Journal of Geographical Sciences ›› 2019, Vol. 29 ›› Issue (3): 377-388.doi: 10.1007/s11442-019-1604-3

• Research Articles • Previous Articles     Next Articles

Estimating spatial pattern of hyporheic water exchange in slack water pool

Jinxi SONG1,2(), Dandong CHENG1,3, Junlong ZHANG2,4, Yongqiang ZHANG5, Yongqing LONG2, Yan ZHANG2, Weibo SHEN1   

  1. 1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, CAS & MWR, Yangling 712100, Shaanxi, China
    2. Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Sciences, Northwest University, Xi’an 710127, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
    4. College of Geography and Environment, Shandong Normal University, Jinan 250358, China
    5. CSIRO Land and Water, GPO Box 1666, ACTON 2601, Canberra, Australia
  • Received:2018-02-14 Accepted:2018-06-10 Online:2019-03-25 Published:2019-03-20
  • About author:

    Author: Song Jinxi (1971-), Professor, E-mail: jinxisong@nwu.edu.cn

  • Supported by:
    National Natural Science Foundation of China, No.51679200;No.51379175;Program for Key Science and Technology Innovation Team in Shaanxi Province, No.2014KCT-27;The Hundred Talents Program of the Chinese Academy of Sciences, No.A315021406;Specialized Research Fund for the Doctoral Program of Higher Education, No.20136101110001

Abstract:

Hyporheic zone (HZ) influences hydraulic and biogeochemical processes in and alongside streams, therefore, investigating the controlling geographic factors is beneficial for understanding the hydrological processes in HZ. Slack water pool (SWP) is an essential micro-topographic structure that has an impact on surface water and groundwater interactions in the HZ during and after high flows. However, only a few studies investigate HZ surface water and groundwater exchange in the SWP. This study used the thermal method to estimate the HZ water exchange in the SWP in a segment of the Weihe River in China during the winter season. The findings show that on the flow-direction parallel to the stream, river recharge dominates the HZ water exchange, while on the opposing flow-direction bank groundwater discharge dominates the water exchange. The water exchange in the opposing flow-direction bank is about 1.6 times of that in the flow-direction bank. The HZ water exchange is not only controlled by flow velocity but also the location and shape of the SWP. Great water exchange amount corresponds to the shape with more deformation. The maximum water exchange within the SWP is close to the river bank where the edge is relatively high. This study provides some guidelines for water resources management during flooding events.

Key words: hyporheic water exchange, thermal method, discharge, recharge, surface water-groundwater interactions