Sudip Saha

• B.Sc. (Hons), M. Sc. in Geology and Mining: M.Phil. in Hydrogeochemistry
• University of Rajshahi

The Tista is a Trans-Himalayan river that flows through Sikkim and West Bengal states of India and Rangpur division of Bangladesh and finally falls into the Brahmaputra River. The presence of numerous abandoned channels with various degrees of aggradations indicates large migrations of the Tista River. The pH value of groundwater varies from 6.20 t...

The photogeological mapping based on aerial photography is the prime technique for geoscience for research work.. The photogeological mapping based on aerial photography is more useful to identify the geological and geomorphological features. The present research work is carried out for Nawabganj Upazila, Dhaka district. For the current research wo...

The present research work is conducted with the water quality data of the Tista alluvial fan of the summer season. The lowered values of groundwater pH were documented which is suggestive of chemical breakdown of carbonic acid and lack of alkaline materials in the aquifer which results from the long-term weathering of the sediments. From the plot o...

Eight (8) distinct lithofacies within the fluviatile reach of the Tista River have been recognized by the detailed study of the sediments as exposed along the river bank and river bars. Genetically, the matrix-supported conglomerate (Gms), massive sand (Sm), Trough cross stratified sand (St), planar cross stratified sand (Sp), ripple laminated sand...

The geochemical analysis of the shallow aquifer sediments of the area of investigation reveals that they are acidic in nature. The mean electrical conductivity of the deposits is 1.16 dS/m that indicates very low or negligible effects of salinity of the sediments of the Rangpur division. The median values of the concentrations of total organic carb...

The present research work deals with the hydrochemical nature of the groundwater samples of the Dharla and the Tista River floodplains of Kurigram district, Bangladesh. The mechanism of groundwater chemistry was studied from the Gibbs plot and it can be summarized that precipitation and rock-water interaction are the major factors that influence th...

The present research work shows the dominance of iron in the industrial waste water and river water samples of the investigated area of Gazipur district. The mean iron concentrations for both types of water samples are higher than the maximum permissible limits of WHO and NEQS. The excess amount of iron in water can cause health hazards of the huma...

The present research work shows that the concentrations of heavy metals can be expressed as Fe>Mn>Zn>Ni>Cr>Pb>Co>As in the groundwater of Phulbari area, Dinajpur, Bangladesh on the basis of their abundance. The Plio-Pleistocene Dupi Tila aquifer sediment is principally composed of quartz, feldspar and lithic grains and is characterized by low ZTR i...

Arsenic is present in water samples within the studied active floodplain areas of the Tista river, Rangpur Division, Bangladesh. All the water samples contain less arsenic than the WHO prescribed limit of 10 μg/L. 93.33% groundwater samples have higher Mn content than the permissible limit of 0.01 mg/L of WHO. The heavy metal concentrations of wate...

The Tista River is a tributary of the Brahmaputra River. The deposits that exposed along the both banks of the Tista River are characterized mainly by sand, sand laden with gravel and pebble with minor amounts of silt and clay. The X-ray Diffraction (XRD) of the clay sized sediments of the Tista River reveals that illite (and/or mica), chlorite, ka...

The present study deals with the mineralogical composition of the sand deposits of the Jayanti estuary. The sands are composed of quartz (42.09%), feldspar (16.08%), rock fragments (0.79%), mica (4.75%), chlorite (0.75%), heavy minerals (8.45%), matrix (22.17%) and organic matter (4.48%) on an average. The relative abundance of the major minerals a...

The present X-ray diffraction analysis deciphers that the clay sized minerals of the Jayanti estuary are comprised principally of illite in combination with varying amounts of kaolinite, chlorite, quartz and feldspar. The amount of illite is highest in the headward part and lowest in the mouth of the Jayanti estuary. The positive correlation of fel...

The Old Brahmaputra is a tributary of the Brahmaputra River that finally falls into the mighty Meghna River at Bhairab Bazar, Bangladesh. The morphology of this river indicates that it is a meandering river. The sedimentary sequences are composed of alternate beds sands and clay. The coarser sand beds were deposited at high energy condition of the...

The size of the sediment varies from very fine sand to coarser silt. The frequency curves of the most samples are sharp peaked and narrow, indicating that the samples are well sorted to moderately well sorted, while one is moderately sorted. The average percentage of traction population is 2.90%, of saltation population is 71.24% and suspension pop...

Abstract: The present research work shows role of the anthropogenic activities on the hydrochemistry of the riverwater of the Tista river in its lower where it flows through plain land and finally fall into the Brahmaputra river in Rangpur division, Bangladesh. Field works were performed in the month of July, 2014. Sampling were done in four points...

The X-ray Diffraction (XRD) study of the clay deposits and the cementing materials of sands which are exposed along the Tista River is dominated by the illite (and/or mica), chlorite, kaolinite, quartz and feldspar. The accessory minerals include lavendulan, glauconite lepidolite, enstatite, sekaninaite and ferrierite. Lavendulan is a copper arsena...

The sediments deposited in the Tista River basin are characterized by the dominance of sand particles mixed with pebbles. The present study reveals that the grain size decreases to the downstream direction. The mean grain size ranges from 0.95 to 3.62. The sands are occasionally laden with the coarser particles mostly with cobbles and pebbles of di...

Abstract: The X-ray diffraction (XRD) study of the sediments of the Hizla-Gosairhat-Damudya-Burirhat branch of the mighty Meghna estuary reveals the dominance of illite in combination with varying amounts of kaolinite, chlorite, quartz and feldspar. The distribution of clay size minerals varies from mouth to headward part of the investigated branch...

The Dupi Tila Formation is composed of yellow to light brown medium to very fine moderately hard to loose sandstone, siltstone, silty clay, mudstone and shale with some conglomerates with clasts of petrified wood. The lithofacies of matrix supported conglomerate, trough cross bedded conglomerate, massive sandstone, trough cross bedded sandstone, pl...

The present research work deals with the lithofacies analysis along with the sequence stratigraphy of the Dupi Tila Formation, Lalmai Hills, Comilla to infer the depositional environment and paleogeography. The Dupi Tila Formation consists of alternation of yellow to light brown medium to fine grained sandstones and siltstone, grayish black to blui...

The Surma group of rocks are well-exposed in the steeper and faulted western flank as well as gentle and wider eastern flank of the asymmetric doubly plunging Sitakund anticline under the Chittagong district from Bariyadhala in the north to Barabkund in the south, which trends regionally in the NNW-SSE directions. Lithostratigraphically, the Bhuban...

The rock sequences of the Sylhet Limestone Formation, Dauki River section, Gwainghat, Sylhet were studied to identify their various petrological units, non-clastic minerals and fossil content. Limestones are of two varieties: crystalline in lower horizon and fossiliferous in upper horizon. The various petrological units identified in the non-elasti...

The Bhuban Formation along the Hari River section in Sylhet consists predominantly of shale, silty shale and sandy shale with subordinate siltstone, sandstone and conglomerate. Five lithofacies viz. Gm, Sp, Sm, S and F have been identified in the Formation. Numerous well-defined complete and incomplete Bouma sequences were recorded in turbidite san...

The present study on tide, morphology, lithofacies and evolution of the Meghna estuary is confined to its Hizla-Goshairhat-Damudhya-Burirhat (HGDB) branch which represents the relict main channel of the Meghna-Padma river system. Tide in this HGDB branch is semi-diurnal showing daily, monthly and yearly time versus water level asymmetry. This branc...

The sequence stratigraphy of the middle Holocene-Recent age of a portion of the Meghna estuary and Ganges delta in the south central part of Bangladesh has been constructed by using exposed sedimentary sequences along an old branch of the Meghna estuary. Seven lithofacies and three parasequences are recognized, the basal tide generated parasequence...

The Mio-Pliocene Dupitila Formation is exposed in its type area in a sub-latitudinal hill range known as Dupitila Hill Range, located at the foothills of the Shillong plateau within Jaintiapur Police Station, Sylhet, Bangladesh. These sediments are exposed at the southern margin of the homoclinal fold that is separated from the Shillong plateau by...

The Bhuban Formation of Lower Miocene Surma Group, exposed along the Hari river section, Jaintiapur, Sylhet. Bangladesh is composed mainly of shale with subordinate silty shale, sandy shale, siltstone and sandstone with occasional conglomerate. A total of ten samples, five from sandstones and five from shale, were analyzed for petrographic study. L...

The Holocene channel and bar complex within the old Chak Rajapur middle bar of the River Padma at Bagha in Rajshahi District exposes a~5 to 6 m fining and thinning up sequence of eight lithofacies. The channel-fill sequence dominates over the bar sequence where trough cross bedded sandstone (St), planar cross bedded sandstone (Sp), ripple cross-lam...

Seven distinct facies within the 25-kilometers estuarine reach of the Hizla-Gosairhat-Damudya-Burirhat branch of the Meghna estuary have been recognized by detail study of inter- and supra-tidal deposits as exposed along the eroding bank sections at 32 locations. Of these facies A and B are inter-tidal, C is episodic, D is tidal marsh, and G is int...