《2.32黄河的治理.ppt

第三节 黄河的治理 简介黄河大合唱 一、母亲河 2、母亲河的奉献 一、母亲河 2、母亲河的奉献 灌溉作用 丰富的旅游资源 对郑州的贡献 知黄河 1、概况 （1）源头 入海口： （2）河段划分：▲ （3）流经的省区和地形区 黄河水系 小结 世界上含沙量最大的河流 二、忧患河 1、上游——荒漠化 二、忧患河 1、上游——凌汛 凌汛 二、忧患河 2、中游——水土流失 二、忧患河 2、中游——水土流失 二、忧患河 3、下游——悬河▲ 二、忧患河 3、下游——悬河▲ 二、忧患河 3、下游——悬河▲ 二、忧患河 4、断流 二、忧患河 4、断流 小结 思考： “悬河”造成的隐患是什么？ Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 在新中国成立前的2000多年间，仅黄河下游河段泛滥达1500多次，吞噬了无数的生命财产。经黄河肆掠过的土地往往变成了沙荒地、盐碱地、呈现出一片荒凉景象。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 断流天数 断流起止月份 70 年代 9 5月—6月 80 年代 11 1995年 121 2月—11月 1996年 133 1997年 226 1998年 137 断流时间越来越长、 断流开始的时间越来越早 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. * * Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 中华民族发祥地 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 三门峡水电站 水能 资源 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 塞上江南 宁夏平原 河套平原 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspo