India: A Regional Geography

Learmonth, A. T. A.; Singh, R. L.

doi:10.2307/1797459

Cited by 5 publications

(19 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast, the Holocene F I G U R E 1 (a) Location of the Ganga Basin in India and division of the plains into Upper (UGP), Middle (MGP), and Lower (LGP) Ganga plains. The thick red line represents the present-day tidal limit in LGP (compiled from Singh, 1994;Sinha & Sarkar, 2009). The black rectangle shows the location of Figure 1b in the Ganga Basin.…”

Section: Regional Setting and Climatementioning

confidence: 99%

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

et al. 2023

View full text Add to dashboard Cite

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.

show abstract

Section: Regional Setting and Climatementioning

confidence: 99%

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

et al. 2023

View full text Add to dashboard Cite

show abstract

“…Gully formation due to deforestation has been reported from the Himalayan foothills and the Eastern plateaux (Mandal & Giri, 2021; Roy Mukherjee, 1995; Singh, 1971; Spate & Learmonth, 1967). The piedmont plains of the Himalayas, formed through coalescence of alluvial fans, are naturally prone to gully erosion because of the poor aggregate stability or shear strength of its soils and due to this region's break of slope (Ahmad, 1973, p. 48; Spate & Learmonth, 1967, p. 535).…”

Section: Gully Formation In India: the Causal Factorsmentioning

confidence: 99%

“…The piedmont plains of the Himalayas, formed through coalescence of alluvial fans, are naturally prone to gully erosion because of the poor aggregate stability or shear strength of its soils and due to this region's break of slope (Ahmad, 1973, p. 48; Spate & Learmonth, 1967, p. 535). Profligate lumbering in such an erosion‐susceptible region has, unsurprisingly, led to widespread gullying (Singh, 2008; Spate & Learmonth, 1967, p. 93), particularly in the Chos (meaning ‘torrents’) area in the state of Punjab (Singh, 1971, p. 122; Spate & Learmonth, 1967, p. 535). The severity of erosion (both gully and surface erosion) here becomes conspicuous from the fact that the Chos, which covered only 194 km 2 in 1852, expanded to 380 km 2 in 1897 and 1680 km 2 by 1939 (Singh, 1971, p. 122) and has continued to grow ever since (Mandal & Giri, 2021).…”

Section: Gully Formation In India: the Causal Factorsmentioning

confidence: 99%

“…In fact, some Indian regional geography books (e.g. Spate and Learmonth, 1967;Singh, 1971) use the term 'ravine' to refer to gullies, badlands and river gorges interchangeably. As this ambiguous terminology can cause confusion, we use the word 'badlands' when referring to extensively gullied regions and recommend its usage in the Indian context.…”

Section: Introductionmentioning

confidence: 99%

“…Such landscapes characterised by an extremely high drainage density are commonly denoted as ‘badlands’ (Bryan & Yair, 1982; Harvey, 2004; Howard, 1994; Schumm, 1956), and ‘ravine’ is a term that is normally used to refer to river gorges (Tinkler, 2004). In fact, some Indian regional geography books (e.g., Singh, 1971; Spate & Learmonth, 1967) use the term ‘ravine’ to refer to gullies, badlands and river gorges interchangeably. As this ambiguous terminology can cause confusion, we use the word ‘badlands’ when referring to extensively gullied regions and recommend its usage in the Indian context.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations