ADJUSTMENT OF STREAM CHANNEL CAPACITY FOLLOWING DAM CLOSURE, YEGUA CREEK, TEXAS1

Journal of the American Water Resources Association - Tập 38 Số 6 - Trang 1521-1531 - 2002
Anne Chin1, Daniel Harris1, Todd H. Trice1, Jeffrey L. Given1
1Respectively, Associate Professor and Research Assistants, Department of Geography, Texas A&M University, College Station, Texas 77843 (E‐Mail/Chin: [email protected]).

Tóm tắt

ABSTRACT: In Yegua Creek, a principal tributary of the Brazos River in Texas, surveys of a 19 km channel reach downstream of Somerville Dam show that channel capacity decreased by an average of 65 percent in a 34 year period following dam closure. The decrease corresponds with an approximately 85 percent reduction in annual flood peaks. Channel depth has changed the most, decreasing by an average of 61 percent. Channel width remained stable with an average decrease of only 9 percent, reflecting cohesive bank materials along with the growth of riparian vegetation resulting from increased low flows during dry summer months. Although large changes in stream channel geometry are not uncommon downstream of dams, such pronounced reductions in channel capacity could have long‐term implications for sediment delivery through the system.

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Journal of the American Water Resources Association

Tập 38 Số 6

1521-1531

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