Study on the structure of multi-layer water circulation system in the core scenic spot of Huanglong

In order to find out the water circulation process and water circulation system structure in the travertine layer in the core scenic spot of Huanglong， Sichuan，in this paper， the methods of surveys and water circulation section monitoring were adopted to analyze the composition of groundwater runoff flow and surface water flow，which are formed from secondary conversion spring， in monitoring section and the characteristics of recharge and discharge in the circulation section，so as to obtain the development scale and level of each water circulation system. According to the 2019 survey results and data analysis of 16 water monitoring stations， the results showed that the structure of water circulation system is the most complex during the wet season， and it is divided into three levels of regional circulation， local circulation and site circulation， with the local circulation as the main in scale. Taking July as a typical month， the water circulation in the scenic spot is mainly controlled by four local groundwater circulation systems developed in series. The regional groundwater circulation system developed in the north area of Jiexian bridge. The Chongshuicai pools between each circulation sections were the recharge areas， and the outlet was secondary conversion calcareous spring with large flow. Groundwater flows in the travertine layer and the bottom and both sides of the layer are water-proof boundaries. There are 5 site water circulation systems in the south of Zhengyan pool. The dynamics changes of the water circulation system structure in the scenic spot are great， and it reached the dynamic equilibrium state only in wet season. The surface water and underground water of Huanglong stream constitute all the water volume that drives the development of the water circulation system in the core scenic spot，and the water in the scenic area is completely discharged in Jiexian bridge and the right bank of Fujiang. The water circulation in the core scenic area of Huanglong reaches a dynamic balance during the wet season， while which is in an unstable flow state in other periods.