Erosional features in Ylaruam
by RobinThere has been serious erosion indeed.
Looking at the Mogreth rivers flowin Zigzag through the valley, I have estimated Heights as per Hang and Fall of the rivers, and the Debiet using the rivers course/length acordingly, Yet there is a major difference to later Ylaruam and Nithian eras.
First the Issus river enter the hills North of Future Karameikos, then flows through these hills, leaving the hills northwards towards Mount Odharjakull, then south again....only 1.5 8 mile hexes away from the higher part of the Issus river., then flowing east andf eventually into the delta later becomming the Emirate of Abbasshan.
We have several aspects of the area;
The Wall of ice itself; ( two 8 mile hexes=16 miles in thickness, and estimated several hundred of yards high—this estimate is generated from the canon Rockhome maps, the altitude of the 1000AC lakes and the estimated altitude in correspondance with the mountains of a 200 to 300 yards higher). Estimated Fall; , Estimated Hang:
Clutched between the mountains of future rockhome is a lake of combined melting water of the glacier which originated partially before the GroF and partially after the GroF due planetary tilt and temerature/climatolical changes as described in canon and fanon (maps especially). The wall of ice is thus actually a glacier clutches in the path of several hundreds of yards thick/high enabling to imprison the water behind it. This scenario of doom already predicts a major upcoming disaster. Water heats easier than ice, yet ice melts easier in water than in air. The water locked behind the giant glacier will slowly invade the ice, while the sun also slowly melts the ice, creating a minor origin source of the river. If one glacier creates a river, another nearby can’t be NOT melting, that is the logic of the river’s source/climate.
When the water succesfully permeated itself through the Glacier, it will create a flow, this flow will increase due pressure and speed of the water and the corresponding erosion of the ice it passes. This will eventually culminate in a greater passage, and destruction of the glacier, resulting in a REALLY almost biblical floodwave washing down Mogreth. The impact will instantly erode the northwesternside of the Mogreth Valley, like water pouring on a pile of sand.
The river from Wall of ice to Ylanazhat; (19 8mile hexes mapped in the valley and an additional suggested 1.5 8mile hexes unmapped from the icewall as described above for a total distance of 152 miles and 12 mils suggested=164 miles if river flowing down from the icewall.) Estimated Fall; 984, Estimated Average Hang: 0.006meter/meter
The river is labelled here as originating from the mountains, yet surely had to also originate from the wall of ice in the North as described above. The mountain based origin of the river also seems to spring from Glaciers, so there is melting, severe melting actually enough to create a river. This gives proof that the wall of ice on itself also must suffer melting. Something John Calvin’s Mogreth Map did not take into account….There must have been a ice wall source contributing to the river, even if it is minor.
When the giant flood wave will pass with its greatest momentum, it will wash away anything it encounters. This includes several hundreds of feet of ground, which are washed away. Drowning any creature in the icicold water and dragged debris, depositing anything far downflow alongside and at the reaching of the sea.
The River from Ylanazhat through the hills till NW of future Kuznetz location; (18 8mile hexes meandering and cutting through the hills.) Estimated Fall; 864, Estimated Average Hang: 0.006meter/meter
The river passes through these hills. Which dictates that the area more upriver is higher. This means that the whole valley here is much higher than in the future, and is estimated as high as the Ylaruam cliffs …so to say the area was filled up. The river passes through the hills and then re-enters Central Mogreth.
When the icewall breaks the flood will partially follow the river, yet the erosion upflow of the floodwave caused will rapidly cut-off the river from its original higher source. What remains is a dried-out riverbed, which still must exist in these hills up to 1000AC+.
The altitude differences between the Ylanazhat location and the south must still exist and is significant). The mostly dried out riverbed becomes a Wadi, and is prone to mudstreams when rain does come.
The River from NW of future Kuznetz location to Curvature corner of the river where future Kuznetz eventually will come to be. (36 8mile hexes for a total distance this riversection covers of roughly 288 miles=463.491,0.72 meters.) Calculated Estimated Fall; 606, Estimated Average Hang: 0.004meter/meter
Actually, the Issus River originating in the NW, goes around a higher region in Ylaruam to be called the Valley of Death. The rocky desert hexes here in the Ylari hex, as well as the forest in this location in the Mogreth Map suggest this being a fertile hill. The Western Part of the Issus River is depcted as less wide than where it meets the Rishek River, and continue as a wider Issus from the location of Future Tel Al Kebir.
The distance between the location NW of future Kuznetz and the Future Kuznetz location is very small, the length of the singular river uses gives proof through the Hang(Height/distance) of the river that is significant. This thus proofs that there is a obstruction significant in size to allow the Fall of the river to be.As we speak here of an area of 1.5 8mile hexes in width, and the Mogreth map already uses hills somewhat NE and W, it is best to suggest that this barrier is also a sturdy hill.
When the flood wave passes over this area the erosion of the Hills and the forested higher area west will slow down the strength of the wave, decrease erosion, causing deposits North and South and further down stream. The hills will be almost totally be eroded away, allowing the ‘new’ Nithia river after the disaster, to flow generally eastwards, south-eastwards as the Nithia period maps give.
The river from Future Kuznetz to begin of the Delta, SW of Future Abbashan (22 8mile hexes for a total distance of roughly 176 miles =283.244,544 meters) Calculated Estimated Fall;200 , Estimated Average Hang: 0,003meter/meter. This area passes through various hills, and mostly follows the line of the future cliffs of the region. It can thus be assumed, these future cliffs(as per canon map Ylaruam) did originate from this era and this river, and were only enhanced by the flood.
When the flood comes, the hills will further reduce the speed and strength of the wave, and decrease erosion effects, and what is eroded will be deposited sooner (depending on weight/size).
The River from of the Delta, SW of Future Abbashan to the sea (16 to 20 8mile hexes for a total distance of 128 miles in the middle of the delta to 160 miles for the sides) , Estimated Average Hang: 0,0015meter/meter. . This area was a low marshlands area enwrapped in forests on the northern and southern sides.
When the floodwave hits the area most of the debris taken with the wave will be deposited in this region, while the force of the wave destroys all vegetation and most settlements when it hits the sea. Isshum, Ssugath will be destroyed, and only stone segments will remain. The far eastern settlements Burrup’ket, Urrug’gat and any other plant-based settlements the lizardkind creatures pregferred to use, were flooded away, and nothing will remain, other than sunken, mostly pottery and tools covered by layers of sand and debris.
There is another cliff in the Ylaruam canon map along the sea, this is later erosion and deposits in the Nithian era and the waves caused erosion and deposit by the sinking disaster of 1700-1750BC.
Combining all this information, there isonly one issue on the canon map I see as flawed, and that is the depth of the waters. With the removal of several thousands of square mile and many feet high original land, it must have been placed normally in the sea. The disaster of 1700-1750BC may have removed much of it, yet I conclude much of it should remain, and then visible as a lowe depth area.
Of course I still have to do the Nithian overlay, and this will further detail the geological effects in the area, yet even this single combination map gave lots and lots of information,.
The calculations I made are based on the fact that the Hang is Fall divided by length flow. I reversed this calculation by setting the average Hang over the river sections accordingly and these estimates are based on global estimates of similar regions. Of course there are minor differences as the Debiet can chage depending on the location (river width, depth, angle, obstructions, etc) and Reqiem, yet hence why I use averages.
Average Hang-River Erosion Table
At least the calculated Hang can be used to differentiate the various altitudes in the Mogreth nEra, and hence many of the Nithian and even canon Ylari era.
High Mountains(1500+m, 4921+feet) have an average High Hang (25m/1000m) and has only erosion, and nearly no sedimentation/deposits.
Middle Mountains(750-1000m, 2460-3282feet) have an average Medium High Hang (13m/1000m=1.3%) and has mostly erosion, and minor sedimentation/deposits.
Low Mountains (500-750m, 1641-2460feet) have an average Medium Hang (7m/1000m=0.7%) and has medium erosion, and medium sedimentation/deposits.
Hillands (200-500m, 657-1641feet) have an average Low Hang (3,5m/1000m=0.35%) and has Medium Low erosion, and Medium High sedimentation/deposits.
Lowlands (0-200m, 0=657feet) have an average Small Hang (1,7m/1000m=0.17%) and has Low erosion, and High sedimentation/deposits.
Delta areas have an average Small Hang (less than 1,7m/1000m=less than 0.17%) and has Low erosion, and very High sedimentation/deposits, causing continuously course directions of the flow.
Average Hang of a significant river (begin to end) has an average Hang of 4m/1000m=0.4%, yet this will of course vary greatly per river dependng on terrain.It is however a good estimate to begin calculation.
Explanation of Terms used above
1 mile =1609,344 meter, 100 meter =328,299 feet,100 feet=30.46m
Fall is the difference of altitude between two locations
Hang is Fall divided by length flow, also described as % of mm/m (or m/1000m); example; 0.5%-5mm/m
Debiet is amount of water per time tough an area m3/s. A Debiet of 1.5m/s moves Gravel(example middle Rhine), 3m/s moves sand (example Lower Rhine), 0.1m/s moves silt (Example Maas)
Area where Hang is lower than 2m/1000m sedimentation will continuosly influence area/rive course and spread outwartds forming a delta
Regiem= fluctuation by season/humanoid influences(dams etc)
Wadi is dried out bed, difficult to hold water, higher chance mudstream
Informative Links
One of biggest tsunamis ever recorded was set off in Alaska by a melting glacier
This picture awfully resembles the Ylari Bassin area, still flooded, only a day or so after the flood's initial impact.
and here an image resembling the flood itself
