Please use this identifier to cite or link to this item:
The Study of water quality of the Da-Han stream and Danshuei Estuary
|Authors: ||Hui-Hsiu Chiu|
|Contributors: ||NTOU:Department of Marine Environmental Informatics|
Da-Han River, Danshuei estuary, nutrients, water quality index
|Issue Date: ||2011-06-30T08:15:48Z
|Abstract: ||大漢溪為淡水河流域之最大之流域，淡水河人口逾六佰萬的居民，超過台灣四分之一人口，環保署調查資料顯示大漢溪水質近年逐漸改善，為瞭解大漢溪及淡水河河口海域之水質現況，本研究採樣分析大漢溪中下游的水質，並使用修正之WQI(water quality index)水質指數，綜合評估大漢溪現今之水質狀況。 本研究兩次調查大漢溪中下游水質參數濃度範圍如下：酸鹼值 7.61-8.95；溶氧 0.77-8.13 mg/L；磷酸鹽0.13-6.49 μM；矽酸鹽 9.44-201.05 μM；氨氮 1.65-385.50 μM；亞硝酸鹽 0.87-38.60 μM；硝酸鹽6.54-131.59 μM；與葉綠素甲 0.54-3.88 μg/L，調查時在大漢溪中下游時有發現藻華現象，同時pH值高達8.9，大部分測站pH值偏高，大漢溪從浮洲橋至延平北路九段是比較不受潮汐影響的河段，其WQI指數範圍介於11-23，屬於超戊（惡劣）到戊（不良）類水質；而淡水河自關渡宮到海巡署出口，其WQI指數範圍介於16-42，屬於戊（不良）到丁（中下）類水質。本研究結果顯示大漢溪及淡水河水質介於超戊類到丁類水質。|
The Da-Han River is the largest tributary of the Danshuei estuary in northern Taiwan. More than six millions of population, exceeding one quarter of Taiwanses, live in the catchment area of the Danshuei River system. Due to over emphasizing the economic development in the past three decades, it is known that the Danshuei River system has been seriously polluted by anthropogenic activity, mostly from the domestic wastewater discharging into the river system. In order to understand the current state of the water quality of the Da-Han River and the Danshuei estuary, the present study analyzed pH, dissolved oxygen, chlorophyll a and nutrients of water samples from the Da-Han River and used the water quality index (WQI) to assess the water quality of the river system. This concentration ranges of the studied water parameters are as follows: pH, 7.61-8.95; dissolved oxygen, 0.77-8.13 mg/L; phosphate, 0.13-6.49 μM; silicate, 9.44-201.1 μM; ammonia, 1.65-385.5 μM ; nitrite, 0.87-38.6 μM; nitrate, 6.54-131.6 μM; and chlorophyll a, 0.54-3.88 μg/L. The elevated pH values were found in the Da-Han River during the sampled period because of algae bloomed. The WQI value in the middle section of the Da-Han River ranged within 11-23 and the water quality belonged to E-F according to the EPA classification. A slightly better water quality was observed in the Danshuei lower estuary and the WQI value ranged within 16-42 of which water quality belonged to D-E. Overall, the water quality from the Da-Han River to the Danshuei middle estuary is still poor.
|Appears in Collections:||[海洋環境資訊系] 博碩士論文|
Files in This Item:
All items in NTOUR are protected by copyright, with all rights reserved.