Highway stormwater runoff in karst areas - Preliminary results of baseline monitoring and design of a treatment system for a sinkhole in Knoxville, Tennessee

2020 ◽  
pp. 173-181
Author(s):  
J. Brad Stephenson ◽  
W.F. Zhou ◽  
Barry F. Beck ◽  
Tom S. Green
Keyword(s):  
Stormwater Runoff ◽  
Treatment System ◽  
Preliminary Results ◽  
Baseline Monitoring ◽  
Karst Areas

Enhanced nutrient removal from stormwater runoff by a compact on-site treatment system

Chemosphere ◽  
2021 ◽  
pp. 133314
Author(s):  
Jiafu Xi ◽  
Zhen Zhou ◽  
Yao Yuan ◽  
Kaiqi Xiao ◽  
Yangjie Qin ◽  
...  
Keyword(s):  
Nutrient Removal ◽  
Stormwater Runoff ◽  
Treatment System

In-situ performance of a passive treatment system for metal source control

1999 ◽  
Vol 39 (2) ◽  
pp. 193-200 ◽  
Author(s):  
John J. Sansalone
Keyword(s):  
Stormwater Runoff ◽  
Glacial Till ◽  
Passive Treatment ◽  
Treatment System ◽  
Source Control ◽  
Field Scale ◽  
Design Life ◽  
Receiving Waters ◽  
Runoff Events

Urban stormwater often contains high levels of traffic-generated metal elements and particulates. These constituents are transported by stormwater runoff to surficial soils, drainage systems and receiving waters. This paper summarizes the in-situ field-scale performance of a passive treatment system called a partial exfiltration trench (PET) for source control of these constituents. For stormwater runoff infiltrated into the PET media, treatment occurs primarily by sorption and filtration. Previous bench-scale testing indicating a design life exceeding 10 years, demonstrated the potential viability of the PET, and justified construction and monitoring of a field-scale PET. In-situ performance of an instrumented field scale PET indicates mass removal efficiency generally exceeds 80% after 1 year of runoff loadings. Exfiltration from the PET to clayey glacial till soils has exceeded 30% for selected runoff events.

The O–C diagrams of minor planets − a new approach to modelling the rotation

1999 ◽  
Vol 173 ◽  
pp. 185-188
Author(s):  
Gy. Szabó ◽  
K. Sárneczky ◽  
L.L. Kiss
Keyword(s):  
Error Analysis ◽  
Time Dependence ◽  
Theoretical Work ◽  
Minor Planet ◽  
Minor Planets ◽  
New Approach ◽  
Preliminary Results ◽  
Ccd Observations

AbstractA widely used tool in studying quasi-monoperiodic processes is the O–C diagram. This paper deals with the application of this diagram in minor planet studies. The main difference between our approach and the classical O–C diagram is that we transform the epoch (=time) dependence into the geocentric longitude domain. We outline a rotation modelling using this modified O–C and illustrate the abilities with detailed error analysis. The primary assumption, that the monotonity and the shape of this diagram is (almost) independent of the geometry of the asteroids is discussed and tested. The monotonity enables an unambiguous distinction between the prograde and retrograde rotation, thus the four-fold (or in some cases the two-fold) ambiguities can be avoided. This turned out to be the main advantage of the O–C examination. As an extension to the theoretical work, we present some preliminary results on 1727 Mette based on new CCD observations.

Cyclic Evolution of Sunspots: Gleaning New Results from Old Data

2000 ◽  
Vol 179 ◽  
pp. 163-165
Author(s):  
S. K. Solanki ◽  
M. Fligge ◽  
P. Pulkkinen ◽  
P. Hoyng
Keyword(s):  
Sunspot Number ◽  
Sunspot Cycle ◽  
Preliminary Results ◽  
Butterfly Diagram

AbstractThe records of sunspot number, sunspot areas and sunspot locations gathered over the centuries by various observatories are reanalysed with the aim of finding as yet undiscovered connections between the different parameters of the sunspot cycle and the butterfly diagram. Preliminary results of such interrelationships are presented.

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