河床
2014-03-06 00:00:00
阅读数:
<p>
<span style="line-height:2;font-family:SimSun;font-size:14px;"> 底部河水经常流动的地方称为河床。河床由于受侧向侵</span><span style="line-height:2;font-family:SimSun;font-size:14px;">蚀作用而弯曲,经常改变河道位置,所以河床底部冲积物复杂</span><span style="line-height:2;font-family:SimSun;font-size:14px;">多变,一般来说山区河流河床底部大多为坚硬岩石或大颗粒岩</span><span style="line-height:2;font-family:SimSun;font-size:14px;">石、卵石以及由于侧面侵蚀带来的大量的细小颗粒。平原区河</span><span style="line-height:2;font-family:SimSun;font-size:14px;">流的河床一般是由河流自身堆积的细颗粒物质组成,黄河就是</span><span style="line-height:2;font-family:SimSun;font-size:14px;">一个例子。</span>
</p>
<p align="center">
<img width="598" height="297" alt="" src="/public/html_images/20140306/20140306224020_974.png" />
</p>
<p align="center">
<span style="line-height:2;font-family:SimSun;font-size:14px;">黄河兰州段裸露的河床<span id="__kindeditor_bookmark_end_46__"></span></span>
</p>
<p>
</p>
<span style="line-height:2;font-family:SimSun;font-size:14px;"></span>