The recent landslide incident at Pettimudi in Rajamala near Munnar is very similar to what happened in Puthumala in 2019. I understand that a big rock overtopping the tea plantations has slipped down over the settlements of Tamil Dalit Labourers, leading to this horrifying tragedy.
Waiting in the wings
I am afraid that this was a disaster waiting in the wings to happen. As early as 2011 our Western Ghats Ecology Expert Panel had designated this locality as a region of highest ecological sensitivity, ESZ1.
In Kerala rainfall increases steeply with elevation. High rainfall and steep slopes render localities susceptible to landslides; hence ESZ1 areas are susceptible to landslides.
The extent of intact natural vegetation is the third component for assignment of ESZ1. Landslides are under check in areas with intact natural vegetation because of the binding of the soil by roots. However, any disturbance to natural vegetation renders a locality with high rainfall and with steep slopes susceptible to landslides. Such disturbances may include the construction of buildings and roads. quarrying or mining, replacement of natural vegetation by plantations, or levelling of the land using heavy machinery. Therefore, we expect that in the ESZ1 areas such as disturbance of natural vegetation and soil would mean the greater danger of landslides.
We strongly recommended avoiding these kinds of disturbing activities and had our recommendations been accepted, there is no doubt that the extent and intensity of landslides in Kerala in 2019 and 2020 would have been much lower.
Unfortunately, not only have our recommendation to bring such disturbing activities to a halt been ignored, instead the pace at which these disturbances are taking place has increased over the last 9 years.
There are other compounding factors as well. There are a now a large number of rock quarries afflicting the hilly regions of Kerala, and it is likely that some of them lie in the vicinity of Pettimudi. Even if they are not close to the landslide site shock waves from the blasting of rocks in quarries slowly weaken the rocks in the surrounding areas enhancing chances of landslides. So, regrettably, the Pettimudi landslide tragedy is no surprise.
A hot and angry earth
All these changes are taking place on an earth that is getting warmer and warmer. The last 40 years have been warmer than the average for the 20th century; 12 of the warmest years all occurred after 1998. The world is already warmer by 1-degree celsius.
There is a broad scientific consensus that this climate change would lead to an increasing frequency of extreme events such as heat or cold waves or intense rainfall. As the world gets warmer there is more water vapour in the air leading to more frequent intense rainfall events. This is a global trend; even more significant are the local effects.
Vapour in the air condenses when there is an updraft. Western Ghats force moisture-laden winds coming from the Arabian Sea to rise resulting in high levels of rainfall on the western slopes and the crestline of the Ghats. Elsewhere air may rise if the ground below is locally heated. This happens wherever the original vegetation cover of the land is replaced by the cement-concrete jungles of cities, highways and rocks exposed due to mining and quarrying.
Moreover, India is characterized by the world’s highest levels of aerosols, minute particles emanating from automobile emissions and dust from construction, mining and quarrying, especially pulverizing rocks to produce mechanical sand. As water vapour in air laden with aerosols begins to condense, it initially forms myriads of small water droplets. These then coalesce to form larger heavy water drops that lead to intense rain over shorter periods. So, what would otherwise have constituted a gentle drizzle lasting 6 hours, now pours down 3 hours later in 30 minutes as an intense lashing of rain. The result is more intense floods as well as increased chances of landslides, of breaching of bunds, and collapse of buildings.
Water heats up more slowly than the air; moreover, there is an enormous store of water in the oceans that cover 70% of earth’s surface with trenches that are deeper than Mount Everest. Nevertheless, ocean waters have now warmed enough to drive major changes.
The frequency of cyclones over the Arabian Sea has been consistently increasing over the last few years but all these were going west towards Oman.
In an unprecedented development, a severe cyclonic storm has made landfall on the west coast of India for the very first time, at least since reliable satellite-based observations became available since 1980.
This time, it was Maharashtra’s Konkan coast that was hit by the cyclonic storm Nisarg. While Nisarg is thus the first-ever severe cyclonic storm to make landfall on the West Coast of India, it will surely not be the last one since the Arabian Sea is bound to continue getting warmer and warmer.
So, many more severe cyclones will hit the West Coast, perhaps of Goa or Karnataka or Kerala in the coming years and inflict colossal economic damage.
All over the world, the sea level has been rising more rapidly than had been expected. This rise is particularly notable in the tropics.
At the same time, the ground is sinking in cities like Ernakulam due to the weight of construction and the lowering of groundwater level consequent on overuse. The shallowing of the rivers, estuaries and coastal waters due to deforestation and mining and quarrying is further adding to the woes.
In fact, the entire West Coast is today plagued by blatant violations of the coastal regulatory zone, construction of highways that destroy the remaining tree cover and environmentally degradative projects like the Vasco De Gama Coal Port in Goa, Tadadi Coal Port in Karnataka and Vizhingjam Coal Port in Kerala.
Water heats up more slowly than the air; moreover, there is an enormous store of water in the oceans that cover 70% of earth’s surface with trenches that are deeper than Mount Everest. Nevertheless, ocean waters have now warmed enough to drive major changes.
The frequency of cyclones over the Arabian Sea has been consistently increasing over the last few years but all these were going west towards Oman.
In an unprecedented development, a severe cyclonic storm has made landfall on the west coast of India for the very first time, at least since reliable satellite-based observations became available since 1980.
This time, it was Maharashtra’s Konkan coast that was hit by the cyclonic storm Nisarg. While Nisarg is thus the first-ever severe cyclonic storm to make landfall on the West Coast of India, it will surely not be the last one since the Arabian Sea is bound to continue getting warmer and warmer.
So, many more severe cyclones will hit the West Coast, perhaps of Goa or Karnataka or Kerala in the coming years and inflict colossal economic damage.
All over the world, the sea level has been rising more rapidly than had been expected. This rise is particularly notable in the tropics.
At the same time, the ground is sinking in cities like Ernakulam due to the weight of construction and the lowering of groundwater level consequent on overuse. The shallowing of the rivers, estuaries and coastal waters due to deforestation and mining and quarrying is further adding to the woes.
In fact, the entire West Coast is today plagued by blatant violations of the coastal regulatory zone, construction of highways that destroy the remaining tree cover and environmentally degradative projects like the Vasco De Gama Coal Port in Goa, Tadadi Coal Port in Karnataka and Vizhingjam Coal Port in Kerala.
WhatsApp us
Pingback: Kardinal Stick
Pingback: สล็อตเว็บนอก