The surface water in the southern of Hanoi capital is researched by identifying δ<sup>2</sup>H and δ<sup>18</sup>O stable isotopes together with EC, DO, BOD<sub>5</sub>, COD, TSS....The surface water in the southern of Hanoi capital is researched by identifying δ<sup>2</sup>H and δ<sup>18</sup>O stable isotopes together with EC, DO, BOD<sub>5</sub>, COD, TSS. Surface water samples for studying include the Red river, Nhue river and Kim Nguu river, Thanh Nhan lake, Yen So lake and Van Quan lake were collected in the dry season (April) and the rainy season (August) in 2015. The stable isotope analysis results showed that the δ<sup>18</sup>O values is a range from -42.53‰ to -64.05‰ and, the δ<sup>2</sup>H values is the range from -5.09‰ to -8.79‰ under global meteoric waterline (in the water vapor region). The δ<sup>2</sup>H results of the rivers and lakes in the dry season are more negative than the rainy season with a small difference. The δ<sup>18</sup>O results of lakes in the dry season are more negative than the rainy season, but the δ<sup>18</sup>O results of river in the dry season are more positive than the rainy season. The results of the EC, BOD, COD, DO, TSS analysis showed that surface water environment has changed clearly in the two seasons and the contamination level in the dry season is usually higher than the rainy season. The lakes and rivers strongly influenced by human activities led to seriously pollution are Van Quan lake and Yen So lake, Nhue river and Kim Nguu river.展开更多
The δ<sup>18</sup>O and δ<sup>2</sup>H stable isotope techniques for studying properties of groundwater and surface help us to understand more clearly about the distribution and movement of g...The δ<sup>18</sup>O and δ<sup>2</sup>H stable isotope techniques for studying properties of groundwater and surface help us to understand more clearly about the distribution and movement of groundwater in the South of Hanoi area. There were 68 water samples from the studying area and analyzed by a Liquid Water Isotope Analyzer (LWIA-24D). The stable isotope values of the groundwater from Pleistocene aquifers were range from -3.21‰ to -9.55‰ δ<sup>18</sup>O and -35.32‰ to -67.44‰ δ<sup>2</sup>H;rainwater from -8.18‰ to -4.13‰ δ18O and -61.19‰ to -17.93‰ δ<sup>2</sup>H;Red river water from -7.51‰ to -5.29‰ δ<sup>18</sup>O and -51.60‰ to -38.99‰ δ<sup>2</sup>H. Based on stable isotope characteristics, the results show that there was a relationship between surface water and groundwater in the South of Hanoi city. It is that groundwater recharges for river water in the dry season with 74%, and in the rainfall season groundwater is recharged from river with 87%.展开更多
文摘The surface water in the southern of Hanoi capital is researched by identifying δ<sup>2</sup>H and δ<sup>18</sup>O stable isotopes together with EC, DO, BOD<sub>5</sub>, COD, TSS. Surface water samples for studying include the Red river, Nhue river and Kim Nguu river, Thanh Nhan lake, Yen So lake and Van Quan lake were collected in the dry season (April) and the rainy season (August) in 2015. The stable isotope analysis results showed that the δ<sup>18</sup>O values is a range from -42.53‰ to -64.05‰ and, the δ<sup>2</sup>H values is the range from -5.09‰ to -8.79‰ under global meteoric waterline (in the water vapor region). The δ<sup>2</sup>H results of the rivers and lakes in the dry season are more negative than the rainy season with a small difference. The δ<sup>18</sup>O results of lakes in the dry season are more negative than the rainy season, but the δ<sup>18</sup>O results of river in the dry season are more positive than the rainy season. The results of the EC, BOD, COD, DO, TSS analysis showed that surface water environment has changed clearly in the two seasons and the contamination level in the dry season is usually higher than the rainy season. The lakes and rivers strongly influenced by human activities led to seriously pollution are Van Quan lake and Yen So lake, Nhue river and Kim Nguu river.
文摘The δ<sup>18</sup>O and δ<sup>2</sup>H stable isotope techniques for studying properties of groundwater and surface help us to understand more clearly about the distribution and movement of groundwater in the South of Hanoi area. There were 68 water samples from the studying area and analyzed by a Liquid Water Isotope Analyzer (LWIA-24D). The stable isotope values of the groundwater from Pleistocene aquifers were range from -3.21‰ to -9.55‰ δ<sup>18</sup>O and -35.32‰ to -67.44‰ δ<sup>2</sup>H;rainwater from -8.18‰ to -4.13‰ δ18O and -61.19‰ to -17.93‰ δ<sup>2</sup>H;Red river water from -7.51‰ to -5.29‰ δ<sup>18</sup>O and -51.60‰ to -38.99‰ δ<sup>2</sup>H. Based on stable isotope characteristics, the results show that there was a relationship between surface water and groundwater in the South of Hanoi city. It is that groundwater recharges for river water in the dry season with 74%, and in the rainfall season groundwater is recharged from river with 87%.
