Wind erosion and intensive prehistoric agriculture: A case study from the Kalaupapa field system, Moloka'i Island, Hawai'i

2007 ◽  
Vol 22 (5) ◽  
pp. 511-532 ◽  
Author(s):  
Mark D. McCoy ◽  
Anthony S. Hartshorn
Keyword(s):  
Wind Erosion ◽  
Prehistoric Agriculture ◽  
Field System

The Internet is a Semicommons

2018 ◽  
Author(s):  
James Grimmelmann
Keyword(s):  
Open Field ◽  
Online Communities ◽  
Strategic Behavior ◽  
Private Property ◽  
The Internet ◽  
Field System ◽  
Technical Features ◽  
Dynamic Interplay ◽  
Enormous Success

78 Fordham Law Review 2799 (2010)The Internet is a semicommons. Private property in servers and network links coexists with a shared communications platform. This distinctive combination both explains the Internet's enormous success and illustrates some of its recurring problems.Building on Henry Smith's theory of the semicommons in the medieval open-field system, this essay explains how the dynamic interplay between private and common uses on the Internet enables it to facilitate worldwide sharing and collaboration without collapsing under the strain of misuse. It shows that key technical features of the Internet, such as its layering of protocols and the Web's division into distinct "sites," respond to the characteristic threats of strategic behavior in a semicommons. An extended case study of the Usenet distributed messaging system shows that not all semicommons on the Internet succeed; the continued success of the Internet depends on our ability to create strong online communities that can manage and defend the infrastructure on which they rely. Private and common both have essential roles to play in that task, a lesson recognized in David Post's and Jonathan Zittrain's recent books on the Internet.

Comparison of wind erosion based on measurements and SWEEP simulation: A case study in Kangbao County, Hebei Province, China

2017 ◽  
Vol 165 ◽  
pp. 169-180 ◽  
Author(s):  
Jia-Qiong Zhang ◽  
Chun-Lai Zhang ◽  
Chun-Ping Chang ◽  
Ren-De Wang ◽  
Gang Liu
Keyword(s):  
Wind Erosion ◽  
Hebei Province

scholarly journals Burial Mounds, Ard Marks, and Memory: A Case Study from the Early Iron Age at Bamble, Telemark, Norway

2020 ◽  
Vol 23 (2) ◽  
pp. 207-226
Author(s):  
Christian Løchsen Rødsrud
Keyword(s):  
Social Norms ◽  
Iron Age ◽  
System Analysis ◽  
Early Iron Age ◽  
Viking Age ◽  
Old Field ◽  
Field System ◽  
Burial Mounds ◽  
Point Of Departure

The point of departure for this article is the excavation of two burial mounds and a trackway system in Bamble, Telemark, Norway. One of the mounds overlay ard marks, which led to speculation as to whether the site was ritually ploughed or whether it contained the remains of an old field system. Analysis of the archaeometric data indicated that the first mound was related to a field system, while the second was constructed 500–600 years later. The first mound was probably built to demonstrate the presence of a kin and its social norms, while these norms were renegotiated when the second mound was raised in the Viking Age. This article emphasizes that the ritual and profane aspects were closely related: mound building can be a ritualized practice intended to legitimize ownership and status by the reuse of domestic sites in the landscape. Further examples from Scandinavia indicate that this is a common, but somewhat overlooked, practice.

scholarly journals Prediction of Wind Erosion over a Heritage Site: A Case Study of Yongling Mausoleum, China

2019 ◽  
Vol 3 (4) ◽  
pp. 41-57
Author(s):  
Xiaoyu Wang ◽  
Jinzhu Meng ◽  
Tianwei Zhu ◽  
Jingyu Zhang
Keyword(s):  
Wind Erosion ◽  
Cfd Simulation ◽  
Scale Model ◽  
Weather Data ◽  
Cfd Simulations ◽  
Wind Speeds ◽  
Heritage Site ◽  
Heritage Buildings ◽  
Computational Fluid Dynamics Cfd

AbstractTo protect heritage buildings better, a method exploiting computational fluid dynamics (CFD) was developed for the analysis of wind erosion at a heritage site. Over a two-year period, we collected measurements of hourly weather data at Xinbin County to obtain statistics of wind speeds and directions for the Yongling Mausoleum. Subsequent results from CFD simulations show that before greening, with wind speeds reaching 10 m/s, certain structures (southwest-facing corners, doors and windows on open sides, places where swirling winds develop, and eaves of sloping roofs) of four heritage buildings were eroded more severely. With appropriate greening, plants may exert their unique ecological presence to better protect heritage buildings and their historical environments. After greening, the severity of damage to these vulnerable structures by wind was reduced. With wind speeds reaching 10 m/s, the average pressure on the structures of each building was 0.41–27.85 Pa, representing a reduction of 2.4%–75.6% from pressures before greening. We also constructed a 1:500-scale model to verify in experiments the correctness of CFD simulation qualitatively. The CFD simulations were found to provide an effective method to investigate and predict wind erosion of the heritage site.

Wind Erosion at a Saline Playa Environment, Ebinur Lake, Xinjiang, China - A Case Study on the Source of Saline Dust Storm

2012 ◽  
Vol 260-261 ◽  
pp. 1003-1008
Author(s):  
Dong Wei Liu ◽  
Jilili Abuduwaili
Keyword(s):  
Vertical Distribution ◽  
Wind Erosion ◽  
Dust Storms ◽  
Aeolian Transport ◽  
Near Surface ◽  
Erosion Pins ◽  
Dry Lake ◽  
The Vertical Distribution ◽  
Main Factor

In many arid and semiarid lands, dry lake beds (saline playa) represent a tremendous source of unconsolidated salt-rich sediments that are available for aeolian transport. Severe salt-dust storms caused by the erosion of such landforms have become very harmful natural phenomena. Base on texture and appearance characteristic, five principal undisturbed playa surfaces for sampling to investigate the deflation rate and the vertical distribution of material abraded using a wind-tunnel experiment in this study. Two additional field deflation monitoring transect were aslo established to examine vertical deflation by wind from measurements of erosion pins at the Ebinur (dry) Lake. The results indicate that winds greater than 8 m/s is the main factor for inducing the erosion of the playa sediments. Soft salt, aeloian sediment and alluvial deposit are the main sources of the saline dust storms in Ebinur region. The near-surface vertical distribution of material abraded concentrated in 0 -10 cm height. The annual wind erosion rate ranged from 0.48 cm to 5.6 cm in the northwest portion of the lake and from 0.24 cm to 0.96 cm in the southeast portion.

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