[题目]下图为我国山西省某地区示意图.据图回答下列问题:(1)若大气降水降落在P点后形成坡面径流.请在图中画出P点的径流方向.(2)Q地区建成一座水电站.蓄水位保持在海拔900米.水库蓄水后的回水淹没的干流河段大约是千米.(3)当地政府大力提倡植树造林.a河.b河流域采取了不同的植树造林模式.判断能够产生更大环境效益的模式并叙述其理由.(4)从� 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】下图为我国山西省某地区示意图。据图回答下列问题：

（1）若大气降水降落在P点后形成坡面径流，请在图中画出P点的径流方向。

（2）Q地区建成一座水电站，蓄水位保持在海拔900米，水库蓄水后的回水淹没的干流河段大约是千米。

（3）当地政府大力提倡植树造林，a河、b河流域采取了不同的植树造林模式（如图a，图b）。判断能够产生更大环境效益的模式并叙述其理由。

（4）从促进该地区经济发展来看，Q城市今后更有利于哪些产业部门的发展？

【答案】

（1）垂直于等高线指向低处

（2）75千米

（3）b b河流域绿化带平行于等高线与坡面径流方向垂直，因而涵养水源保持水上的作用更大一些。（4）铝产品加工、铝矿开采、炼铝、化工、旅游、养殖

【解析】

试题分析：

（1）若大气降水降落在P点后形成坡面径流，水往低处流。

（2）根据线段式比例尺知道，图上1厘米表示实地距离50千米，量算到干流Q地到900米等高线的图上距离为1.5厘米，则水电站蓄水位保持在海拔900米，水库蓄水后的回水淹没的干流河段大约是75千米。

（3）从图中考查得知，b河流域绿化带平行于等高线与坡面径流方向垂直，因而涵养水源保持水土的作用更大一些，因此b模式能够产生更大环境效益。

（4）从图中可以看出，Q城市附近铝土资源丰富，水能资源丰富，城市兴起的主要区位因素应是自然资源的开发，从促进该地区经济发展来看，今后更有利于铝产品加工、铝矿开采等产业部门的发展。

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