FIELD MEASUREMENT OF SALINE WATER INTRUSION IN LAKE OGAWARA
| Autor: | Hirokazu Fujiwara, Yasushi Tsuruta, Mai Narita, Shuzo Nishida, Tadaharu Ishikawa |
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| Rok vydání: | 2001 |
| Předmět: | |
| Zdroj: | PROCEEDINGS OF HYDRAULIC ENGINEERING. 45:1165-1170 |
| ISSN: | 1884-9172 0916-7374 |
| DOI: | 10.2208/prohe.45.1165 |
| Popis: | Field measurements were carried out on the flow field caused by seawater intrusion in a shallow water area near the outlet of the Lake Ogawara. 64 thermometers and 6 salinity meters were placed in the area for six days. First, a correlation between the temperature increment and the salinity was investigated with an expectation that the behavior of the intruding saline water could be estimated by the temperature data because the seawater temperature was lower than the lake water temperature in the period of the measurements. The results show that the expectation was realistic for the rising tide phase but not for the sinking tide phase. A series of detailed contour maps of salinity are obtained for the rising tide phase from the temperature data analysis. The maps clearly show that the saline water spreads widely over the shallow water area although it goes up the waterway along the north shore of the lake just at the beginning of an intrusion event. The salinity data obtained at several points show that high salinity water tends to stay for over ten hours at the bottom of the shallow area after the lake water starts to outflow at the sinking tide phase. |
| Databáze: | OpenAIRE |
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