丹江口水库浸没区判别方法及浸没程度评价

Judgment method and inundation degree evaluation for inundation area of Danjiangkou Reservoir

丹江口水库大坝加高后,其正常蓄水位附近分布的Ⅱ级阶地及其他平缓地段存在浸没问题,给当地农作物及建筑物带来危害。以浸没区基本特征为判断依据,在对水库浸没区进行初步判别和复判后,根据测区水文地质条件确定了产生浸没的临界地下水位,针对不同的地层结构确定了地下回水位的预测原则,并对浸没程度进行分级。选取典型浸没区进行了浸没评价,提出对浸没轻微地区采取排水减压措施,对浸没中等地区采取排水减压与改换农作物品种等措施,对浸没严重地区可采用彻底、可靠的压渗填高复垦方案,以降低浸没的影响。

Taking the characteristics of inundation area of Danjiangkou Reservoir as judgment basis,we perform re-judgment for the inundation area after preliminary judgment.The critical groundwater level depth is decided by hydrological geological condition in the measured area,the prediction principles of backed-up groundwater level are determined according to structures of different strata,and the inundation degrees is classified.Typical inundation area is selected,and we also propose some measures to reduce the influences of inundation,such as drainage for decompression in slightly inundated areas,drainage for decompression and replacement of crop varieties in medium-inundated areas and pressure-infiltration fill for reclamation in seriously inundated areas.