Watershed factors affecting stream acidification in the White Mountains of New Hampshire, USA

1987 ◽  
Vol 11 (1) ◽  
pp. 53-60 ◽  
Author(s):  
Scott W. Bailey ◽  
James W. Hornbeck ◽  
C. Wayne Martin ◽  
Donald C. Buso
2019 ◽  
Author(s):  
Caleb Forrest Town ◽  
◽  
Justin V. Strauss ◽  
Sean T. Kinney ◽  
Scott A. Maclennan ◽  
...  

2020 ◽  
Vol 2 (6) ◽  
Author(s):  
Melissa A. Lombard ◽  
Pamela J. Lombard ◽  
Craig J. Brown ◽  
James R. Degnan

AbstractFactors affecting iron fouling in wet areas adjacent to roadways were investigated by collecting field rock cut and aqueous physicochemical data; developing exploratory predictive models; and developing geochemical models. Basic data included the identification of iron fouling from aerial imagery and field visits at 374 New Hampshire rock cut locations, and their associated rock-fill sites. Based on field water quality measurements from wet areas at 36 of the rock-fill sites, the occurrence of iron fouling was associated with higher values of specific conductance, lower concentrations of dissolved oxygen and lower pH compared to areas without iron fouling. A statistical model, using boosted regression trees, was developed to predict the occurrence of iron fouling in wet areas adjacent to roadways where rock-fill from nearby rock cuts was used in roadway construction. The model was used to develop a continuous iron fouling probability map for the state of New Hampshire that can be used to better understand the occurrence of iron fouling. Geochemical models illustrate how iron fouling of waters increases along roadways built with fill from sulfidic rock cuts as a result of acid generation from pyrite dissolution and ferrous iron (Fe2+) oxidation and increases in areas with greater specific conductance from deicing runoff caused by cation exchange. More iron is precipitated as goethite in simulations that include pyrite, and in simulations with deicing salts added, indicating that rock-fill sites with rocks that contain pyrite and water with greater salt content could have enhanced iron fouling.


Geomorphology ◽  
2019 ◽  
Vol 345 ◽  
pp. 106842 ◽  
Author(s):  
Michelle L. Fame ◽  
James A. Spotila ◽  
Lewis A. Owen ◽  
David L. Shuster

2009 ◽  
Vol 123 (1) ◽  
pp. 1 ◽  
Author(s):  
Jillian R. Kelly ◽  
Todd K. Fuller ◽  
John J. Kanter

Recent and current distribution of state-threatened American Marten (Martes americana) in New Hampshire was identified by summarizing 157 occurrence records (1980–2004) in a database and mapped using Geographic Information Systems (GIS). Records included visual observations, snow tracks, road kill, trapper captures, systematic live-trapping locations, and other miscellaneous locations. Marten in New Hampshire are now found throughout the White Mountains north to the Canadian border, with the highest relative abundance in the very northern tip of New Hampshire. The recent expansion in the range of Martens includes reproducing females, but a sex ratio biased towards males in some areas suggests that dispersing individuals might inhabit much of the range.


2019 ◽  
Vol 94 ◽  
pp. 80-93
Author(s):  
Gordon R.M. Bromley ◽  
Brenda L. Hall ◽  
Woodrow B. Thompson ◽  
Thomas V. Lowell

AbstractAt its late Pleistocene maximum, the Laurentide Ice Sheet was the largest ice mass on Earth and a key player in the modulation of global climate and sea level. At the same time, this temperate ice sheet was itself sensitive to climate, and high-magnitude fluctuations in ice extent, reconstructed from relict glacial deposits, reflect past changes in atmospheric temperature. Here, we present a cosmogenic 10Be surface-exposure chronology for the Berlin moraines in the White Mountains of northern New Hampshire, USA, which supports the model that deglaciation of New England was interrupted by a pronounced advance of ice during the Bølling-Allerød. Together with recalculated 10Be ages from the southern New England coast, the expanded White Mountains moraine chronology also brackets the timing of ice sheet retreat in this sector of the Laurentide. In conjunction with existing chronological data, the moraine ages presented here suggest that deglaciation was widespread during Heinrich Stadial 1 event (~18–14.7 ka) despite apparently cold marine conditions in the adjacent North Atlantic. As part of the White Mountains moraine system, the Berlin chronology also places a new terrestrial constraint on the former glacial configuration during the marine incursion of the St. Lawrence River valley north of the White Mountains.


1946 ◽  
Vol 40 (5) ◽  
pp. 962-965
Author(s):  
Lashley G. Harvey

Although legally buried since 1891, the “precinct” in New Hampshire, like Banquo's ghost, continually arises to baffle students of New England local government. To the lawmakers, it is known as the village district; while in its annual report the state tax commission lists village districts as precincts, only adding to the confusion.In making a count of governmental areas in New Hampshire, one finds the state divided into ten counties. Within these, there are eleven municipalities classed as cities and 224 towns. The cities were once towns, but have been incorporated as cities by the legislature, not in accordance with a population prerequisite, but upon application. The first city to be incorporated was Manchester in 1846.All New Hampshire cities and towns include within their limits a great deal of rural land. Clusters of houses or settlements are sprinkled over these areas. Frequently, a settlement has several stores, a post office, and a railroad station and has the outward appearance of a village. Legally, however, such a settlement is not a village. It is administered entirely as a part of the town or city in which it is located, although it may be several miles from the principal urban center. New Hampshire has 639 such settlements, none of which is incorporated. Villages are not incorporated in New Hampshire as they are in Connecticut, Vermont, and Maine. Frequently they are referred to as places, but they should not be confused with the 23 so-called “unincorporated places” (found principally in the White Mountains), which are administered by the county and state governments almost completely. However, there are a few of the “villagelike” settlements within unincorporated places.


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