A Sampling Plan for System Reliability

Bagchi, Shrinjoy

doi:10.1177/0008068319760107

Cited by 5 publications

(3 citation statements)

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“…The Bengal Basin is formed by a chain of uvio-tectonic actions (Sengupta, 1966), subsurface geology is completely blanked by the quaternary sediments, composed of silty clay and the sand of various grades mixed with occasional gravels and thin intercalations of silt and clay (Sikdar and Sahu, 2009), characterized by interconnected shallow semi-con ned to con ned conditions' aquifers (Chakraborty et al 2009). The regional gradient towards the south-east (Basu and Sil, 2000) and the study area belongs to the semiactive mature portion up to the Sundarban from the south of the moribund delta (Bagchi, 1944). The study area is comprised of a at alluvial plain (Fenton et al 2017), only with different absolute heights.…”

Section: Study Areamentioning

confidence: 99%

Stable Cross -Section Index (SCSI): a new method to describe channel stability- A case study of the Ichamati River in a selected stretch along the Indo-Bangladesh international border

MONDAL

2024

Preprint

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The Ichamati river is an important drainage system of the district of North 24 Parganas, India, and as well as the Satkhira district of Bangladesh, flows southward indicating a common international boundary a 30 km long reach and thus posses an international character. The decaying condition of the river is the consequence of the miseries of the people of both countries. The river claims holistic management, but this common section is the hindrance of it. This article based on the unpublished secondary data, collected through a field visit by Ministers of Water Resources of both countries in September 2006, and besides this the hydraulic data were collected by the author by AA price Current meter. This paper has focused on a new method, Stable Cross–Section Index (SCSI) which is the numerical representation of the 2D standard form of any cross-section. To justify the SCSI, different parameters and methodology (ADAI) also have been implemented. The hydrological parameters such as discharge, Froude number, specific energy established a constant hydraulic regime in this section. The width, area, hydraulic radius remained insignificantly unchanged throughout the reach but significantly it is noticed that depth has been changed with the hydrological coefficient. The SCSI identified the stability of the river as average and below-average, which is constant throughout the reach with respective discharge.

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Section: Study Areamentioning

confidence: 99%

Stable Cross -Section Index (SCSI): a new method to describe channel stability- A case study of the Ichamati River in a selected stretch along the Indo-Bangladesh international border

MONDAL

2024

Preprint

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“…Frequent in ling and shifting of channels (Bhagirathi-Hooghly, Jalangi, Mathabhanga, Churni, Ichamati etc.) is the main cause behind origin of this deltaic land (Bagchi 1944).…”

Section: Study Areamentioning

confidence: 99%

Resolution effects on ox-bow lake mapping and inundation consistency analysis in moribund deltaic flood plain of India

Pal

Ghosh

2023

Environ Sci Pollut Res

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Research on investigating spatial resolution effect on image-based wetland mapping was done and found ner resolution image has more e ciency but how is it useful for spectral water indices based delineation of partially vegetation shaded ox-bow lake, a cut-off channels of a river, and mapping inundation frequency? In order to obtain these answers, the present study used Landsat and Sentinel images and computed spectral indices like Normalized differences water index (NDWI), Modi ed NDWI (MNDWI), Re-modi ed NDWI (RmNDWI) and ensemble Vegetation inclusive aggregated water index (ViAWI). For obtaining inundation consistency character, water presence frequency (WPF) approach was adopted. A set of accuracy matrices was applied for validating the resolution effect.The study revealed that ner resolution sentinel images are more effective in ox-bow lake mapping and characterising inundation frequency but it was not signi cantly better. Accuracy difference between them was very minimum. Therefore, the study recommended that in a Sentinel image sparse condition, Landsat images could alternatively be used. Among the used indices MNDWI was found suitable for ox-bow lake mapping but vegetation-shaded ox-bow lake was mapped using ensemble ViAWI. Inundation frequency analysis exhibited that about 70% area is consistent in water presence and therefore be hydroecologically viable and economically remunerative.

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“…The Rarh plains (RP) form mostly the western part of LGP (Bagchi & Mukherjee, 1979; Bandyopadhyay et al, 2015; Biswas, 1987; Chaudhuri, 1985; Kumar et al, 2020), which is located more than ~200 km upstream of the modern‐day tidal limit (Figure 1). The area is mainly contributed by the western tributaries of the Bhagirathi‐Hooghly River system (a distributary of the Ganga River system) and has long been considered the oldest part of the Ganga‐Brahmaputra delta (GBD) (Bagchi, 1944; Basu, 1973; Niyogi, 1975). However, a great deal of controversy among researchers regarding the western boundary of the GBD beyond the present course of the Bhagirathi‐Hooghly, which includes paradeltas formed by the western tributaries (Rudra, 2015; Strickland, 1940).…”

Section: Introductionmentioning

confidence: 99%

Late Holocene river dynamics and sedimentation in the Lower Ganga plains, India

et al. 2023

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Handling Editor: M. Ramkumar Packages of fluvial systems in the Lower Ganga plains (LGP) archive the changes in stratigraphic architecture induced by perturbations in the climatic system. In some parts of this landscape, where the fluvial sequences predominate, the role of climate in landsculpting is strongly indicated by the presence of sediment architecture. The present study is focused on the formation of alluvial plains of the Ajay River in the Rarh region that represent a region's environmental templates for understanding the landscape of LGP. The sedimentological, geomorphological, and optically stimulated luminescence (OSL) chronological investigations were attempted to document sedimentation patterns and the timing of deposition. The stratigraphic data from two exposed cliff sections and three boreholes are compared with proxy records to understand the Indian Summer Monsoon (ISM) controls on alluvial sedimentation for the last $2.4 ka. The fluvial packages in the study area correspond to two significant channel phases: Period-I (2.4-1.3 ka) and Period-II (800-200 years ago). Period-I is characterized by the episodes of floodplain development and lateral migration of the trunk river during Marine Isotope Stage (MIS) I, especially around 2 ka corresponding to the Roman Warm (RW) period in the Indian subcontinent. The sediment filling was high during $2.4 ka due to ISM intensification, but in the later stage, the sedimentation was at a fairly steady rate. Conversely, Period-II is characterized by flooding phenomena and aggradation of channel bodies across much of the present valley area during the last 800 years. The distinct flood events occurred during the times of significant shifts in ISM, from fluvial dormancy to sudden outbursts of monsoons (end of Little Ice Age [LIA] $ 19th century), indicating that climatic patterns can be associated with the occurrences of abrupt flood events. The alluvial records fit well with the historical, instrumental, and published proxy data on the ISM validating the chronology and the potential of sedimentary archives for further studies related to the palaeoenvironment and palaeogeography.

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A Sampling Plan for System Reliability

Cited by 5 publications

References 0 publications

Stable Cross -Section Index (SCSI): a new method to describe channel stability- A case study of the Ichamati River in a selected stretch along the Indo-Bangladesh international border

Stable Cross -Section Index (SCSI): a new method to describe channel stability- A case study of the Ichamati River in a selected stretch along the Indo-Bangladesh international border

Resolution effects on ox-bow lake mapping and inundation consistency analysis in moribund deltaic flood plain of India

Late Holocene river dynamics and sedimentation in the Lower Ganga plains, India

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