Water loss due to evaporation from open reservoirs under weather conditions in Vietnam

Abstract

Water reservoirs play a significant role in agricultural irrigation systems in Vietnam. It is necessary to quantify and monitor the water storage levels in reservoirs on a timely basis in order to properly forecast the water supply for the local agriculture. For this reason, the amount of water loss due to evaporation at the open surface should be properly quantified. This study evaluated different evaporation models in the literature using published experimental data to select an appropriate model for calculating the evaporation rate at the free water surface under the local weather conditions in Da Nang city and Quang Nam province of Vietnam. Water loss calculations were made for a number of major reservoirs in these two regions, which are located in a tropical monsoon climate region of Vietnam. The results show that water loss for a typical dry day is 11.31 mm/day, whereas it is 6.82 mm/day for a typical rainy day. Estimations of the water loss per day calculated for different reservoirs that may be useful for the agricultural irrigation system management board. The results reported in this study may also benefit the future designs of the irrigation reservoirs.

Problematic Power: A Perspective on the Role of Small Hydropower in Energy Transitions in Vietnam

“…Collectively, the situation in these northern catchments reflects what we argue is extensive and unsustainable river disruption to produce limited power generation. From a water balance perspective, at many steps along the cascade of HPFs on the tributaries of the Hong River, water is lost through evaporation, which is estimated to range from ∼7 to 11 mm per day depending on climate regime and water variables such as depth and surface area . Losses via infiltration are largely unknown.…”

“…From a water balance perspective, at many steps along the cascade of HPFs on the tributaries of the Hong River, water is lost through evaporation, which is estimated to range from ∼7 to 11 mm per day depending on climate regime and water variables such as depth and surface area. 44 Losses via infiltration are largely unknown. At the same time, the increasing unpredictability of extreme rainfall events challenges efficient HPF operations.…”

Reducing Evaporation from Arid Soil in Jordan Through Absorbent Materials: Volcanic Tuff, Wood Ash, and Date Pit Ash

“…It is essential for conserving water, especially in arid regions with limited water resources. Evaporation increases as the humidity drops, the air warms, or the wind strengthens [1]. Several methods are traditionally used in order to reduce evaporation from the soil, such as organic mulch [2,3], cover crops [4,5], reduced tillage [6,7], drip irrigation [8,9], and evaporation suppressants [10,11].…”

Learning from hydrological and hydrogeological problems in civil engineering. Study of reservoirs in Andalusia, Spain

“…However, the most abundant cases are those of poor-functioning infrastructures owing to the geological and hydrological conditions. The main deficiencies in these large dams are related to water contamination/degradation (Jalali et al, 2019;Peng et al, 2020); leakage from the impoundment structure (Turkmen et al, 2002;De Waele, 2008;Dong et al, 2016;Shangxin et al, 2020); severe environmental and hydrogeological impacts on the natural system that compel to change the initial hydrological plans (Micklin, 2011), or the inability to store the resource due to high direct evaporation from the surface (Nguyen et al, 2020).…”