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一、河北高速公路所处的自然环境河北省背倚太行,面临渤海,北界内蒙、南连鲁、豫,山河纵横,沃野千里,地理及气候条件极为复杂。西北部群山入云,中南部平原广阔。冀北高原最低温度可达零下42度,而冀中平原却能出现40度的高温天气。由于地势和区域气候的影响,降雨差异也很大。燕山东麓年降雨量可达700～900毫米,而在冀西北黄土沟壑年降雨量不足400毫米。太行山区开发较早,植被稀疏,土壤瘠薄,水土流失严重。而冀北山区却由于历史的原因,
First, the natural environment of Hebei highway Hebei Province back Taihang, facing the Bohai Sea, Inner Mongolia north, north and Shandong, Henan, rivers and lakes, fertile land, geographical and climatic conditions are extremely complicated. The northwestern mountains into the clouds, the vast central and southern plains. The lowest temperature in Hebei plateau reaches minus 42 degrees, while the Jizhong plain can appear 40 degrees in the hot weather. Due to the influence of topography and regional climate, the difference in rainfall is also large. Yanshan Donglu annual rainfall up to 700 ~ 900 mm, while in the northwestern Hebei Loess Gully rainfall less than 400 mm. Taihang Mountains developed earlier, sparse vegetation, soil infertility, serious soil erosion. However, due to historical reasons,