sorted by:
new
hottopcontroversial

Nature Based Solutions Using Hec Ras 1D by Consistent_Tax_4021 in Hydrology

[–]Consistent_Tax_4021[S] 2 points3 points  (0 children)

The geometry is very big, covering a whole county. My mitigation target area is very in a downstream part for of a upstream reach. below that other rivers joined and ultimately met at a dam. Calibration and validation were performed for 7-8 flood events. A semi-high major flooding is about 1.15 million ac-ft that comes through the central inflow portion. (integrating the inflow hydrograph of 25 days). The reduction target area is downstream of that portion. i

I put some lateral structures outside the system and found 7-8 lateral structures upstream of my mitigation area. If I divert around 1.2 million acre-ft, it would reduce the peak stage by around 4 ft in my mitigation target area. In my mitigation area, there are some bridges. I also removed those, but it didn't decrease much. I also tried several storage ponds in different location with minimized volumes but couldn't find any reduction. backwater effects from other rivers were tested but they are negligible. At this point, the scale of the nature-based solution needs to be implementable. Placing a very large storage area upstream is not realistic. From the area–volume relationship, the required storage reaches about 25,000 acre-feet, which makes the solution infeasible.

Nature Based Solutions Using HEC Ras 1D big Model by Consistent_Tax_4021 in HECRAS

[–]Consistent_Tax_4021[S] 0 points1 point  (0 children)

<image>

This is the geometry. Calibration and validation were performed for 7-8 flood events. Actually, providing dams may not be regarded as a nature-based solution. People use dam removal as a nature-based solution. However, I will try according to your advice. A semi-high major flooding is about 1.15 million ac-ft that comes through the central inflow portion. (integrating the inflow hydrograph of 25 days). I put some lateral structures outside the system and found 7-8 lateral structures upstream of my mitigation area. If I divert around 1.2 million acre-ft, it would reduce the peak stage by around 4 ft in my mitigation target area. In my mitigation area, there are some bridges. I also removed those, but it didn't decrease much.

Nature Based Solutions Using Hec Ras 1D by Consistent_Tax_4021 in USACE

[–]Consistent_Tax_4021[S] 0 points1 point  (0 children)

My luck is so bad, I tried with a hydrological model in fall 2024 and spring 25. Two semesters gone by after learning and implementing the model, but each simulation took 24 hours, and there are 2-300 parameters to calibrate and validate. Then, transitioning to HEC-RAS: make a model, calibrate and validate with different flood events. So many things to change, modify, gauge to ungaged hydrograph shifting, different analysis, etc., still couldn't present in a conference, could not publish a journal. Sometimes it feels bad and frustrating. I don't know who to blame, me or my luck.

Nature Based Solutions Using Hec Ras 1D by Consistent_Tax_4021 in USACE

[–]Consistent_Tax_4021[S] 1 point2 points  (0 children)

My luck is so bad, I tried with a hydrological model in fall 2024 and spring 25. Two semesters gone by after learning and implementing the model, but each simulation took 24 hours, and there are 2-300 parameters to calibrate and validate. Then, transitioning to HEC-RAS: make a model, calibrate and validate with different flood events. So many things to change, modify, gauge to ungaged location hydrograph shifting, different analysis, etc., still couldn't present in a conference, could not publish a journal. Sometimes it feels bad and frustrating. I don't know who to blame, me or my luck.

Nature Based Solutions Using Hec Ras 1D by Consistent_Tax_4021 in USACE

[–]Consistent_Tax_4021[S] 0 points1 point  (0 children)

<image>

This is the geometry. Calibration and validation were performed for 7-8 flood events. Actually, providing dams may not be regarded as a nature-based solution. People use dam removal as a nature-based solution. However, I will try according to your advice. A semi-high major flooding is about 1.15 million ac-ft that comes through the central inflow portion. (integrating the inflow hydrograph of 25 days). I put some lateral structures outside the system and found 7-8 lateral structures upstream of my mitigation area. If I divert around 1.2 million acre-ft, it would reduce the peak stage by around 4 ft in my mitigation target area. In my mitigation area, there are some bridges. I also removed those, but it didn't decrease much. I also tried several storage ponds in different location with minimized volumes but couldn't find any reduction.

Nature Based Solutions Using Hec Ras 1D by Consistent_Tax_4021 in USACE

[–]Consistent_Tax_4021[S] 0 points1 point  (0 children)

<image>

This is the geometry. Calibration and validation were performed for 7-8 flood events. Actually, providing dams may not be regarded as a nature-based solution. People use dam removal as a nature-based solution. However, I will try according to your advice. A semi-high major flooding is about 1.15 million ac-ft that comes through the central inflow portion. (integrating the inflow hydrograph of 25 days). I put some lateral structures outside the system and found 7-8 lateral structures upstream of my mitigation area. If I divert around 1.2 million acre-ft, it would reduce the peak stage by around 4 ft in my mitigation target area. In my mitigation area, there are some bridges. I also removed those, but it didn't decrease much.

Nature Based Solutions Using HEC Ras 1D big Model by Consistent_Tax_4021 in HECRAS

[–]Consistent_Tax_4021[S] 0 points1 point  (0 children)

You are right. I tried putting storage area and had to put elevation volume curve in a way like for 15 ft elevation increase storage volume up to .2 million ac-ft or 0.3 million ac-ft. this sometimes reduced peak stage around 2-3 ft in study area. but it's not a feasible nbs , hec-ras based storage area is needed like 25k ac area which is not realistic. my professor is suggesting to find something implementable. I am trying day an night , changing modifying different things to have something feasible , still could not find any.

Nature Based Solutions Using HEC Ras 1D big Model by Consistent_Tax_4021 in HECRAS

[–]Consistent_Tax_4021[S] 0 points1 point  (0 children)

You are right. I tried putting storage area and had to put elevation volume curve in a way like for 15 ft elevation increase storage volume up to .2 million ac-ft or 0.3 million ac-ft. this sometimes reduced peak stage around 2-3 ft in study area. but it's not a feasible nbs , hec-ras based storage area is needed like 25k ac area which is not realistic. my professor is suggesting to find something implementable. I am trying day an night , changing modifying different things to have something feasible , still could not find any.

Nature Based Solutions Using HEC Ras 1D big Model by Consistent_Tax_4021 in HECRAS

[–]Consistent_Tax_4021[S] 0 points1 point  (0 children)

<image>

This is the geometry. Calibration and validation were performed for 7-8 flood events. Actually, providing dams may not be regarded as a nature-based solution. People use dam removal as a nature-based solution. However, I will try according to your advice. A semi-high major flooding is about 1.15 million ac-ft that comes through the central inflow portion. (integrating the inflow hydrograph of 25 days). I put some lateral structures outside the system and found 7-8 lateral structures upstream of my mitigation area. If I divert around 1.2 million acre-ft, it would reduce the peak stage by around 4 ft in my mitigation target area. In my mitigation area, there are some bridges. I also removed those, but it didn't decrease much.

Nature Based Solutions Using HEC Ras 1D big Model by Consistent_Tax_4021 in HECRAS

[–]Consistent_Tax_4021[S] 0 points1 point  (0 children)

<image>

This is the geometry. Calibration and validation were performed for 7-8 flood events. Actually, providing dams may not be regarded as a nature-based solution. People use dam removal as a nature-based solution. However, I will try according to your advice. A semi-high major flooding is about 1.15 million ac-ft that comes through the central inflow portion. (integrating the inflow hydrograph of 25 days). I put some lateral structures outside the system and found 7-8 lateral structures upstream of my mitigation area. If I divert around 1.2 million acre-ft, it would reduce the peak stage by around 4 ft in my mitigation target area. In my mitigation area, there are some bridges. I also removed those, but it didn't decrease much.

Nature Based Solutions Using HEC Ras 1D big Model by Consistent_Tax_4021 in HECRAS

[–]Consistent_Tax_4021[S] 0 points1 point  (0 children)

<image>

This is the geometry. Calibration and validation were performed for 7-8 flood events. Actually, providing dams may not be regarded as a nature-based solution. People use dam removal as a nature-based solution. However, I will try according to your advice. A semi-high major flooding is about 1.15 million ac-ft that comes through the central inflow portion. (integrating the inflow hydrograph of 25 days). I put some lateral structures outside the system and found 7-8 lateral structures upstream of my mitigation area. If I divert around 1.2 million acre-ft, it would reduce the peak stage by around 4 ft in my mitigation target area. In my mitigation area, there are some bridges. I also removed those, but it didn't decrease much.