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Fig. 2. The vertical soil profile at GP2, where the suction cups and gas samplers were located (• and 
, respectively). The figure indicates the location of the water and gas samplers in relation to the soil structure. The numbers of the suction cups are indicated on the figure. TFS, topset unit, fine sand; TCS, topset unit, coarse sand; FFS, foreset unit, fine sand; FCS, foreset unit, coarse sand; FSS, foreset bed, silty sand. The location of the TDR probes (thick, vertical lines), the walls of the trench (thin, vertical lines), the application line, and the width of the trench are indicated on the figure. Only the segments of the TDR probes that were working are shown. The local coordinate system uses the southeastern corner of the trench as the point of origin.
