C1em10352k 2755..2762
نویسندگان
چکیده
Identification of representative sampling sites is a critical issue in establishing an effective water quality monitoring program. This is especially important at the urban–agriculture interface where water quality conditions can change rapidly over short distances. The objective of this research was to optimize the spatial allocation of discrete monitoring sites for synoptic water quality monitoring through analysis of continuous longitudinal monitoring data collected by attaching a water quality sonde and GPS to a boat. Sampling was conducted six times from March to October 2009 along a 6.5 km segment of the Wen-Rui Tang River in eastern China that represented an urban–agricultural interface. When travelling at a velocity of 2.4 km h , this resulted in water quality measurements at 20 m interval. Ammonia nitrogen (NH4+–N), electrical conductivity (EC), dissolved oxygen (DO), and turbidity data were collected and analyzed using Cluster Analysis (CA) to identify optimal locations for establishment of long-term monitoring sites. The analysis identified two distinct water quality segments for NH4 –N and EC and three distinct segments for DO and turbidity. According to our research results, the current fixed-location sampling sites should be adjusted to more effectively capture the distinct differences in the spatial distribution of water quality conditions. In addition, this methodology identified river reaches that require more comprehensive study of the factors leading to the changes in water quality within the identified river segment. The study demonstrates that continuous longitudinal monitoring can be a highly effective method for optimizing monitoring site locations for water quality studies.
منابع مشابه
4.18 Principles of Cathodic Protection
4.18.1 Historical Background 2747 4.18.2 Electrochemical Principles 2748 4.18.2.1 Aqueous Corrosion 2748 4.18.2.2 Cathodic Protection 2748 4.18.2.3 Oxygen Reduction 2749 4.18.2.4 Hydrogen Evolution 2750 4.18.3 Methods of Applying Cathodic Protection 2751 4.18.3.1 Impressed Current Method 2751 4.18.3.2 Sacrificial Anodes 2752 4.18.4 Proof of Protection 2753 4.18.4.1 Steel 2753 4.18.4.2 Other Met...
متن کاملSafety, tolerability and pharmacokinetic properties of the novel triazene TriN 2755 in tumor bearing dogs
TriN 2755 is an alkylating antineoplastic agent for intravenous (IV) use, carrying the triazene group as the cytotoxic principal. Using a standard 3 + 3 design, a phase I study was performed in tumour bearing dogs to determine the maximum tolerated dose (MTD), the dose limiting toxicity (DLT), and pharmacokinetic (PK) profile of TriN 2755. Thirty dogs were included in the study. TriN 2755 was a...
متن کاملProtective power of colloid is inversely proportional to the gold number
D. Pharm., B.Sc. (Hons), B.Pharm. (Hons), M.Pharm., Ph.D., FICS, CChem FIC (India), CChem FRSC (UK), CSci (UK), AOM (USA) Professor, Department of Pharmaceutical Chemistry, Shri Sarvajanik Pharmacy College, Gujarat Technological University, Arvind Baug, Mehsana-384001, Gujarat, India Phone: 00-91-2762-247711 (Ext-307); Fax: 00-91-2762-247712 Website: http://sspcmsn.org/yahoo_site_admin/assets/F...
متن کاملVideo Watermarking Algorithm Based on Relative Relationship of DCT Coefficients
A video watermarking algorithm based on relative relationship of DCT coefficients is proposed in this paper. By modification of coefficients on chosen positions, the robustness of watermark embedding is ensured. Meanwhile, as the relationship of coefficients remains unchanged, the quality of video is not affected. The analysis results shows that the performance of proposed algorithm is better t...
متن کامل