Fig. 9From: Effect of groundwater forced seepage on heat transfer characteristics of borehole heat exchangersSpatial hydrodynamic distribution in the fine sand layer at d = 120 d under the different total pumping–injection flow volume ∑G: a ∑G = 200 m3 d−1; b ∑G = 600 m3 d−1; c ∑G = 1200 m3 d−1Back to article page