Author(s): Hyeonjun Kim; Cheol-Hee Jang; Ilpyo Hong
Linked Author(s):
Keywords: Urban flood; Chugugi; Cheonggyecheon; HEC-HMS; HEC-RAS
Abstract: In 1441, the world’s first rain gauge called “Chugugi” was invented and nationwide monitoring system was established. The rainfall records from A.D. 1770 was restored. The Joseon Dynasty was suffered from extreme floods and the details of damage were described in the historical document, the Annals of Joseon Dynasty. In this study, the extreme floods which occurred in the capital city, Cheonggyecheon urban river, were selected to analysis flood quantity and flood level using modern hydrologic and hydraulic simulation models. We applied the HEC-HMS model for the design flood using rainfall data measured by Chugugi and calculated the flood levels and inundated area by HEC-RAS 1-D flood simulation model. Ten extreme flood events after 1770 and the records of damage were compared with rainfall records. On July 16, 1885, the daily rainfall was 392 mm and it was estimated more than 50 year’s flood frequency in modern flood design criteria. The flood peak was calculated with 340 m³/sec, flooding depth was over 0.7 m, and flooding area was larger than 3.4 km². In the historical document, 520 houses were swept away caused by the flood on July 16, 1885. The historical document and rainfall data measured by Chugugi can be utilized to understand ancient floods.
Year: 2018