Comparison of TOPMODEL streamflow simulations using NEXRAD-based and measured rainfall data, McTier Creek watershed, South Carolina

Author(s):  
Toby D. Feaster ◽  
Nancy E. Westcott ◽  
Robert J.M. Hudson ◽  
Paul Conrads ◽  
Paul M. Bradley
Author(s):  
Toby D. Feaster ◽  
Heather E. Golden ◽  
Kenneth R. Odom ◽  
Mark A. Lowery ◽  
Paul Conrads ◽  
...  

2007 ◽  
Vol 182 (1-4) ◽  
pp. 303-323 ◽  
Author(s):  
Gregory P. Lewis ◽  
Jennifer D. Mitchell ◽  
C. Brannon Andersen ◽  
Dennis C. Haney ◽  
Min-Ken Liao ◽  
...  

Author(s):  
Dorota Miroslaw-Swiatek ◽  
Devendra M. Amatya

Abstract Effects of cypress knee roughness on flow resistance and discharge estimates of the Turkey Creek watershed. In this study effects of cypress knees as vegetation resistance factor on Turkey Creek watershed discharge calculation were analyzed. The Turkey Creek watershed is a 3rd order stream system draining an approximate area of 5,240 ha. It is located at 33°08' N latitude and 79°47' W longitude, approximately 60 km north-west of City of Charleston in South Carolina (USA). Turkey Creek (WS 78) is typical of other watersheds in the south Atlantic coastal plain. In the case of Turkey Creek watershed, one of the main channels and riparian floodplain vegetation contains cypress trees. Cypress trees live in moist or swampy regions along the Atlantic coastal plain. The cypress trees are characterized by the unique root system called knees that appear just above the water line, up to 1.2 m above water surface. This study is conducted to examine the effects of roughness of cypress knee as related to its shape (diameter and height) on discharge estimates of the Turkey Creek watershed. Hydraulic characteristics of the cypress knees were determined by field inventory in selected cross-section along the main stream channel. The Pasche method was used to calculate the total Darcy–Weisbach friction factor in discharge capacity calculation of the study watershed. The results of this study show that the effect of vegetation shape in the Pasche approach is significant. If the variability of vegetation stem diameter is taken into consideration in the calculations, an increase by 10–32% in the values of friction coefficients occurs.


Data Series ◽  
10.3133/ds516 ◽  
2010 ◽  
Author(s):  
Laurel G. Woodruff ◽  
William F. Cannon ◽  
Christopher D. Knightes ◽  
Francis H. Chapelle ◽  
Paul M. Bradley ◽  
...  

GeoTextos ◽  
2020 ◽  
Vol 16 (2) ◽  
Author(s):  
Andrey Luis Binda ◽  
Roberto Verdum

<p>Os processos de arenização no sudoeste do Rio Grande do Sul são altamente dinâmicos, ora por meio da água, ora por ação dos ventos que remobilizam as exposições arenosas nos períodos com ausência de chuva. Assim, tanto o excesso como a escassez pluviométrica são fundamentais para a compreensão desses processos. Partindo desse pressuposto, o presente trabalho visa a analisar a ocorrência de estiagens e secas considerando uma série de dados pluviométricos (1970-2015) coletados na Bacia Hidrográfica do Arroio Miracatu, local este onde se encontra a maior extensão de áreas em processo de arenização. Considerando a metodologia empregada para a determinação de episódios de estiagem (períodos com mais de 15 dias sem chuva), constatou-se que houve registros em praticamente todos os anos estudados (exceto um). Mensalmente, a distribuição piramidal dos episódios coloca o trimestre maio-julho como o mais propício, embora possam ocorrer em qualquer época do ano. Contudo, a maior frequência de estiagens na década de 1970 é reflexo de um grande período seco, cuja determinação foi possível a partir do Índice Padronizado de Seca Pluviométrica.</p><p>Abstract</p><p>DRY PERIODS, DROUGHTS AND THE SANDIZATION PROCESSES IN MIRACATU CREEK WATERSHED, SOUTHWEST OF RIO GRANDE DO SUL STATE, BRAZIL</p><p>The sandization processes in the southwest of Rio Grande do Sul State are highly dynamic, sometimes through water action, sometimes due to winds action that remobilize sandy deposits in dry periods with no rain. Thus, both the excess and the absence of rain are fundamental for understanding this process. Based on this assumption, the present work aims to analyze the occurrence of droughts and dry periods considering a rainfall data series (1970-2015) collected in the Miracatu Creek Watershed, site where there is the largest extension of areas in the sandization process. Considering the methodology used to determine drought episodes (periods with more than 15 consecutives dry days), it was found that there were records in practically every year studied (except one). Monthly, the pyramidal distribution of episodes puts the May July quarter as the most favorable, although they can occur at any time of the year. However, the greater frequency of droughts in the 1970s reflects a long dry period, whose determination was possible based on the Standardized Precipitation Index.</p>


2013 ◽  
Vol 75 (2) ◽  
pp. 136-145 ◽  
Author(s):  
Amy Edwards ◽  
Devendra Amatya ◽  
Thomas Williams ◽  
Daniel Hitchcock ◽  
April James

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