scholarly journals Precipitation, temperature, groundwater-level elevation, streamflow, and potential flood storage trends within the Brazos, Colorado, Big Cypress, Guadalupe, Neches, Sulphur, and Trinity River Basins in Texas Through 2017

Author(s):  
Glenn R. Harwell ◽  
Jeremy McDowell ◽  
Cathina Gunn-Rosas ◽  
Brett Garrett
2013 ◽  
Vol 61 (4) ◽  
pp. 278-285 ◽  
Author(s):  
Václav Šípek

Abstract The present study focuses on the possible influence of large-scale climatic patterns on precipitation, temperature, and discharge in two distinct river basins in the Czech Republic. The first one is a flat lowland basin of the Cidlina River and the second one represents a more mountainous type of climate (the Blanice River). The large-scale climatic patterns used comprise monthly averages of teleconnection patterns, sea level pressure values, and two geopotential heights (850 hPa and 500 hPa). The correlations for corresponding months and also up to a three months lead time were investigated. The relations concerning the corresponding months proved to be most reliable in the winter period of the year. The behaviour of both selected river basins with respect to these predictors is rather similar in character. However, higher values of correlation coefficients are reached in the case of the Cidlina River basin. Considering the prediction abilities with a certain lead time, the results seem to be more promising for the winter and spring periods in both basins. In the Cidlina River basin, they are likely to be beneficial also for the late summer and autumn period.


Author(s):  
Ken Lawrence

Radiocarbon assays from select archaeological-geoarchaeological research projects within Texas river basins were compiled and recalibrated using the same calibration curve (i.e., INTCAL09). Chronometric data from investigations within the Nueces, San Antonio, Colorado, Brazos, and Trinity River basins were uniformly calibrated to construct a consistent chronological framework. Once calibrated, the analogous chronometric data were then used to compare drainage basins, paleoenvironmental data, and cultural chronologies across Texas and the region. These comparisons revealed four periods (Synchronous Events I–IV) in the Holocene that occurred simultaneously within all of the examined drainage basins. Synchronous Event I dating to 8,750–8,250 cal yr BP (~6800–6300 BC), Synchronous Event II dating to 7,000–6,250 cal yr BP (~5050–4300 BC), and Synchronous Event III 5,250–5,000 cal yr BP (~3300–3050 BC) are apparent periods of instability. While Synchronous Event IV occurs at 1,000–750 cal yr BP (~AD 950–1200) represents a period of stability. These events may be attributed to previously identified widespread climatic changes and seemingly coincide with several transitions in the archaeological record.


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