کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4542555 1626716 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A note on salt intrusion in funnel-shaped estuaries: Application to the Incomati estuary, Mozambique
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
A note on salt intrusion in funnel-shaped estuaries: Application to the Incomati estuary, Mozambique
چکیده انگلیسی

Salt intrusion in estuaries is important for ecological reasons as well as water extraction purposes. The distance salt intrudes upstream depends on a number of factors, including river discharge, tidal and wind mixing and gravitational circulation. In this paper, an analytical solution is presented for the salt intrusion in a well mixed, funnel-shaped estuary whose cross sectional area decreases exponentially (with decay coefficient β) with distance, x, inland, and in which longitudinal mixing is constant along the length of the estuary. The solution predicts that a graph of the logarithm of salinity against exp (βx) should be a straight line, with slope proportional to the mixing coefficient Kx. The solution is tested against observations from 15 surveys over a four-year period in the Incomati estuary. Good straight line fits, as predicted, are observed on all surveys, with a mean R2 = 0.97. The average value of Kx for all surveys is 38 m2 s−1. The solution is used to make predictions about the minimum river flow required to prevent salt intruding to an extent where it causes a detrimental effect on water extraction. The minimum recommended river flow required to prevent this is 35 m3 s−1. In recent years, flow has fallen below this level for several months each year.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Estuarine, Coastal and Shelf Science - Volume 66, Issues 1–2, January 2006, Pages 1–5
نویسندگان
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