#When the river runs dry acoustic drivers#
Riverbed drying can significantly affect sediment microorganisms, crucial drivers of biogeochemical processes in lotic systems. Therefore, it is very essential to take necessary steps through individual and government participation and public awareness to improve the present condition of the Bhairab River.Ĭombined effects of climate change and increasing anthropogenic water demand have increased and extended dry period occurrences in rivers worldwide. The result also revealed 159 and 150 positive approval with respect to human made causes and natural causes, respectively as causes for the river dry, which indicated that the human made causes were relatively more responsible than natural causes for drying up of the Bhairab River. From the study, establishment of dam was observed predominant among human made causes and drought was found strongest among natural causes. Data analysis also showed that 65%, 62%, 60%, 67% and 80% participants favored climate change, siltation, rainfall pattern, temperature and drought, respectively as natural causes for drying up of the Bhairab River. and irresponsible management of fishing, respectively as human made causes for drying up of the Bhairab River. It was found that 47%, 78%, 64%, 64% and 73% respondents supported the installation of dam, establishment of bridge, excessive irrigation in agricultural land, use of chemicals, pesticides, industrial effluents etc.
The data analysis revealed that both of human made causes and natural causes were responsible for river dry. Data were collected through questionnaire interviews and Focus Group Discussion (FGD). Notun Khoyertola, Puratan Koshba Kazipara, Nodagram, Santola, Nurnagar and Bijoy Nagar Villages in Jashore district to identify the causes for drying up of the Bhairab River so that the flow of the river can be continued and kept alive by taking necessary steps. The study was conducted for a period of four months at six selected drying up points of the Bhairab River, viz. Non-perennial rivers and streams are mapped globally, showing that more than half of rivers worldwide experience no flow for at least one day per year.īhairab River is an important river in the moribund delta area of Bangladesh although it is drying up gradually.
By mapping the distribution of non-perennial rivers and streams, we provide a stepping-stone towards addressing this grand challenge in freshwater science. To understand and adequately manage the world’s flowing waters, their biodiversity and functional integrity, a paradigm shift is needed towards a new conceptual model of rivers that includes flow intermittence. Our findings challenge the assumptions underpinning foundational river concepts across scientific disciplines9.
Leveraging global information on the hydrology, climate, geology and surrounding land cover of the Earth’s river network, we show that non-perennial rivers occur within all climates and biomes, and on every continent. Here we predict that water ceases to flow for at least one day per year along 51–60 per cent of the world’s rivers by length, demonstrating that non-perennial rivers and streams are the rule rather than the exception on Earth. This oversight contributes to the degradation of the main source of water and livelihood for millions of people5. Although the importance of permanent watercourses is well recognized, the prevalence, value and fate of non-perennial rivers and streams that periodically cease to flow tend to be overlooked, if not ignored6–8. Flowing waters have a unique role in supporting global biodiversity, biogeochemical cycles and human societies1–5.
0 kommentar(er)
