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More from @rajbhagatt

Raj Bhagat P #Mapper4Life

@rajbhagatt

Feb 24

#Thread

What geographical features can we observe from the sky while on a flight from Thiruvananthapuram to Chennai? (approx path in map)

Equip yourselves with apps for more information from GPS.. Also notice the weaker signals from the satellites on the right side because I am sitting on the left side windows. Also preload maps in google maps so that you can identify features

In Thiruvananthapuram, we can notice a large sediment plume on the coast. This is largely around the Trivandrum Titanium Ltd

Read 27 tweets

Raj Bhagat P #Mapper4Life

@rajbhagatt

Jan 11

#Thread on #Tiruchendur erosion

Of recently, we might have come across the news that a lot of erosion has happened right next to the famous Murugan temple in Tiruchendur. In this thread of maps, I would discuss the causes and possible solutions

To provide context, this photo shows the area near the next to the temple which has eroded significantly and the beach used to extend further

#Satellite image shows the Tiruchendur coastline from last year in the month of January. The beach marked to the south of Murugan temple is the one facing erosion.

Read 20 tweets

Raj Bhagat P #Mapper4Life

@rajbhagatt

Oct 15, 2024

#Thread without Maps on #floods
If physical problems and solutions are known theoretically, then why are we not able to solve flooding situations in our cities whether it is Chennai or Bengaluru or Delhi?

There are 4 layers to the prob - Technical, Planning, Finance, Governance

Technical:
Our cities are not designed to take the rainfall that they face. The storm water drains are inadequate and the network is disconnected. Most of the drains are built in adhoc manner (if they are built). But why does this happen?

Cities don't have a storm water management plan. A plan that can comprehensively provide the technical details on the storm water network based on run off calculations, land etc is absent in most cases or poorly prepared in the remaining.
Why hasnt been it prepared?

Read 16 tweets

Raj Bhagat P #Mapper4Life

@rajbhagatt

Oct 2, 2024

#Thread on Vijaywada floods
In September this year, after a spell of heavy rain, Vijayawada was affected by severe floods. This thread would explore the geographical reasons behind it and what can be done from here.
(1/n)

2. #Map shows the profile of four major rivers in India. Vijayawada is in the lower section of Krishna river and close to where the river exits the plateau and enters the deltaic flat plains.

3. There are 3 basins in the region whose histories are intertwined. Vijayawada city is sitting on the Krishna and Kolleru systems. Though the Krishna river was also flooding, the city was actually flooded by Budameru Vagu, a seasonal river which is part of the Kolleru system

Read 26 tweets

Raj Bhagat P #Mapper4Life

@rajbhagatt

Aug 24, 2024

Google maps shows my GPS position to be well inside the sea in #Chennai Marina beach. But I was away from it. Why?

#Thread continuation of my previous one on Chennai #Marina beach
1/n

In the previous thread, I had explained how Marina beach is growing (sea becoming more and more land). Because of the longshore drift, lots of sand hence gets settled in the mouths of Cooum River.

To prevent further siltation in the mouth of the river, the government had built Groynes so that the capacity of the river doesn't get reduced.

Read 15 tweets

Raj Bhagat P #Mapper4Life

@rajbhagatt

Aug 16, 2024

#Thread
#Marina beach is one of the most iconic destinations in Chennai and one of the most visited beaches in the world. However the beach as we see today didn't exist a century ago.

This thread explains the formation of #Chennai's Marina beach
1/n

This map below shows the approximate original coastline of Chennai during British era. It was much closer to the Kamarajar road. A promenade was developed during the british era and that is when it got the name, "Marina". However the big sandy expanse itself didnt exist
2/n

Seas are very dynamic in nature. Whenever the waves hit the beach which is called as "swash", they bring in sand and when the water goes back ("backwash"), it removes the sand. This balance is critical for beach existence.