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The effects of Hurricane Hugo on suspended-sediment loads, Lago Loiza Basin, Puerto Rico

Earth Surface Processes and Landforms

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DOI: 10.1002/esp.3290180604

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Abstract

In the two main tributaries that enter Lago Loiza, Rio Grande de Loiza and Rio Gurabo, 99 600 tonnes of suspended sediment was transported by 58.2??106 m3 of runoff in a 48 h period. The storm-average suspended-sediment concentration in the Rio Grande de Loiza for Hurricane Hugo was 2290 mgl-1, the second lowest for the 12 storms that have been monitored at this site. In Rio Gurabo the storm-average suspended-sediment concentration was 1420 mg l -1, the sixth lowest recorded out of 15 monitored storms. In Quebrada Salvatierra, a small tributary to Rio Grande de Loiza, suspended-sediment concentrations were as low as 33 mg l-1 during peak runoff of 20m3s-1. Normally the suspended-sediment concentrations at this discharge are 300 mg l-1. Hurricane force winds seem to be the most important factor contributing to the lower than expected suspended-sediment loads. High winds caused vegetation and debris to be dislodged and displaced. Debris accumulated on hillslopes and in small channels, blocked bridges and formed debris dams. These dams caused local backwater effects that reduced stream velocities and decreased suspended-sediment loads. -from Author

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
The effects of Hurricane Hugo on suspended-sediment loads, Lago Loiza Basin, Puerto Rico
Series title:
Earth Surface Processes and Landforms
DOI:
10.1002/esp.3290180604
Volume
18
Issue:
6
Year Published:
1993
Language:
English
Publisher:
Wiley
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Earth Surface Processes and Landforms
First page:
505
Last page:
517
Number of Pages:
13