وفّر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.
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المد والجزر هي موجات طويلة من المد البحري، تتحرك عبر المحيط استجابةً للقوى الجاذبة التي يمارسها القمر والشمس، حيث ينشأ المد والجزر في المحيط ويتقدم نحو السواحل حيث تظهر على شكل ارتفاع وانخفاض منتظم لسطح البحر.
يحدث في المد ارتفاع مؤقت ومتدرج في منسوب مياه سطح المحيط أو البحر، بينما تتميز مرحلة الجزر بانخفاض مؤقت تراكمي في منسوب مياه سطح المحيط أو البحر، حيث نلاحظ أن البحر بعيد ويترك رقعة كبيرة من الرمال كانت مغطاة عند ارتفاع المد، ويحدث المد والجزر المنخفض بأقصى درجة عندما تكون الأرض تشكل زاوية قائمة مع القمر.
من أهم أنواع المد والجزر ما يلي:
يؤثر المد والجزر على الصيد لأنه يسبب حركة المياه، فعندما يكون هناك زيادة في حركة التيار أو الماء، تزداد احتمالية قدوم الأسماك نحو المناطق الأقرب للشاطئ فيسهل صيدها، ويفيد المد والجزر النباتات والحيوانات العائمة لكي تركب التيارات المدية بين مناطق التكاثر والمياه العميقة، ويساعد على إزالة الملوثات وتدوير العناصر الغذائية التي تحتاجها نباتات وحيوانات المحيطات للبقاء على قيد الحياة.
نعم، ويوجد حالياً عدة طرق مختلفة للحصول على طاقة المد والجزر، حيث توضع التوربينات المولدة للطاقة في تيارات المد والجزر، فتدور بسبب تدفق المياه وتولد الطاقة الكهربائية.
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