论文部分内容阅读
我们陕西水利访美考察团从美国著名城市拉斯维加斯出发,汽车沿着荒漠疾驰,不到一小时,便来到了科罗拉多河畔。在陡峭的峡谷中巍然屹立着一座混凝土大坝,将河水拦腰截断,这就是胡佛水库大坝。 科罗拉多河流域,是美国自然条件最差的一个流域,以山地、高原、峡谷、沙漠为主,兼有平原,地质地貌复杂.景观丰富。著名的科罗拉多大峡谷位于胡佛大坝上端,全长349公里,被该河切割成深达1800米的大峡谷。这里降雨稀少,下游年降雨量仅90毫米,
Our delegation from Shaanxi Province visited the United States from Las Vegas, a famous city in the United States. As the car gallopped along the desert, it took less than an hour to come to the Colorado River. In a steep canyon stands a concrete dam, cut off the river, which is the Hoover Dam. The Colorado River Basin is one of the worst watersheds in the United States. It is dominated by mountains, plateaus, valleys and deserts, with plains and complex geological landscapes. The famous Grand Canyon of Colorado is located at the top of Hoover Dam, a total length of 349 kilometers, was cut into the Grand Canyon 1800 meters deep Grand Canyon. Rare rainfall here, the downstream annual rainfall of only 90 mm,