2.2 Flood wave scenarios
Due to seasonal flood events and reservoir operations, the stage of the Inbuk Stream at the investigation site fluctuates approximately sinusoidally, with the maximum amplitude and duration reaching 1 m and 10 d, respectively (Liu et al., 2019). To better understand the stream-aquifer water exchanges driven by different flood wave parameters, a variety of flood wave scenarios were designed (black square frame in Fig. 2). To accomplish this, the values of A ,T , r and t p were varied, and the range of each parameter was roughly determined by the stream stage measurements obtained between 2014 and 2016.
Additionally, a variety of flood waves of different T /Aand N were envisaged (red square frame in Fig. 2) by assuming CUFV condition, saying keep the integral of flow discharge overtime in the upstream of the investigation site constant. The cross-section discharge is an exponential function (exponent = 8/3) of the corresponding water depth (Liu et al., 2019); however, in this study we established a linear relationship (i.e. exponent = 1) between the cross-section discharge somewhere in the upstream of the site and the water depth at the specific site. Through this way, we could design different flood waves under CUFV condition by controlling the integral of the flood wave over time at the site.