8月4日，众多游客在山西吉县黄河壶口瀑布景区观瀑。当日，受洪水影响一度紧急关闭的山西吉县黄河壶口瀑布景区恢复对外开放，景区工作人员在壶口瀑布岸边重新安装好防护栏，并设立警戒区域，确保游客安全。目前，黄河上游形成的三号洪峰尚未对黄河中游产生影响，晋陕峡谷水势平稳。新华社发（吕桂明 摄）   August 4,，Many tourists in the Yellow River's hukou waterfall scenic spot of shanxi JiXian enjoying waterfalls。On that day，Under the influence of shanxi JiXian emergency shut down once the Yellow River's hukou waterfall scenic spot restore opening up，Scenic spot in the staff's hukou waterfall to install these barriers，And the establishment of warning area，Ensure safety tourists。At present，The upper reaches of the Yellow River flood peak of the formation of the number three had yet to affect the middle Yellow River，Shanxi and shaanxi provinces and smooth the canyon。The xinhua news agency hair（LvGuiMing perturbation）