地理考前知识点最后复习回顾河流专题（Review of geography exam points review River topics）.docVIP

地理考前知识点最后复习回顾河流专题（Review of geography exam points review River topics） Review of geography exam points review: River topics The exit of river inside and outside the name change Chinese South stream: Yuanjiang Honghe - Lancang - Mekong River Nu River - Wenjiang - sal Brahmaputra Brahmaputra The shipping value analysis method: Natural conditions: flat terrain, flat water; abundant rainfall and river flow uniformity, seasonal variation, shipping conditions Social conditions: the basin is economically developed, with a large population and large transportation capacity Example: the reasons for the great value of river shipping in Western Europe include the abundance of rivers, the stability of the water level, the small amount of sediment, the absence of ice age, the developed economy in the basin, the large population, the large amount of transportation, and the great value of river shipping Example: Russia (OB Yenisei, Lena) causes shipping less value: latitude is higher, the freezing period is long, there is ice in the basin. The phenomenon of economy, population, traffic, river shipping is of little value. The river hydrological characteristic analysis model Water level: (height and variation) depend on River supply type and water conservancy project and lake regulation function; Flow rate: (size and seasonal variation depend on precipitation characteristics and basin size); Sediment content: (depends on the vegetation condition in the interior of the basin); The freezing period: (or not depends on the length of the coldest month temperature); Status of water resources: (depending on the topography and climate characteristics of the river basin) Example: Xinjiang inland rivers (Tarim River) hydrological characteristics: multi River, short rivers and tributaries; the flow of small, many seasonal rivers (winter break), mainly supplied by glacier meltwater. The water in the southwest of China is rich, the main reason is: located in humid areas, abundant rainfall, runof