Advantages And Disadvantages Of Terraced Fields

The Three Gorges Dam is an unfinished project which will be the largest dam ever constructed on the planet Earth. It is situated in China on the third largest river in the world – the Yangtze. The dam has been debated over since the 1919 and is still a hot topic of debate because of its many pros and cons. In 1994 construction began on the dam, and it is expected to be finished by the year 2009. The massive dimensions of the dam are mind boggling and its functions – if the dam actually works – are truly remarkable; however, with such a large structure also comes difficulties, sacrifices, and cynics. The goal of this essay is to lend an understanding of the dam itself, the prospective benefits of

The proper process in restoring wetlands is fundamental to recover some of the lost habitats and biodiversity from our lifestyle. Ensuring this recovery could change our lives. Meanwhile, it is the mentality and innocence about the importance of this topic what doesn’t lead to more restoration of natural habitats. However, changing out the mentality towards nature through education will ensure quality of life for us and the generations yet to come. Throughout this paper we will discover the importance of the tidal wetlands, restorations processes, functions and results from these restorations.

Mountains can have a wet and a dry side. Firstly, In the cordeillan climate region, there is orographic precipitation, which causes the windward side of the mountain to be wet, and the leeward side to be dry. The clouds are forced to travel over the mountain, and then when the water condensates, it falls as rain or snow on the windward side of the mountain. Once the cloud passes over the top of the mountain, it sinks and becomes dry, and creates a rainshadow on the leeward side. Secondly, south facing slopes get more sunlight, therefore more plants grow there. For example, vineyards in the Niagara region of Ontario are planted on the south facing slopes of the land. This ensures that the plants gets more sunlight and grow better and faster because south facing slopes are more perpendicular to the sun than north facing. The plants help hold the soil together to protect it from erosion, and then eventually turn into humus after they die. Lastly, steeper slopes have faster moving water from precipitation, therefore more erosion happens to the soil. Steeper slopes of mountains often have water going through them, which moves quickly. This fast moving water erodes away at the soil, and creates deep gulleys, and moves the soil to wherever the stream or river ends. Landform characteristics affect soil

In this paper I will conduct research on the Bolsa Chica Wetlands that are located in an area of lowlands in Orange County California, adjacent to the city of Huntington Beach. The area is managed by the National Marine Fisheries Service (NMFS), whose mission is to” protect and enhance; migratory shorebird, seabird, waterfowl overwintering habitat; protect natural habitat for shorebirds and seabirds; protect nesting and foraging conditions for threatened or endangered species” The Bolsa Chica Conservancy (BCC) is a local volunteer organization that assists in maintaining the area. Its goals are to ensure the preservation, restoration, and enhancement of the area (2010). This

The Three Gorges Dam was not worthy of being constructed. It may be environmentally friendly, yet the sacrifices made in creating it was much more important than the pollutant-free energy it creates. The increasing height of the waters has put numerous people and places at risk; some even already submerged in the tides. Over 100,000 acres of precious farmland was demolished by the rising water, in which was approximately one-third of all of China’s farmable land. The tides also destroyed ancient sites, villages, towns, cities, and much more. Also, it has risked many people’s lives. Due to the dam being built on two fault lines, the risk of earthquakes has skyrocketed. Additionally, if the dam breaks from an earthquake, the water will flow,

The environmental management aims of the dam were to reduce flooding of the river, as well as shifting the nation from heavy coal-dependency to more renewably sourced energy to meet expanding requirements in China. Thus maintaining to expand the energy industry and output for use in a growing society, whilst considering the finite limit and emission impacts of coal and other fossil fuels. To meet these goals, the TGD was constructed to become the world’s largest hydroelectric dam. The Yangtze River on which it built is the world’s third largest river; being the largest in China (Cai et al., 2013). The Yangtze River Basin (including tributaries) involves 20% of the area of China; resultantly being large enough to heavily impact surrounding ecosystems, the water cycle and energy balance (Li et al., 2011). Construction of the dam commenced in 1993 and ended in 2009, with the final construction having a storage capacity of 3.93x1010m3 (Zhou et al., 2014). Partial operation of the dam commenced from 2003 and full operation from 2009 (Cai et al., 2013). Studies have been comprehensively conducted to argue that this technological solution has not led to good management of the environment; as evidenced from both social and environmental impacts, as well as investigations into the overweighing benefits people management would have had.

INTRODUCTION: Water assets building is growing massively today. Dams have the most vital part in using water assets. They were developed taxing year before increasing present data about hydrology and hydro mechanics. All through the historical backdrop of the world, dams have been utilized effectively as a part of gathering, putting away and overseeing water expected to manage human advancement. Dams have a lot of positive and negative impacts on the earth. Their advantages like controlling stream administration, subsequently forestalling surges, getting local and water system water from put away water and creating vitality from hydro control. While dam give noteworthy advantage to our general public, their effect on the encompassing incorporates resettlement and migration, financial effect, natural concerns, sedimentation issue, security angles and so on. Notwithstanding their vital social and natural advantages, it is vital to minimize the negative impacts of the hoover dam on the earth with respect to feasible advancement.

Over the past 50 years, the negative effects of soil erosion on farm productivity have been masked by improved technology and increasing use of fertilizers and pesticides. Ironically, many of these measures used to increase the short-term productivity of American farms are also causing excessive erosion, which threatens productivity over the long term. For example, diminished use of cover crops leaves soils unprotected from wind and rain during much of the year, and increased mechanization has led to use of larger fields without windbreaks or drainage contours.

That is why man has come up with multiple ways of conserving soil. There are four ways of conserving soil. The most of the ways are used by farmers. One way farmers can conserve soil is by cultivating rows of crops sideways on a hill instead of up and down to slow down water flow. This way is called counter plowing. The second way is by building ridges that are similar to steps on a hill to hold in water called terracing and is especially used for growing rice. The third way of conserving soil is by strip cropping. Strip cropping is when someone like a farmer grows a different type of crop on the same piece of land to catch and hold any soil from an older crop. The fourth way is by planting rows of trees close to each other to force the wind to blow upward away from the ground called shelter belt and is very good to use in a windy, flat, bare

The Three Gorges Dam, the world’s largest power station, is a hydroelectric dam that distances the Yangtze River located in China. Dams could be built for many reasons, including flood control, irrigation, and sedimentation control. Construction for the dam started in 1992 after many repeated discussions and arguments took place. The Chinese people are keeping a close watch on the Three Gorges Dam, and many people in other countries are keeping an eye on it as well. Unfortunately, with a project as big as this, many problems come along with it. The Chinese government dismissed many warnings from environmentalists that said that the project has the potential of being, “one of China’s biggest environmental nightmares” (Hvistendahl).

Water scarcity, the global critical issue cause increasing environmental stress, and it affects the ecosystem. In order to solve the water scarcity problem, huge dam construction causes interception of river flow, and it is endangering the dependent creatures. The study estimated 24% of mammals, 12% of birds, and 10% of freshwater fish types are endangered (“Water security”, 2010).

It takes up to three hundred years for one inch of agricultural topsoil to form so soil that is lost is essentially irreplaceable. The consequences for long-term crop yields have not been sufficiently measured. The amount of erosion varies from one field to another. This depends on the type of soil, the slope of the field, the drainage patterns and the crop management practices. The effects of the erosion vary also. The areas that are better able to sustain erosion without loss of productivity are areas with deep organic loams. This is more sustainable than the areas where topsoil’s are shallower.

The country’s water challenge, while universally felt, does vary from region to region. While freshwater resources are concentrated in the southern and western regions of China, the reforms of the 1980’s resulted in rapid growth of urban clusters in the eastern and northern regions, resulting in water use being uneven across the country. The growing Chinese cities rely on groundwater, which is being overexploited by the increasingly dense population. China’s agricultural needs also present a substantial drain on the country’s water resources. China’s land

Soil erosion may be a slow process that continues relatively unnoticed, or it may occur at an alarming rate causing serious loss of topsoil. The loss of soil from farmland may be reflected in reduced crop production potential, lower surface water quality

A study was conducted in farmers’ fields of Rai block of Sonepat district, Haryana, India to study the long term impact of two widely adopted resource conservation technologies (RCT’s) namely bed planting and zero tillage on structural properties of soils of recent alluvial plains of the river Yamuna. Aggregate mean weight diameter by dry sieving and wet sieving (DS-MWD and WS-MWD) under different RCT’s were studied to compare structural condition of the soils under continuous use of these technologies. Other important structural indices such as dispersion ratio (a measure of ease of dispersion; DR), colloid moisture equivalent ration (a measure of ease of percolation; CMER), erosion ratio (ER), stability index (SI), soil organic carbon (SOC), clay ratio (CR) were also studied to monitor the susceptibility of soil to erosion in the study area. Results revealed that in the surveyed villages under conventional tillage (CT), the mean (of 6 samples) magnitude of DR and ER were 0.58 and 0.82, respectively, and CMER was <1, which indicated the erodible nature of these soils. Analysis of data of bed and conventional systems revealed that on an average, there was about 19.08 % increase in SOC in bed planted system compared to conventional system. The decrease of DR, ER and CR from 0.66, 0.52 and 4.25 under CT to 0.42, 0.28 and 2.38 under beds indicated reduced eroding tendency of these soils under bed planting. Comparison of soil data of ZT and CT showed improvement (33.19