ESM203Final_2006 - ESM 203: Earth System Science (2006)...

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ESM 203: Earth System Science (2006) Final Examination Tom Dunne Date: Dec 7, 2006 Answers due 5 pm, Dec. 12, 2006 hand-delivered to Jose, or by email if previously arranged. Begin each question on a new page. The Final Examination counts 50% of your course grade. Answer all four questions, which are equally weighted. The exam is open-book. You do not have to repeat the question in your answer; just use the number and letter designations. You may use your notes, assigned readings, or other material. You may not use each other or any other human, so please do not discuss the exam with anyone else. You should refrain from even discussing the course at all, with anyone, between this afternoon and the time you submit your paper. Some of the questions are straightforward, and ask you essentially to re-explain what we covered in class. Others questions are more mature, and require you to apply what you have learned to something we did not explicitly teach you. Read the questions carefully and write succinct, focused answers. Some of the questions may tempt you to diverge into questions of ideology. Avoid this by concentrating on the technical or management issue being raised. Try to be complete but concise. If you have questions about the interpretation of the material, you may email Tom (before Sunday afternoon, Dec.10. I am leaving town at that time) . If you thereby identify something about the exam that is unclear, we will post the answer to the rest of the class. 1. Response of a Coastal Aquifer to Environmental Change Last year, I met a man who was charged by the European Union with estimating the approximate effect of global change on coastal aquifers and salt-water intrusion around islands and peninsulas in the Mediterranean Sea. The aquifers are recharged by the net of precipitation and evaporation on the land surface, and near the coast the fresh water in the aquifer ‘floats’ above a lens of denser sea water. Analyze the following problem using the Ghyben-Herzberg approximation of long-term average conditions, ignoring seasonal and inter-annual fluctuations of recharge. A coastal aquifer with a length of 15 km, consisting of fine sand with a hydraulic
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ESM203Final_2006 - ESM 203: Earth System Science (2006)...

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