## 4 Digital Platform--DNS/SWAT--New Modules
### AdH/Ptm  
The SWAT module made it possible to simulate suspended sediment load transport in the analyzed Raba River basin, maintaining the continuity of this process between the upper and lower part of the basin, by taking into account the dam reservoir. So, it was possible to estimate the suspended sediment load both before and after the reservoir.  
Figure 3: Comparison of the simulation to the observed results for the calculation profile of Myslenice and Proszowki for flow and suspended sediment.  
However, this tool could not show the sequencing of sedimentation in the tank itself, divided into zones where this process occurs with varying intensity depending on the period and size of sediment particles [41]. Therefore, for this purpose, the AdH/PTM model was used, which was previously built and verified by the method of comparative analysis with real data [144; 145]. AdH is a two-dimensional hydrodynamic modeling tool that uses the finite element method to solve two-dimensional equations of momentum conservation for water in the Euler system. On this basis, the particles' behavior over time (entrainment, advection, diffusion, settling, deposition, burying, etc.) was simulated using the PTM module. At each time step, PTM performs calculations to determine the local characteristics of the environment and the behavior of each representative particle tracked. Their combination with the SWAT module on the DNS platform allowed for precise tracking of particles of individual suspended sediment fractions from their source, through transport, and ultimately their sedimentation in each of the four zones of the dam reservoir with a monthly time step [146]. The input data for the AdH/PTP module were the SWAT simulation results for the monthly mean values of the suspended sediments obtained in the previous study (Section 3.2). The functionality of the Kodoatile method was used to determine the size of the load of individual suspended sediment fractions (mineral: CLAY--0-0.004 mm; SILT--0.004-0.062 mm, and mineral/organic: SMAG--0.03 mm) flowing to the Dobczyc dam reservoir (Myslenice calculation profile), amounting to 1.11 t/m, 96.7 t/m, and 455 t/m, respectively. These particle masses of the individual fractions were characterized by essentially different deposition sites in the reservoir. In the case of SMAG, the highest percentage of particles belonging to this fraction was deposited in the summer months (June, July, and August) in the backwater zone and the Myslenice basin (from 26 to 47%, and 52 to even 70%, respectively). In the case of the SILT fraction, most of these particles were deposited in the first two zones; however, seasonality had a large impact on this process (river--from 42 to 71%, and backwater--from 27 to 48%). In the case of CLAY, a similar seasonal pattern was observed, but most of these particles were deposited in the backwater zone and the Myslenice basin (23-47% and 30-40%, respectively). However, most important were the results concerning the particles of this fraction reaching the dam itself, and further to the lower part of the basin (even from 46 to 60%). This poses a direct threat to, e.g., drinking water, the intake of which is located in the last zone of the dam reservoir. The described results, together with their seasonal changes, can be analyzed in detail for each fraction in the developed graphical database [147].