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江汉平原正持续沉降沉降速度每年5～10毫米据湖北省水文地质工程地质勘察院高级工程师朱干章介绍,江汉平原正在持续沉降,沉降速度为每年5到10毫米,且沉降速度有加大的趋势。朱干章介绍说,我国于上世纪50年代、70年代、90年代对这一地区进了三次国家精密水准测量,但测算出的沉降速度没有现在这样快,为5毫米左右。测量显示,这一地区不是均匀的整体沉降,不同地点沉降速度不一,对某一地点的对比测量显示50年来已沉降了20多厘米,有的地点沉降幅度较小。而专家们还采用考古、同位素测定等方法测算,“第四纪”以来这一地区的地面沉降速度平均每年不
Jianghan Plain is continuously settling sedimentation rate of 5 ~ 10 mm per year According to Hubei Province Hydrogeological Engineering Geological Survey Institute senior engineer Zhu Qian Zhang introduction, Jianghan Plain is continuing to settle down, the settlement rate of 5 to 10 mm per year, and the settlement trend has increased. Zhu Qianzhang said that in the 1950s, 1970s and 1990s, China conducted three national precision leveling surveys in this area. However, the measured settlement rate was not as fast as 5 mm at present. Measurements show that the area is not uniformly subsided, and sedimentation rates vary from place to place. Comparative measurements of a place show that it has settled more than 20 centimeters over the past 50 years and that some areas have had less settlement. And experts also use archeology, isotope determination and other methods to measure the “Quaternary” since the average speed of land subsidence in the region each year