### Abstract

The river regime laws of the hydraulic properties of the cross sections of two hydrological stations (Dua and Yen Thuong) along the Ca River in north-central Vietnam were combined into power functions with exponents of 1.46–1.85 using the Manning roughness coefficient and the settling velocity or the particle size to simulate the suspended sediment load. The Nash–Sutcliffe efficiency, percent bias, and the ratio of the root-mean-square error to the standard deviation of the measured data were used to evaluate the calibration process for the pre-dam period (1994–2004) and for validation for the post-dam period (2005–2014). Effects of dam construction include a change in the relationship between the Manning roughness coefficient and sediment particle size. The observed sediment load decreased by approximately 20–40% after dam construction at both stations. We used a power function with exponents of 0.968 and 0.992 for the dissolved solid load to calculate the long-term annual total dissolved solids at the Dua and Yen Thuong stations, respectively. After dam construction, the average value of the total suspended solids–total dissolved solids ratio decreased from 3.0 to 2.3 at the Dua station and from 4.1 to 2.2 at the Yen Thuong station.

Original language | English |
---|---|

Article number | 398 |

Journal | Environmental Earth Sciences |

Volume | 78 |

Issue number | 14 |

DOIs | |

Publication status | Published - Jul 1 2019 |

### Fingerprint

### Keywords

- Ca River
- Dissolved solids
- Regime laws
- Sediment transport
- Suspended solids
- Total solids

### ASJC Scopus subject areas

- Global and Planetary Change
- Environmental Chemistry
- Water Science and Technology
- Soil Science
- Pollution
- Geology
- Earth-Surface Processes

### Cite this

*Environmental Earth Sciences*,

*78*(14), [398]. https://doi.org/10.1007/s12665-019-8394-x

**Effects of dam construction on total solids in the Ca River, north-central Vietnam.** / Phuong, Ho Thi; Okubo, Kenji.

Research output: Contribution to journal › Article

*Environmental Earth Sciences*, vol. 78, no. 14, 398. https://doi.org/10.1007/s12665-019-8394-x

}

TY - JOUR

T1 - Effects of dam construction on total solids in the Ca River, north-central Vietnam

AU - Phuong, Ho Thi

AU - Okubo, Kenji

PY - 2019/7/1

Y1 - 2019/7/1

N2 - The river regime laws of the hydraulic properties of the cross sections of two hydrological stations (Dua and Yen Thuong) along the Ca River in north-central Vietnam were combined into power functions with exponents of 1.46–1.85 using the Manning roughness coefficient and the settling velocity or the particle size to simulate the suspended sediment load. The Nash–Sutcliffe efficiency, percent bias, and the ratio of the root-mean-square error to the standard deviation of the measured data were used to evaluate the calibration process for the pre-dam period (1994–2004) and for validation for the post-dam period (2005–2014). Effects of dam construction include a change in the relationship between the Manning roughness coefficient and sediment particle size. The observed sediment load decreased by approximately 20–40% after dam construction at both stations. We used a power function with exponents of 0.968 and 0.992 for the dissolved solid load to calculate the long-term annual total dissolved solids at the Dua and Yen Thuong stations, respectively. After dam construction, the average value of the total suspended solids–total dissolved solids ratio decreased from 3.0 to 2.3 at the Dua station and from 4.1 to 2.2 at the Yen Thuong station.

AB - The river regime laws of the hydraulic properties of the cross sections of two hydrological stations (Dua and Yen Thuong) along the Ca River in north-central Vietnam were combined into power functions with exponents of 1.46–1.85 using the Manning roughness coefficient and the settling velocity or the particle size to simulate the suspended sediment load. The Nash–Sutcliffe efficiency, percent bias, and the ratio of the root-mean-square error to the standard deviation of the measured data were used to evaluate the calibration process for the pre-dam period (1994–2004) and for validation for the post-dam period (2005–2014). Effects of dam construction include a change in the relationship between the Manning roughness coefficient and sediment particle size. The observed sediment load decreased by approximately 20–40% after dam construction at both stations. We used a power function with exponents of 0.968 and 0.992 for the dissolved solid load to calculate the long-term annual total dissolved solids at the Dua and Yen Thuong stations, respectively. After dam construction, the average value of the total suspended solids–total dissolved solids ratio decreased from 3.0 to 2.3 at the Dua station and from 4.1 to 2.2 at the Yen Thuong station.

KW - Ca River

KW - Dissolved solids

KW - Regime laws

KW - Sediment transport

KW - Suspended solids

KW - Total solids

UR - http://www.scopus.com/inward/record.url?scp=85068880987&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85068880987&partnerID=8YFLogxK

U2 - 10.1007/s12665-019-8394-x

DO - 10.1007/s12665-019-8394-x

M3 - Article

AN - SCOPUS:85068880987

VL - 78

JO - Environmental Earth Sciences

JF - Environmental Earth Sciences

SN - 1866-6280

IS - 14

M1 - 398

ER -