Simulating water and salt movement in tile-drained fields irrigated with saline water under a Serial Biological Concentration management scenario

Taken Hongwei test field in the He Tao irrigation area of Inner Mongolia for research example, soil water and salt movement model system in regional unsaturated zone is established and tested, through the method of regional zoning. Detection results indicate that the calculated results from the model system agree well with the measured data. It is concluded that simulating and forecasting soil water and salt movement in regional unsaturated zone with this model system is feasible and authentic.

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Modeling and Management Option Analysis for Saline Groundwater Drainage in a Deltaic Island

Sustainability ◽

10.3390/su13126784 ◽

2021 ◽

Vol 13 (12) ◽

pp. 6784

Author(s):

Renji Remesan ◽

Arjun Prabhakaran ◽

Macariush N. Sangma ◽

Sreekanth Janardhanan ◽

Mohammed Mainuddin ◽

...

Keyword(s):

Surface Water ◽

Root Zone ◽

Saline Water ◽

Monsoon Season ◽

Current Status ◽

Saline Groundwater ◽

Management Scenario ◽

Scenario Analyses ◽

Water Logging ◽

Modeling Study

Understanding the interactions between shallow saline groundwater and surface water is crucial for managing water logging in deltaic islands. Water logging conditions result in the accumulation of salt in the root zone of crops and detrimentally affect agriculture in the economically and socially backward deltaic region of West Bengal and Bangladesh. In this paper, we undertook a modeling study of surface water–groundwater interactions in the Gosaba Island of Sundarbans region of the Ganges delta using MODFLOW followed by comprehensive parameter sensitivity analysis. Further, scenario analyses (i.e., no-drain, single drain, three drains) were undertaken to evaluate the effectiveness of drainage infrastructure to reduce saline water logging conditions. The evaluation indicated that installation of three drains can remove water at a rate of up to −123.3 m3day−1 and lower the water table up to 0.4 m. The single drain management scenario could divert water at the rate of −77.9 m3day−1 during post monsoon season, lowering the shallow saline groundwater table up to 0.1 m. This preliminary modeling study shows encouraging results to consider drainage management as to solve the increasing challenge of water logging and salinity management in the deltaic region. The insights will be useful for farmers and policymakers in the region for planning various sustainable saline groundwater management. Building drainage infrastructure could potentially be part of initiatives like the national employment guarantee scheme in India. In the future, this model can be coupled with solute transport models for understanding the current status and future expansion of salinity in the study area. Further modeling and optimization analysis can help identify the optimal depth and spacing of drains.

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Limnological characteristics, community metabolism and management strategies of a coastal sinkhole in Cuba (Cenote Jennifer)

Annales de Limnologie - International Journal of Limnology ◽

10.1051/limn/2020022 ◽

2020 ◽

Vol 56 ◽

pp. 24

Author(s):

Roberto González-De Zayas ◽

Liosban Lantigua Ponce de León ◽

Liezel Guerra Rodríguez ◽

Felipe Matos Pupo ◽

Leslie Hernández-Fernández

Keyword(s):

Hydrogen Sulfide ◽

Primary Productivity ◽

Major Ions ◽

Saline Water ◽

Management Strategies ◽

Tourist Destination ◽

Community Metabolism ◽

Morphological Studies ◽

Made In ◽

Limnological Parameters

The Cenote Jennifer is an important and unique aquatic sinkhole in Cayo Coco (Jardines del Rey Tourist Destination) that has brackish to saline water. Two samplings were made in 1998 and 2009, and 4 metabolism community experiments in 2009. Some limnological parameters were measured in both samplings (temperature, salinity, pH, dissolved oxygen major ions, hydrogen sulfide, nutrients and others). Community metabolism was measured through incubated oxygen concentration in clear and dark oxygen bottles. Results showed that the sinkhole limnology depends on rainfall and light incidence year, with some stratification episodes, due to halocline or oxycline presence, rather than thermocline. The sinkhole water was oligotrophic (total nitrogen of 41.5 ± 22.2 μmol l−1 and total phosphorus of 0.3 ± 0.2 μmol l−1) and with low productivity (gross primary productivity of 63.0 mg C m−2 d−1). Anoxia and hypoxia were present at the bottom with higher levels of hydrogen sulfide, lower pH and restricted influence of the adjacent sea (2 km away). To protect the Cenote Jennifer, tourist exploitation should be avoided and more resources to ecological and morphological studies should be allocated, and eventually use this aquatic system only for specialized diving. For conservation purposes, illegal garbage disposal in the surrounding forest should end.

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