control reach的用法和样例：
例句
- Results show that the construction of the Fuling dock has a little influence on flood control and flow regime of the Fuling reach.
结果表明，修建涪陵港区码头对该河段的防洪及河势变化影响不大。 - This method is applied to generate the digital topography of river reach from Huayuankou to Lijin in the Lower Yellow River.
以黄河下游花园口至利津河段为例详述了黄河下游河道数字地形生成的原理及实现。
