The River Civilization Museum is situated on an alluvial island in the upper Yangtze River valley, Nan’an District, Chongqing. It covers a total land area of 59,968 m², with a total construction area of 19,152.87 m², including an underground construction area of 6,044.88 m². The plot ratio is 0.32 and the green space ratio is 61.42%. The building has one floor above ground and one floor underground, with a maximum height limited to 15 m. The project is designed and constructed in accordance with the Three-Star Green Building Standard and the requirements for Near-Zero Energy Consumption Design Certification.
Five man-made “high platforms” remain on the site, reflecting the topographical damage caused by early land leveling and quarrying. Based on the principles of “comprehensive protection, minimal development, and ingenious utilization”, the design adopts earth-covered structures and underground spaces as the primary means for terrain restoration, climate buffering, and functional integration, rather than treating them merely as protective or auxiliary spaces.
Climatically, Chongqing has a subtropical humid monsoon climate with hot summers and cold winters. The annual precipitation is approximately 1,000–1,350 mm, and the annual average relative humidity is 70%–80%. On the island, the annual average relative humidity rises to about 82%, with a calm wind frequency of about 47%. By extensively using earth-covered and semi-underground spaces to leverage the soil’s thermal stability and humidity-buffering effect, combined with river-water source heat pumps, natural ventilation, and intelligent operation and maintenance, the project achieves a 65.05% reduction in operational carbon emission intensity compared with the reference building, from 17.67 kgCO₂/(m²·a) to 6.18 kgCO₂/(m²·a). The building reduces carbon emissions by approximately 121.5 tonnes per year and about 6,430 tonnes over its entire life cycle. Underground spaces play an essential role in form, thermal performance, and structural foundation.