IIT Madras dredging methodology helps Odisha’s Chilika Lake to triple Irrawaddy Dolphin inhabitants – schooling


A analysis undertaking by the Indian Institute of Know-how (IIT) Madras has helped Odisha’s Chilika lake, Asia’s largest brackish water physique, in tripling the inhabitants of the Irrawaddy dolphins.

The searchers carried out geotechnical, hydraulic and satellite tv for pc imagery research and developed a dredging methodology with minimal affect on the lake ecosystem. The method of dredging consists of the excavation (loosening or dislodging) of the fabric from the underside, elimination of the loosened materials to the dredge vessel and finally transportation of the fabric to the position space.

The intervention by the premiere institute additionally benefitted the over 200,000 fishermen dwelling in 132 villages because it resulted in a seven-fold improve of fish catch and vacationers to co-exist with the lake ecosystem with minimal disturbance to the surroundings, the workforce claims.

“Chilika Lagoon is over 4,000 years previous and unfold over the Puri, Khurda and Ganjam districts of Odisha. The extremely productive ecosystem of the lake helps the livelihood for fishermen and in addition acts as drainage for Mahanadi river basin,” R Sundaravadivelu, Professor at Division of Ocean Engineering, IIT Madras mentioned. “The lake was in a degraded situation and included within the threatened record by Ramsar Conference in 1993. This warranted pressing motion for restoration of the lake,” he added. “The geotechnical, hydraulic and satellite tv for pc imagery research confirmed the spit of Chilika is continually altering. The sand bar has been widening, and the place of the mouth always shifting, shifting typically in direction of the northeast. The mouth was described as being about 1.5 km broad in 1780 and had decreased to half inside forty years in 1820.” “It additionally confirmed the Chilika lake mouth positioned initially close to Sipakuda in 1800 has regularly shifted within the final 200 years in direction of the northern facet to Arkhakuda,” he mentioned.

The IIT Madras workforce developed the dredging methodology figuring out the placement of dredging together with disposal and collection of appropriate dredger with minimal affect on the ecosystem. “Primarily based on the end result of this profitable hydrological intervention, the flood inundation and freshwater weeds are lowered. The hydrological intervention restored the lake ecosystem and ameliorated the biodiversity. The fish manufacturing elevated 7-fold and the inhabitants of extremely threatened Irrawaddy dolphin elevated,” Sundaravadivelu mentioned.

“The enhancement of fishery sources and the rise of inhabitants of Irrawaddy dolphin promoted ecotourism which immensely benefitted the native fishers,” he added.

Restored at a price of Rs 10 crore by opening the mouth and different associated works in six months’, the lake is now off the threatened record (Montreux document).

The Chilika Lake Authority has developed an Ecosystem Well being Report Card and periodical monitoring of salinity, fish and dolphin, freshwater weeds, birds and different organic parameters are being carried out.

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