Hongbo Ma
1.3K posts

Hongbo Ma
@sedimentdynamic
Associate Prof. @Tsinghua_Uni, China. Study sediment transport and geomorphology from land surface to seafloor.







5. Considering the similar urbanization process worldwide, i.e the pattern of the sync extraction-construction and a later restoration, this case provides a fair warning to (re)evaluate the earthquake risk of the region with recovering groundwater tables.

4. In this study, we used Beijing as a demonstration where the South-to-North Water Diversion Project (the world's largest)significantly recovered the previously low groundwater table. Its earthquake-induced liquefaction extent and severity has drastically increased

3. As groundwater restoration projects kick in, the shallower, rising groundwater table facilitates a granular phenomenon called soil liquefaction whereby shaking ground builds up excessive pore pressure in the saturated soil, which loosens grain contacts and their strength.

2. Together with urbanization, groundwater extraction is usually the first choice for the urban water supply, and its process syncs with the urbanization process. So, a large majority of urban structures were constructed on a lowering groundwater table

How can the restored groundwater table change the earthquake risk? Our work published at @NatureComms made the first cut on this issue. (shorturl.at/orgnj) In short, the restored groundwater table INCREASES earthquake-induced liquefaction extent and severity. Thread 1






