Marine investigations in the Lakshadweep Islands, India

Tripati, S.

doi:10.1017/s0003598x0006556x

Cited by 12 publications

(3 citation statements)

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“…Geology, geomorphology and hydrogeology of the island have been described in detail by many researchers (Pandit et al 1991;Tripathi 1999;Singh and Gupta 1999;Mallik 2001;Revichandran et al 2001;Banerjee et al 2011Banerjee et al , 2012Chattopadhyay Pallavi and Singh 2013). Coral formations (coral sand and coral lime stone) are generally porous and, surface water is completely absent.…”

Section: Site Descriptionsmentioning

confidence: 99%

“…TRM is possibly the best way to determine the hydraulic diffusivity (D = T/S, where T is transmissivity, S is storage coefficient) of highly hydraulically conductive aquifer system connected with ocean. The point values of effective hydraulic diffusivity are easily obtained from the interpretation of tidal response at a borehole (Mannadiar 1977;Tripathi 1999;Jhan et al 2003;Fkir and Razack 2003;Shih and Lin 2004;Trefry and Bekele 2004;Alcolea et al 2007;Banerjee et al 2008). …”

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A Conceptual Numerical Model to Simulate Aquifer Parameters

Chattopadhyay

Vedanti

Singh

2014

Water Resour Manage

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While in constant head aquifer, groundwater level before pumping and after recovery attain a constant value, it is quite challenging to estimate the actual discharge value in an atoll aquifer where the head fluctuates with tides. Lens shaped atoll aquifers are fragile in nature and pumping causes the water table to fall which could further aggravate sea water intrusion. Thus the objective of the study is to propose an alternative method and demonstrate the importance of tide-induced head fluctuations in analysing the aquifer parameter in atoll environment. The solution to a one-dimensional unsteady groundwater flow model in an atoll aquifer with sinusoidal fluctuations of the tide shows that the tidal response method (TRM) is reliable and safe in comparison to conventional methods of aquifer characterization. The aquifer parameter is described by the ratio of transmissivity to storage coefficient, known as hydraulic diffusivity. The observations of the tide and groundwater levels using loggers at 16 wells over the Kalpeni Atoll, Lakshadweep, India show that with distance from the coast, tidal efficiency decreases roughly exponentially and time lag increases linearly. The calculated hydraulic diffusivity (T/S) values using TRM range from 764 to 1,090,000 m 2 /day. In parallel, pumping tests are conducted in six shallow dug wells to validate the TRM data. Draw down and recovery data during pumping test are influenced by the tide-induced head fluctuations. The effect complicates the interpretation of the drawdown data. After subtracting the net tidal effects from the draw down data, the calculated parameter values are observed to be closer to the estimated parameter values from TRM.

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Section: Site Descriptionsmentioning

confidence: 99%

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confidence: 99%

A Conceptual Numerical Model to Simulate Aquifer Parameters

Chattopadhyay

Vedanti

Singh

2014

Water Resour Manage

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“…Lakshadweep was under the suzerainty of the Pallavas, Cholas and Ali Rajas of Kerala. It appears that the mainland had contact with these islands during the early centuries of the Christian era, if not earlier (Sila Tripati, 1999).…”

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Stone Anchors from Minicoy Island, Lakshadweep, India

Tripati

2009

International Journal of Nautical Archaeology

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Lakshadweep Islands lie on the sea route between South Asia, Far East and African countries. Being on the trade route, boats and ships used the islands of Lakshadweep as a stopover to take on fresh water. Lakshadweep Islands played an important role in the shipping route before the opening of the Suez Canal.In order to understand the earliest human habitation at Lakshadweep Islands 2The Lakshadweep Islands (Fig. 1) lie on the west coast of India. Until the opening of the Suez Canal they lay on the trade-route between the Mediterranean and South-East Asian countries, and in ancient times were used as a stopover to take on fresh water. It is difficult to ascertain exactly when these islands were inhabited but Saigal (1990) has postulated that they were first settled c.1500 BC. The ships of Gujarat might have passed these islands on their voyages to Egypt c.1500 BC, and terracotta artefacts discovered at Kalpeni may belong to this period. However, further archaeological exploration needed to be undertaken. The Archaeological Survey of India (ASI) and National Institute of Oceanography (NIO) carried out surveys on the Lakshadweep Islands in order to understand their earliest human occupation. Exploration at Kavaratti, Androth, Agatti and Kadmat Islands has yielded Red Polished Ware (RPW), red ware, black ware, dull-red ware and buff ware (IAR, 1983-4; Rao et al., 1995-6). Furthermore, red ware and coarse grey ware belonging to the Early Historic and Medieval periods were also found at Amini, suggesting that the Lakshadweep islands were inhabited during the Early Historic Period, if not earlier. Though Islam came to Lakshadweep after the 11th and 12th centuries AD, the islanders had established trade relations with Oman and other Gulf countries, exporting coconut, coir and coconut wood, for which the islands were famous. The inhabitants built stitched boats, completely constructed from coconut palms-hull, masts, stitches, ropes and even sails (Hourani, 1995). With the passage of time the maritime contacts between the people of Lakshadweep and Arabs became closer, as demonstrated by the discovery of an Indo- 3Arabian stone anchor in the Jama Mosque on Minicoy. This paper discusses the stone anchors of Minicoy Island, Lakshadweep, and ascribes tentative dates to them in relation to the maritime history of the islands. Indo-Arabian stone anchorThe Indo-Arabian stone anchor found at the Jama Mosque at Funhilol on Minicoy had been used as a lintel for the entrance. Some years back, when the mosque was renovated, the anchor had been removed, and was found lying within the compound (Fig. 2). The mosque was built in the year 1344 of the Hijri (2008 is the Hijri year 1429, so 1344 = 1923). It has been trimmed neatly, and chisel-marks are visible on the surfaces of the lower portion. The upper hole is circular and the lower holes are square (one smaller than the other). A piece has been chipped from the upper side of the anchor, but there are no signs of wear. The upper portion of the anchor is tapered and round and...

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The Builders of the Oceans – Part II: Corals from the Past to the Present (The Stone from the Sea)

Jiménez

Orejas

2016

Marine Animal Forests

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Marine investigations in the Lakshadweep Islands, India

Cited by 12 publications

References 1 publication

A Conceptual Numerical Model to Simulate Aquifer Parameters

A Conceptual Numerical Model to Simulate Aquifer Parameters

Stone Anchors from Minicoy Island, Lakshadweep, India

The Builders of the Oceans – Part II: Corals from the Past to the Present (The Stone from the Sea)

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