ابحاث الزملاء والزميلات

من مشاركات الزملاء والزميلات من الجغرافيين والجغرافيات التي تخدم الباحثين والباحثات
COASTAL EROSION IN AL BATINAH, SULTANATE OF OMAN
 
الاستاذ: د. سالم بن محمد الحتروشي

الوصف الكامل
Introduction
Sandy beaches dominate most temperate and tropical shorelines, including the
coasts of the Sultanate of Oman. The focus of much human activity, both economic
and recreational, they are dynamic environments formed and continually modified by
the interactions between three elements: sand supply, waves and tidal energy. Sand
can be supplied from terrestrial and marine sources and is then sorted by waves and
tides, so that beaches are in dynamic equilibrium between erosional states following
storms and accretional states following calm weather. This dynamic equilibrium is a
critical part of natural coastal defence against storms; wave energy is neutralized in
moving sand off- and onshore. Beaches are also usually characterized by longshore
sand transport driven by oblique wave approach. Longshore transport is easily
disrupted by coastal engineering structures. Sea level rise associated with climate
change is also a factor impinging on sandy coasts worldwide.
Al Batinah coast, about 200 km in length, is heavily settled. One of the most
fertile areas in Oman, it has a shoreline made up more than 90% of sandy beaches.
Al Batinah beaches are mesotidal, tide dominated with low wave energy and limited
littoral drift of less than 100,000 m³ per year. All beaches have reflective upper
shores and broad tide-dominated terraces on their lower shores. These vary in detail
from place to place and are being continuously modified by the longshore transport
and wave-driven movement of sand. There is a split at Widam with longshore drift
eastwards east of this point and westwards west of it, probably coupled to broader
circulation in the Gulf of Oman.
Al Batinah coastal plain has been experiencing rapid development over the past
three decades. Residential housing, industrial, agricultural and fishing activities
have been concentrated along the coast. Infrastructure, including roads, corniches,
markets, mosques and fishing harbors are also constructed along the coast. Thirteen
recharge dams have been built on the major wadis in Al Batinah and adjacent areas.
The net effect of the dams is the reduction of terrestrial sediments supplied to the
shore. The corollary of the coastal structures and the recharge dams is potential
changes in the longshore sand transport as well as accretion and erosion patterns
along Al Batinah coast.
Erosion of some of the Al Batinah beaches in recent decades has prompted
several studies and requests for information and advice. This report summarizes the
findings of one such study, the most broad-based and interdisciplinary investigation
in this area to date.

الرابط الأول:

الملف الأول: