268
C. Trifanov et al.
• SR_100 m_95%: the inclusion of the area suitable for renaturation, the width of
the food threshold of 100 m, and its height to a value representing 95% of the
Danube’s maximum water level;
• SR_100 m_90%: the inclusion of the area suitable for renaturation, the width of
the food threshold of 100 m, and its height to a value representing 90% of the
Danube’s maximum water level;
• SR_50m_95%: the inclusion of the area suitable for renaturation, the width of the
food threshold of 50 m, and its height to a value representing 95% of the Danube’s
maximum water level;
• SR_50m_90%: the inclusion of the area suitable for renaturation, the width of the
food threshold of 50 m, and its height to a value representing 90% of the Danube’s
maximum water level.
8.3.3 The Hydrographical Danube River Plan
The hydrological scenarios were designed to quantify the decrease of the Danube
water level:
• Renaturing of some agricultural polders;
• Use of some agricultural polders for water storage in case of high Danube water
level;
• Combined scenarios (renaturing and water storage for some agricultural polders).
The hydraulic layout of the renatured agricultural polders was made by including
in the cross-section of the Danube the cross section corresponding to the analyzed
agricultural polder (Fig. 8.17). To be able to sketch the water storage in the agricultural
polders was used a global methodology for removing from the hydrological balance
of the water storage flow corresponding to each polder (Fig. 8.18).
In the present study, was used the “Overland flow” module of the Sobek 1D, 2D
hydraulic modeling software. This module allows 2D modeling of hydrological flood
scenarios to be integrated in 1D hydraulic modeling (Fig. 8.19).
The connection channel between the Danube and the agricultural polder can be
considered as a threshold in the magistral dam, which allows the flood of the agricultural polder when the Danube level exceeds its quota. Hydrological scenarios were
made for several variants of the threshold width, 50 and 100 m, and the threshold
height was calculated for a value representing 95 and 90% of the maximum value of
the Danube level in 2006. The positioning of the flood thresholds was set upstream
for each agricultural polder in front of the old lakes connected to the Danube or
to make a connection to the irrigation channels (Figs. 8.19 and 8.20). Hydrological
scenarios were run for representative hydrological regimes of the Danube, namely:
2003 (minimum levels), 2004 (average levels) and 2006 (maximum levels).
C. Trifanov et al.
• SR_100 m_95%: the inclusion of the area suitable for renaturation, the width of
the food threshold of 100 m, and its height to a value representing 95% of the
Danube’s maximum water level;
• SR_100 m_90%: the inclusion of the area suitable for renaturation, the width of
the food threshold of 100 m, and its height to a value representing 90% of the
Danube’s maximum water level;
• SR_50m_95%: the inclusion of the area suitable for renaturation, the width of the
food threshold of 50 m, and its height to a value representing 95% of the Danube’s
maximum water level;
• SR_50m_90%: the inclusion of the area suitable for renaturation, the width of the
food threshold of 50 m, and its height to a value representing 90% of the Danube’s
maximum water level.
8.3.3 The Hydrographical Danube River Plan
The hydrological scenarios were designed to quantify the decrease of the Danube
water level:
• Renaturing of some agricultural polders;
• Use of some agricultural polders for water storage in case of high Danube water
level;
• Combined scenarios (renaturing and water storage for some agricultural polders).
The hydraulic layout of the renatured agricultural polders was made by including
in the cross-section of the Danube the cross section corresponding to the analyzed
agricultural polder (Fig. 8.17). To be able to sketch the water storage in the agricultural
polders was used a global methodology for removing from the hydrological balance
of the water storage flow corresponding to each polder (Fig. 8.18).
In the present study, was used the “Overland flow” module of the Sobek 1D, 2D
hydraulic modeling software. This module allows 2D modeling of hydrological flood
scenarios to be integrated in 1D hydraulic modeling (Fig. 8.19).
The connection channel between the Danube and the agricultural polder can be
considered as a threshold in the magistral dam, which allows the flood of the agricultural polder when the Danube level exceeds its quota. Hydrological scenarios were
made for several variants of the threshold width, 50 and 100 m, and the threshold
height was calculated for a value representing 95 and 90% of the maximum value of
the Danube level in 2006. The positioning of the flood thresholds was set upstream
for each agricultural polder in front of the old lakes connected to the Danube or
to make a connection to the irrigation channels (Figs. 8.19 and 8.20). Hydrological
scenarios were run for representative hydrological regimes of the Danube, namely:
2003 (minimum levels), 2004 (average levels) and 2006 (maximum levels).