Fig 2 - uploaded by Anoop Ambili
Content may be subject to copyright.
2: Longitudinal profile of the Spiti River extracted from Losar to its confluence point with the Sutlej River (Khab). See 1B for location of extracted profile. Hack indices are also calculated at different segments along the Spiti River profile. Changes in gradient and Hack indices demonstrate the response of stream profile to active faults in the region. Refer to 1B for location of faults and landslides.
Source publication
The Indian summer monsoon (ISM) is one of the largest climate systems on earth and impacts the livelihood of nearly 40% of the world’s population. Despite dedicated efforts, a comprehensive picture of monsoon variability has proved elusive largely due to the absence of long term high resolution records, spatial inhomogeneity of the monsoon precipit...
Citations
... And the algal production was found to be low in monsoon season due to the water dilution. The Chlorophyceae was the dominant group recorded now, which coincided with the predominantly recorded diatoms, as repeated earlier by Ambili (2013). In cooler environs, the green and cyanophycean algae replace the diatoms because of intense incoming nutrients along the catchment area (due to anthropogenic activity). ...
Background
The fresh water environment supports the productivity of phyto- and zooplankters and fin and shell fishes. The rate of fish productivity of an aquatic ecosystem solely depends on the rate of plankton productivity, and which in turn critically depend on the concentration and variation of hydrographical features. The current investigation was focused on the distributional pattern of phyto- and zooplankton vis-à-vis physicochemical characteristics in Perumal Lake, Cuddalore District, Tamil Nadu State (India).
Results
The hydrographical factors and phytoplankton as well as zooplankton diversity were studied at the monthly interval of 12 months by following the standard methods in freshwater of Perumal Lake from September 2018 to August 2019. Presently a total of 15 species of phytoplankton and 15 species of zooplankton were recorded in Perumal Lake. The present study reveals good variation in the hydrographical characteristics, such as temperature (24.2–30.1 °C), turbidity (10.4–43.2 NTU), total suspended solids (300.2–1800.8 mg/L), conductivity (3.25–10.54 mhos/cm), pH (6.92–8.2), total hardness (8.58–23.8 mg/L), dissolved oxygen (2.8–7.26 mg/L), dissolved carbon dioxide (0.96–13.2 mg/L), chloride (1.92–23.8 mg/L), nitrate (0.28–3.18 mg/L), sulphate (1.1–8.2 mg/L) and phosphate (0.19–3.34 mg/L).
Conclusions
The findings of the present study indicate that the temperature has influence on phytoplankton as well as zooplankton diversity of species. Regular monitoring of hydro-biological parameters is necessary to assess the health of the lake ecosystem.
... Bookhagen et al., 2005) whereas an intensified monsoon phase (Bookhagen et al., 2006) increases the transport capacity. The 36 and~14-15 ka aggradation events in Western Himalaya were related to the end of the intensified monsoon phases (Bookhagen et al., 2006;Dortch et al., 2011) whereas the~4 ka event was synchronous with dry conditions described in the lakes of the High Himalaya (Ambili, 2013) and Jammu areas (Trivedi et al., 2013). Therefore, the episodic fluvial aggradation/ b c a Fig. 10. ...
The recent activity of the Medlicott-Wadia Thrust (MWT) is investigated by geomorphic and tectonic studies in the Riasi zone, south of the Pir Panjal range (India, Jammu-Kasmir state of western Himalaya). In the Riasi area, the MWT forms a splay of five faults that dip northward. The recent activity of the splay is quantified using a set of deformed Quaternary alluvial units. The central branch of the thrust splay moved Precambrian limestones above Quaternary sediments and is sealed by 36 ± 3 ka (youngest OSL age) deposits. The other branches offset the top of a 15 ± 1 ka (youngest OSL age) alluvial fan by 180 to 120 m; the two southernmost branches form 17–34 m high non-cylindrical scarps and the two northernmost branches also offset the fan by ∼8 m and ∼54 m, respectively. A balanced cross-section parallel to the N210°E thrust motion suggests that the sequence of activity is complex: an in-sequence propagation is found for the three southern Tea, Scorpion and Rain faults and an out-of-sequence reactivation for the northern Pillar fault. Furthermore, several thrusts simultaneously activated for intervals of a few thousand years, whereas others are episodically inactive. Nearly 10 mm/yr of India-Eurasia convergence is regularly absorbed by the MWT, a value greater than the one estimated for the western segment of the MWT affected by the 2005 Kashmir earthquake, where the thrust tectonics interacts with the complex kinematics of the syntax. This work indicates that the MWT is very active and might be related to thick-skinned tectonics in the western Himalaya.
... Bookhagen et al., 2005) whereas an intensified monsoon phase (Bookhagen et al., 2006) increases the transport capacity. The 36 and~14-15 ka aggradation events in Western Himalaya were related to the end of the intensified monsoon phases (Bookhagen et al., 2006;Dortch et al., 2011) whereas the~4 ka event was synchronous with dry conditions described in the lakes of the High Himalaya (Ambili, 2013) and Jammu areas (Trivedi et al., 2013). Therefore, the episodic fluvial aggradation/ b c a Fig. 10. ...
