Preliminary Study of Sedimentation in Lake Tonle Sap, Cambodia

Tsukawaki, Shinji; Okawara, Masafumi; Lao, Kim-Leang; Tada, Motohiko

doi:10.5026/jgeography.103.6_623

Cited by 13 publications

(8 citation statements)

References 3 publications

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“…Tuskawaki et al (undated) indicated that prior to its connection to the Mekong River a palaeo Tonle Sap Lake not connected with the Mekong River and smaller than the present lake existed in the same location between about 7.5 and 5.5 thousand years ago. Tsukawaki et al (1994) believed that the presence of two marine diatom species, together with sponge spicules and the presence of balloon fi shes and rays living in the lake demonstrated that the lake must have been in recent connection with the sea, however a number of studies of biological remains in sediment cores including pollen (Mildenhall, 2002) diatoms (Akiba, 2002) and foraminiferans (Kato and Oda, 2002) have failed to fi nd any evidence of such a connection. Sponges, though not diverse in freshwaters are often abundant (Smith, 2001a), especially in tropical freshwaters and are common in the Mekong River and its tributaries.…”

Section: Ecological Characterization Of Tonle Sapmentioning

confidence: 99%

Species diversity and ecology of Tonle Sap Great Lake, Cambodia

Campbell¹,

et al. 2006

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Tonle Sap Great Lake in Cambodia, the largest natural freshwater lake in southeast Asia, is situated within the fl oodplain of the Mekong River. Water levels in the lake vary by about 8 m between the dry season minimum and the wet season maximum when waters from the Mekong River back up the Tonle Sap River. The lake is highly productive -the annual fi sh catch from the Lake is estimated at between about 180,00-250,000 tonnes while the dai fi shery on Tonle Sap River annually harvests about 12,000 tonnes of fi sh migrating from the lake to the Mekong River early in the dry season. At least 149 species of fi sh are recorded from the lake and it provides habitat for 11 globally threatened and 6 near-threatened species of vertebrates including globally important populations of Spot-billed Pelican, Greater Adjutant, Bengal Florican, Darter, Grey-headed Fish Eagle and Manchurian Reed Warbler. It also supports signifi cant reptile populations including formerly Siamese Crocodiles, now hunted close to extinction, and probably the world's largest harvest of freshwater snakes. The inundation area around the permanent lake is highly modifi ed, with areas having been cleared for farming and settlements, and many semi-natural areas altered by burning, fi rewood and timber harvesting. Nevertheless some 200 species of higher plants have already been recorded. Threats to the lake include pressure through growth of the local population dependant on the lake for subsistence and livelihoods, overharvesting of fi sh and other aquatic species and potential changes in the hydrology of the River due to the construction and operation of dams which could reduce the amplitude of the lake fl ood cycle. However concerns that the lake is rapidly fi lling with sediment are unfounded.

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Section: Ecological Characterization Of Tonle Sapmentioning

confidence: 99%

Species diversity and ecology of Tonle Sap Great Lake, Cambodia

Campbell¹,

et al. 2006

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“…1A), whilst investigating a report of a submerged stone bridge, measuring 25 m by 100 m. Despite the numerous core samples taken from the lake since the early 1960's (Carbonnel and Guiscafré, 1965;Carbonnel, 1972;Day et al, 2011;Penny, 2006;Tsukawaki et al, 1994Tsukawaki et al, , 1997Tsukawaki, 1997) e making the Tonle Sap one of the most intensively sampled lakes in Southeast Asia e there are no reports of Marchal's "friable blackish rock", or indeed any other consolidated surface which might be confused with a paved road. Pale-brown to dark-brown coloured sand has been observed in the northern part of the basin (at S3C1, Fig.…”

Section: The Tonle Sap Road Myth and Past Researchmentioning

confidence: 97%

Unearthing an Atlantean myth in Angkor: geoarchaeological investigation of the ‘underwater road’ crossing the Tonle Sap Lake, Cambodia

Pottier

Penny

Hendrickson

et al. 2012

Journal of Archaeological Science

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“…The size of Lake Tonle Sap varies from approximately 160 km long and 35 km wide during the dry season to 250 km long and 100 km wide at the height of flooding in the rainy season. The topological basin of the lake was formed approximately 5,500 years ago (Tsukawaki et al 1994). It is usually illustrated (e.g., in atlases) in its dry-season configuration, with a surface area of approximately 2,400 km 2 .…”

Section: Study Areamentioning

confidence: 99%

“…According to Oyagi et al (2014), the electrical conductivity of the upstream area of the Siem Reap River is approximately 2.0 mS m −1 ; this value indicates that almost no Figure 1. The river network around Lake Tonle Sap and the bathymetric map of Lake Tonle Sap (redrawn from Tsukawaki et al 1994).…”

Section: Introductionmentioning

confidence: 99%

Seasonal Changes in Water Quality as Affected by Water Level Fluctuations in Lake Tonle Sap, Cambodia

Oyagi

Endoh²,

Ishikawa

et al. 2017

Geog. Rev. Japan B

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Lake Tonle Sap has the largest surface area of any lake in Southeast Asia. The lake's water level varied by 8 m between seasons in 2005, which resulted in dramatic seasonal changes in the surface area. The quality of the lake water can be divided into two contrasting types in the low-and high-water-level periods. Measurements of water quality were made during the low-water-level period. Na-HCO 3 type water was a characteristic feature of the water quality in the foreshore areas from March to May of 2005. Of particular interest during the low-water-level period is the ratio of chloride ions to total dissolved solids. Changes in the quality of the lake water during low-water-level periods are caused in part by an increase in the influence of discharge from inflowing tributaries as the volume of lake water decreases. In addition, seasonal changes are caused by anthropogenic contamination from mobile villages of floating and folding houses situated around the lake margin. In contrast to the low-water-level period, the dominant composition during the high-water-level period was Ca-HCO 3 type water. The water quality of the lake during the rainy season does not appear to be affected by human activity but is significantly affected by reverse inflow from the Mekong River to Lake Tonle Sap.

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Preliminary Study of Sedimentation in Lake Tonle Sap, Cambodia

Cited by 13 publications

References 3 publications

Species diversity and ecology of Tonle Sap Great Lake, Cambodia

Species diversity and ecology of Tonle Sap Great Lake, Cambodia

Unearthing an Atlantean myth in Angkor: geoarchaeological investigation of the ‘underwater road’ crossing the Tonle Sap Lake, Cambodia

Seasonal Changes in Water Quality as Affected by Water Level Fluctuations in Lake Tonle Sap, Cambodia

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