| 词条 | Mountain river |
| 释义 |
A mountain river is a river that runs usually in mountains, in narrow, deep valley with steep banks, rocky stream bed, and accumulated rock debris. Mountain rivers are characterized by high slope and flow velocity, insignificant depth, frequent rapids and waterfalls, as well as dominated washed out processes. The gradient of a mountain river is calculated at 60–80 m/km in upper stream and 5–10 m/km in lower. More precisely it is greater than or equal to 0.002 m/m along most of its stream length. Speed of stream is measured at 1 to 4.5 m/s and higher. Mountain rivers have significant hydro energy producing potential and in arid conditions often used for irrigation. See also
Bibliography
External links
4 : Rivers|Bodies of water|Limnology|Mountains |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。