Roman Jakobson’s paper to The First World Conference on Yiddish Studies, 1958: “The Languages of the Diaspora as a Particular Linguistic Problem”

In an earlier piece in the ‘Sunday Histories’ series, I discussed the work Roman Jakobson did for Franz Boas on the Paleo-Siberian and Aleutian …

Roman Jakobson’s paper to The First World Conference on Yiddish Studies, 1958: “The Languages of the Diaspora as a Particular Linguistic Problem”
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Sinuosity Index (Sinuosity)

The sinuosity index (also called sinuosity or sinuosity coefficient) is a dimensionless metric that quantifies the degree of meandering or curvature in a channel, such as a river or stream. It is calculated as the ratio of the actual path length of the channel (curvilinear length) to the straight-line distance (Euclidean distance) between two endpoints, commonly the source and mouth of a river.​Sinuosity Index (SI)=Channel lengthStraight-line distance (downvalley or valley length)Sinuosity Index (SI)=Straight-line distance (downvalley or valley length)Channel length

{\displaystyle {\text{SI}}={\frac {\text{channel length}}{\text{downvalley length}}}}
  • A sinuosity index of 1 means the channel is perfectly straight.
  • Values greater than 1 indicate increasingly winding, twisting, or meandering paths.

Classification by Sinuosity Index

  • SI < 1.05: almost straight
  • 1.05 ≤ SI < 1.25: winding
  • 1.25 ≤ SI < 1.5: twisty
  • SI ≥ 1.5: meandering

Geographical and Hydrological Importance

  • The sinuosity index helps in understanding river dynamics, sediment transport, flood management, and landscape evolution.
  • It is affected by factors such as river slope, sediment type, discharge, structural geology, and vegetation. Sinuosity often increases as slope decreases, and meandering is typically associated with mature river phases.

In summary, the sinuosity index is a widely used indicator in geomorphology and hydrology to compare the straightness or curviness of fluvial channels and other natural or artificial paths.

Source(s) and Link(s):

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River Stages:Middle Course of the River – Meanders & Ox-bow Lakes

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Strahler Stream Order System

Stream order is a method used in geomorphology and hydrology to classify and rank streams and rivers within a drainage basin based on their hierarchy and complexity. It is an important concept for understanding river systems, as it helps categorize streams from the smallest headwater channels to the largest rivers.

Strahler Stream Order System

  • First-Order Streams: These are the smallest unbranched tributaries. They have no upstream tributaries feeding into them.
  • Second-Order Streams: Formed when two first-order streams join.
  • Third-Order Streams: Created when two second-order streams join.
  • General Rule: When two streams of the same order merge, the next highest order results. If streams of different order meet, the resultant stream retains the higher order of the two.
  • Headwaters: Streams of orders one through three are considered headwater streams; four through six are intermediate, and higher orders indicate larger rivers or main channels.

Stream Ordering Characteristics

  • Hierarchical Structure: Stream order increases downstream in a river basin as similarly ranked streams merge.
  • Stream Properties: As stream order increases, the width, volume, sediment load, mineral content, and turbidity typically increase, while velocity may decrease.
  • Application: Used for watershed analysis, flood risk assessment, ecological studies, and river management.

Visual Summary

Stream OrderDescription
1st OrderSmallest headwater, no tributaries
2nd OrderTwo 1st order streams join
3rd OrderTwo 2nd order streams join
Higher OrdersContinue as same-order streams merge

  • The largest river systems in the world can reach as high as 12th order (e.g., the Amazon River).
  • The method provides a systematic way to analyze river networks and supports morphometric analysis of drainage basins.

Stream order is foundational for hydrological modeling, river system management, and understanding riverine landscapes.

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Communalism : A Perspective

Communalism refers to a strong allegiance to one’s own community, especially when this sense of identity leads to division, antagonism, or conflict between groups based on religious, ethnic, or social distinctions. In the context of India, communalism is most commonly understood as an ideology that divides society along religious lines, often inciting intolerance, political mobilization, and sometimes violence between communities, particularly Hindus and Muslims.

  • Communalism can be seen as a social, political, and economic ideology that prioritizes the interests of one group above others and may manifest as shared possession and a sense of exclusive loyalty to the community.
  • It fosters an “us vs. them” mentality, sometimes leading communities to perceive others as adversaries, resulting in rivalry and antagonism.
  • In positive contexts, communalism can involve efforts to uplift one’s own community; in negative contexts, it can foster intolerance, hatred, separatism, and social division.

Types

Sociologists such as T.K. Oommen and Bipan Chandra identify several types of communalism, especially relevant in the Indian context:

  • Assimilationist: Attempts to integrate minority communities into the practices of the dominant group.
  • Welfarist: Focuses on the welfare of certain religious groups, sometimes reinforcing sectarian identities.
  • Retreatist: Promotes withdrawal from political or social participation on religious grounds.
  • Retaliatory: Arises from mutual hostility and often results in violent confrontations.
  • Separatist: Seeks separate identity or autonomy based on religious lines.
  • Secessionist: Advocates complete separation from the nation, often through violent means.

Causes and Impacts

  • Communalism is fueled by religious, cultural, and economic differences and is often heightened by political propaganda and mobilization.
  • Historically, communalism has arisen due to both social diversity and political manipulation, notably during the British colonial era.
  • Its impact includes social fragmentation, riots, and threats to national integrity, making it a significant challenge for multi-ethnic and religious societies like India.

Some Definitions

  • Bipan Chandra defines communalism as the belief that people sharing a religion have common social, political, and economic interests which override other differences in society.
  • Communalism is sometimes considered a form of segregation, chosen by groups seeking isolation or dominance.

In summary, communalism is a multifaceted concept involved in dividing society along tightly held community lines, particularly religion, which can both shape group identity and threaten social cohesion through antagonism and conflict.

Link(s) and Source(s):

read more here, here

Basic Types of Communalism

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