Evolution of particulate organic matter (POM) along a headwater drainage: role of sources, particle size class, and storm magnitude

2017 ◽  
Vol 133 (2) ◽  
pp. 181-200 ◽  
Author(s):  
Richard Rowland ◽  
Shreeram Inamdar ◽  
Thomas Parr
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Particulate Organic Matter ◽  
Size Class

scholarly journals The role of log jams and exceptional flood events in mobilizing coarse particulate organic matter in a steep headwater stream

2015 ◽  
Vol 3 (1) ◽  
pp. 173-196 ◽  
Author(s):  
M. Jochner ◽  
J. M. Turowski ◽  
A. Badoux ◽  
M. Stoffel ◽  
C. Rickli
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Strong Relationship ◽  
Headwater Stream ◽  
Return Periods ◽  
Flood Events ◽  
Coarse Particulate Organic Matter ◽  
Effective Barrier ◽  
Over Time

Abstract. Export rates of coarse particulate organic matter (CPOM) from mountain catchments have been observed to strongly increase with rising discharge, but the mechanism leading to this strong relationship is unclear. Here, we show that log jams in the Erlenbach, a steep headwater stream in the Swiss Prealps, are an effective barrier for the transport of CPOM pieces, and thus become sites of storage of large quantities of material over time. Exceptional discharge events with return periods exceeding 20 years play a dual role in CPOM transport. First, they destroy existing log jams, releasing the stored material (wood and sediment). Second, they intensify channel-hillslope coupling, thereby recruiting new logs to the channel, around which new jams can form.

scholarly journals The role of log jams and exceptional flood events in mobilizing coarse particulate organic matter in a steep headwater stream

2015 ◽  
Vol 3 (3) ◽  
pp. 311-320 ◽  
Author(s):  
M. Jochner ◽  
J. M. Turowski ◽  
A. Badoux ◽  
M. Stoffel ◽  
C. Rickli
Keyword(s):  
Organic Matter ◽  
Particulate Organic Matter ◽  
Strong Relationship ◽  
Headwater Stream ◽  
Mountain Streams ◽  
Flood Events ◽  
Coarse Particulate Organic Matter ◽  
Sediment Transport Capacity ◽  
End Member Model

Abstract. Coarse particulate organic matter (CPOM) fulfills important functions in the physical and ecological system of a stream. CPOM delivery to and export from the stream has implications for the stream's morphology and sediment transport capacity as well as the energy budget and food availability. Export rates of CPOM from mountain catchments have been observed to strongly increase with rising discharge, but the mechanism leading to this strong relationship is unclear. Here, we show that log jams in the Erlenbach, a steep headwater stream in the Swiss Prealps, are an effective barrier for the transport of CPOM pieces, and thus become sites of storage of large quantities of material over time. Exceptional discharge events with return periods exceeding 20 years play a dual role in CPOM transport in the Erlenbach. First, they appear to destroy existing log jams, releasing the stored material (wood and sediment). Second, they intensify channel–hillslope coupling, thereby recruiting new logs to the channel, around which new jams can form. This allows for the formulation of a new, fully episodic end-member in a four-end-member model of CPOM dynamics of steep mountain streams based on wood delivery and export.

PENGARUH PENAMBAHAN SERBUK BATA MERAH TERHADAP NILAI CBR

2020 ◽  
Vol 14 (2) ◽  
pp. 47
Author(s):  
Muhammad Rayhan Agustian Arif ◽  
A'isyah Salimah ◽  
Putera Agung Maha Agung
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Soft Soil ◽  
Soil Conditions ◽  
Soil Functions ◽  
A Value ◽  
Brick Powder ◽  
Cbr Test ◽  
Loose Sediments

Abstract Soil is a collection of minerals, organic matter and relatively loose sediments that are located above the bedrock. Based on the particle size, it is divided into four types, namely gravel, sand, silt and clay. The role of soil is very important in a construction because the soil functions as a support for the loads that are above it, so that the soil is expected to have a good bearing capacity. In this study, the soil taken is soft soil in Hambalang, Bogor where the soil conditions in the area are hard in the dry season and soft in the rainy season, so it is necessary to review the CBR (California Bearing Ratio) value. In this study, using waste from red brick as an additive to soft soil. CBR testing is appropriate (SNI 1744: 2012), with the CBR Laboratory test soaked and unsoaked. Along with the addition of% red brick powder, the CBR values of soaked and unsoaked (top and bottom) have increased, so that the addition of% content of red brick powder is 15% respectively got a value of 4.55% and 4.9% (soaked) and 17.94% and 19.70 (unsoaked). So, from this CBR test, it was found that the effect of adding red brick powder increases CBR tilapia soaked and unsoaked soft soil of Hambalang. Keywords: Soft Soil, Red Brick Powder,CBR soaked, CBR unsoaked

Biological activity in metal-contaminated calcareous agricultural soils: the role of the organic matter composition and the particle size distribution

2014 ◽  
Vol 21 (9) ◽  
pp. 6176-6187 ◽  
Author(s):  
Luisa Martin Calvarro ◽  
Ana de Santiago-Martín ◽  
Javier Quirós Gómez ◽  
Concepción González-Huecas ◽  
Jose R. Quintana ◽  
...  
Keyword(s):  
Particle Size ◽  
Organic Matter ◽  
Biological Activity ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Agricultural Soils ◽  
Organic Matter Composition
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