Page 84 - 2021年第52卷第9期

Spatial and temporal characteristics and influencing factors of water age in Poyang Lake

HUANG Aiping，LIU Xiaobo，PENG Wenqi，DONG Fei，HAN Zhen，WANG Weijie
（Department of Water Ecology and Environment China Institute of Water Resources and Hydropower Research，Beijing 100038，China）

Abstract：Water exchange capacity is a key index to characterize the hydrodynamic and pollutant transport
and diffusion of lakes. The hydrological regime of Poyang Lake fluctuates violently，and the spatial and tem⁃
poral characteristics and influencing factors of water exchange capacity are complex. In this paper， water
age is selected to describe the water exchange capacity of Poyang Lake， and the water age model of Poy⁃
ang Lake is established. The temporal and spatial characteristics and influencing factors of water age are
studied，and the response law of water age to the evolution of River-Lake relationship is analyzed. The re⁃
sults show that：（1） the water age of Poyang Lake has significant temporal and spatial heterogeneity. The
water age in summer and autumn is significantly longer than that in winter and spring，and the water age
in inner lake and bay area is significantly longer than that in main river channel and beach. （2） The wa⁃
ter level at Hukou and the inflow of the basin are the main factors affecting the water age of Poyang Lake.
The influence of the water level at Hukou on the water age of Poyang Lake is greater than that of the ba⁃
sin inflow； the higher the water level at Hukou， the longer the water age of Poyang Lake， while the in⁃
flow of the basin is the opposite； the main reason for the drastic fluctuation of the water age of Poyang
Lake is the drastic change of the water level at Hukou. （3） After 2003， with the evolution of the Riv⁃
er-Lake relationship， the water age of Poyang Lake decreases， especially in autumn. The research results
can provide scientific support for the protection of water resources of Poyang Lake，and also provide refer⁃
ence for the study of water exchange capacity of other large lakes.
Keywords： Poyang Lake； river-lake relationship； water age； temporal and spatial characteristics； influenc⁃
ing factors
（责任编辑 ：李福田）

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