041
文摘The blocking or reversing effect of the downstream trunk river on its tributary lakes is an essential aspect of river-lake hydraulics. To measure how and the extent to which a trunk river can influence its tributary lakes, we made a case study in Changjiang River and one of its tributary lakes, Lake East Dongting （Lake ED） during a 35-year study period （1980-2014）. Specifically, we investigated Lake ED＇s discharge ability into Changjiang River using stage-discharge relationship curves, and hence the changes of the lake discharge abil- ity under different hydrologic conditions of the Changjiang River. The results show that （1） the Changjiang River does exert a huge impact on the water regimes of Lake ED. And this impact varies seasonally. A variation of 3000 m3/s in Changjiang River＇s runoff would change the lake water level by about 1.1 m in dry seasons, by 0.4 m in wet seasons, and by 0.6 m during severe summer floods. （2） Changes in the Changjiang River runoff triggered by the Three Gorges Dam since 2003 have led to dramatic water regime variations in Lake ED. Other factors, including reduction of lake inflow and the lake bed erosion, also exacerbated the water regime variations in Lake ED.
文摘2020年汛期长江流域持续出现了5次洪水,荆江三口分洪能力及洞庭湖出流变化直接关系到长江中游防洪安全。基于此,根据最新实测资料分析了2020年汛期荆江三口分洪能力及洞庭湖出流变化规律,并取得了以下主要认识:①与2003~2018年期间相比,2020年7,8月份荆江三口分流量大幅增加,且在枝城站同等大流量下荆江三口分流量有一定程度增大,其中松滋口分流量明显增大,藕池口略有增大,太平口则有所减小。②荆江三口分流比与枝城站流量呈正相关关系,2020年汛期枝城流量增至38000 m 3/s以上,三口分流比基本在20%以上,其中7月25日三口分流比最大,其数值为26.1%,分流量高达11300 m 3/s。③与2003年相比,2020年汛期在螺山站同等大流量下水位出现不同程度抬高的迹象,可能与该站下游区间入汇流量明显偏大等因素有关;6月13日之前,城陵矶站与螺山站流量比值变化主要受到洞庭湖四水来流的影响;6月14日至9月25日,其比值变化主要受长江干流流量变化的影响,监利站流量快速增加或减小,其比值呈现相反变化规律;监利站流量缓慢变化,其比值变化规律不明显。
